On ThunderX systems with certain memory configurations we see the
following BUG_ON():
kernel BUG at mm/page_alloc.c:1848!
This happens for some configs with 64k page size enabled. The BUG_ON()
checks if start and end page of a memmap range belongs to the same
zone.
The BUG_ON() check fails if a memory zone contains NOMAP regions. In
this case the node information of those pages is not initialized. This
causes an inconsistency of the page links with wrong zone and node
information for that pages. NOMAP pages from node 1 still point to the
mem zone from node 0 and have the wrong nid assigned.
The reason for the mis-configuration is a change in pfn_valid() which
reports pages marked NOMAP as invalid:
68709f45385a arm64: only consider memblocks with NOMAP cleared for linear mapping
This causes pages marked as nomap being no longer reassigned to the
new zone in memmap_init_zone() by calling __init_single_pfn().
Fixing this by implementing an arm64 specific early_pfn_valid(). This
causes the whole mem range including NOMAP memory to be initialized by
__init_single_page() and ensures consistency of page links to zone,
node and section.
The HAVE_ARCH_PFN_VALID config option now requires an explicit
definiton of early_pfn_valid() in the same way as pfn_valid(). This
allows a customized implementation of early_pfn_valid() which
redirects to memblock_is_memory() for arm64.
Signed-off-by: Robert Richter <[email protected]>
---
arch/arm/include/asm/page.h | 1 +
arch/arm64/include/asm/page.h | 2 ++
arch/arm64/mm/init.c | 12 ++++++++++++
include/linux/mmzone.h | 5 ++++-
4 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/arch/arm/include/asm/page.h b/arch/arm/include/asm/page.h
index 4355f0ec44d6..79761bd55f94 100644
--- a/arch/arm/include/asm/page.h
+++ b/arch/arm/include/asm/page.h
@@ -158,6 +158,7 @@ typedef struct page *pgtable_t;
#ifdef CONFIG_HAVE_ARCH_PFN_VALID
extern int pfn_valid(unsigned long);
+#define early_pfn_valid(pfn) pfn_valid(pfn)
#endif
#include <asm/memory.h>
diff --git a/arch/arm64/include/asm/page.h b/arch/arm64/include/asm/page.h
index 8472c6def5ef..17ceb7435ded 100644
--- a/arch/arm64/include/asm/page.h
+++ b/arch/arm64/include/asm/page.h
@@ -49,6 +49,8 @@ typedef struct page *pgtable_t;
#ifdef CONFIG_HAVE_ARCH_PFN_VALID
extern int pfn_valid(unsigned long);
+extern int early_pfn_valid(unsigned long);
+#define early_pfn_valid early_pfn_valid
#endif
#include <asm/memory.h>
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 212c4d1e2f26..fbc136533472 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -145,11 +145,23 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max)
#endif /* CONFIG_NUMA */
#ifdef CONFIG_HAVE_ARCH_PFN_VALID
+
int pfn_valid(unsigned long pfn)
{
return memblock_is_map_memory(pfn << PAGE_SHIFT);
}
EXPORT_SYMBOL(pfn_valid);
+
+/*
+ * We use memblock_is_memory() here to make sure all pages including
+ * NOMAP ranges are initialized with __init_single_page().
+ */
+int early_pfn_valid(unsigned long pfn)
+{
+ return memblock_is_memory(pfn << PAGE_SHIFT);
+}
+EXPORT_SYMBOL(early_pfn_valid);
+
#endif
#ifndef CONFIG_SPARSEMEM
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 0f088f3a2fed..bedcf8a95881 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -1170,12 +1170,16 @@ static inline struct mem_section *__pfn_to_section(unsigned long pfn)
}
#ifndef CONFIG_HAVE_ARCH_PFN_VALID
+
static inline int pfn_valid(unsigned long pfn)
{
if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS)
return 0;
return valid_section(__nr_to_section(pfn_to_section_nr(pfn)));
}
+
+#define early_pfn_valid(pfn) pfn_valid(pfn)
+
#endif
static inline int pfn_present(unsigned long pfn)
@@ -1200,7 +1204,6 @@ static inline int pfn_present(unsigned long pfn)
#define pfn_to_nid(pfn) (0)
#endif
-#define early_pfn_valid(pfn) pfn_valid(pfn)
void sparse_init(void);
#else
#define sparse_init() do {} while (0)
--
2.1.4
On Fri, Dec 09, 2016 at 07:10:41PM +0100, Robert Richter wrote:
> On ThunderX systems with certain memory configurations we see the
> following BUG_ON():
>
> kernel BUG at mm/page_alloc.c:1848!
>
> This happens for some configs with 64k page size enabled. The BUG_ON()
> checks if start and end page of a memmap range belongs to the same
> zone.
>
> The BUG_ON() check fails if a memory zone contains NOMAP regions. In
> this case the node information of those pages is not initialized. This
> causes an inconsistency of the page links with wrong zone and node
> information for that pages. NOMAP pages from node 1 still point to the
> mem zone from node 0 and have the wrong nid assigned.
>
> The reason for the mis-configuration is a change in pfn_valid() which
> reports pages marked NOMAP as invalid:
>
> 68709f45385a arm64: only consider memblocks with NOMAP cleared for linear mapping
>
> This causes pages marked as nomap being no longer reassigned to the
> new zone in memmap_init_zone() by calling __init_single_pfn().
>
> Fixing this by implementing an arm64 specific early_pfn_valid(). This
> causes the whole mem range including NOMAP memory to be initialized by
> __init_single_page() and ensures consistency of page links to zone,
> node and section.
>
> The HAVE_ARCH_PFN_VALID config option now requires an explicit
> definiton of early_pfn_valid() in the same way as pfn_valid(). This
> allows a customized implementation of early_pfn_valid() which
> redirects to memblock_is_memory() for arm64.
>
> Signed-off-by: Robert Richter <[email protected]>
Acked-by: Russell King <[email protected]>
Thanks.
> ---
> arch/arm/include/asm/page.h | 1 +
> arch/arm64/include/asm/page.h | 2 ++
> arch/arm64/mm/init.c | 12 ++++++++++++
> include/linux/mmzone.h | 5 ++++-
> 4 files changed, 19 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/include/asm/page.h b/arch/arm/include/asm/page.h
> index 4355f0ec44d6..79761bd55f94 100644
> --- a/arch/arm/include/asm/page.h
> +++ b/arch/arm/include/asm/page.h
> @@ -158,6 +158,7 @@ typedef struct page *pgtable_t;
>
> #ifdef CONFIG_HAVE_ARCH_PFN_VALID
> extern int pfn_valid(unsigned long);
> +#define early_pfn_valid(pfn) pfn_valid(pfn)
> #endif
>
> #include <asm/memory.h>
> diff --git a/arch/arm64/include/asm/page.h b/arch/arm64/include/asm/page.h
> index 8472c6def5ef..17ceb7435ded 100644
> --- a/arch/arm64/include/asm/page.h
> +++ b/arch/arm64/include/asm/page.h
> @@ -49,6 +49,8 @@ typedef struct page *pgtable_t;
>
> #ifdef CONFIG_HAVE_ARCH_PFN_VALID
> extern int pfn_valid(unsigned long);
> +extern int early_pfn_valid(unsigned long);
> +#define early_pfn_valid early_pfn_valid
> #endif
>
> #include <asm/memory.h>
> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> index 212c4d1e2f26..fbc136533472 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -145,11 +145,23 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max)
> #endif /* CONFIG_NUMA */
>
> #ifdef CONFIG_HAVE_ARCH_PFN_VALID
> +
> int pfn_valid(unsigned long pfn)
> {
> return memblock_is_map_memory(pfn << PAGE_SHIFT);
> }
> EXPORT_SYMBOL(pfn_valid);
> +
> +/*
> + * We use memblock_is_memory() here to make sure all pages including
> + * NOMAP ranges are initialized with __init_single_page().
> + */
> +int early_pfn_valid(unsigned long pfn)
> +{
> + return memblock_is_memory(pfn << PAGE_SHIFT);
> +}
> +EXPORT_SYMBOL(early_pfn_valid);
> +
> #endif
>
> #ifndef CONFIG_SPARSEMEM
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index 0f088f3a2fed..bedcf8a95881 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -1170,12 +1170,16 @@ static inline struct mem_section *__pfn_to_section(unsigned long pfn)
> }
>
> #ifndef CONFIG_HAVE_ARCH_PFN_VALID
> +
> static inline int pfn_valid(unsigned long pfn)
> {
> if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS)
> return 0;
> return valid_section(__nr_to_section(pfn_to_section_nr(pfn)));
> }
> +
> +#define early_pfn_valid(pfn) pfn_valid(pfn)
> +
> #endif
>
> static inline int pfn_present(unsigned long pfn)
> @@ -1200,7 +1204,6 @@ static inline int pfn_present(unsigned long pfn)
> #define pfn_to_nid(pfn) (0)
> #endif
>
> -#define early_pfn_valid(pfn) pfn_valid(pfn)
> void sparse_init(void);
> #else
> #define sparse_init() do {} while (0)
> --
> 2.1.4
>
--
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
according to speedtest.net.
hi Robert,
On 2016/12/10 2:10, Robert Richter wrote:
> On ThunderX systems with certain memory configurations we see the
> following BUG_ON():
>
> kernel BUG at mm/page_alloc.c:1848!
>
> This happens for some configs with 64k page size enabled. The BUG_ON()
> checks if start and end page of a memmap range belongs to the same
> zone.
>
> The BUG_ON() check fails if a memory zone contains NOMAP regions. In
> this case the node information of those pages is not initialized. This
> causes an inconsistency of the page links with wrong zone and node
> information for that pages. NOMAP pages from node 1 still point to the
> mem zone from node 0 and have the wrong nid assigned.
>
The patch can work for zone contains NOMAP regions.
However, if BIOS do not add WB/WT/WC attribute to a physical address range, the
is_memory(md) will return false and this range will not be added to memblock.
efi_init
-> reserve_regions
if (is_memory(md)) {
early_init_dt_add_memory_arch(paddr, size);
if (!is_usable_memory(md))
memblock_mark_nomap(paddr, size);
}
Then BUG_ON() check will also fails. Any idea about it?
Here is the crash log I got from D05:
crash log---------------
[ 0.000000] Booting Linux on physical CPU 0x10000
[ 0.000000] Linux version 4.9.0-rc8+ (xys@linux-ibm) (gcc version 6.1.1 20160711 (Linaro GCC 6.1-2016.08) ) #61 SMP Fri Dec 9 19:46:24 CST 2016
[ 0.000000] Boot CPU: AArch64 Processor [410fd082]
[ 0.000000] earlycon: pl11 at MMIO32 0x00000000602b0000 (options '')
[ 0.000000] bootconsole [pl11] enabled
[ 0.000000] efi: Getting EFI parameters from FDT:
[ 0.000000] efi: System Table: 0x000000003f150018
[ 0.000000] efi: MemMap Address: 0x0000000031b33018
[ 0.000000] efi: MemMap Size: 0x000009f0
[ 0.000000] efi: MemMap Desc. Size: 0x00000030
[ 0.000000] efi: MemMap Desc. Version: 0x00000001
[ 0.000000] efi: EFI v2.60 by EDK II
[ 0.000000] efi: SMBIOS=0x3f130000 SMBIOS 3.0=0x39ca0000 ACPI=0x39d70000 ACPI 2.0=0x39d70014 MEMATTR=0x3ce14018
[ 0.000000] efi: Processing EFI memory map:
[ 0.000000] MEMBLOCK configuration:
[ 0.000000] memory size = 0x0 reserved size = 0x1000
[ 0.000000] memory.cnt = 0x1
[ 0.000000] memory[0x0] [0x00000000000000-0xffffffffffffffff], 0x0 bytes on node 0 flags: 0x0
[ 0.000000] reserved.cnt = 0x1
[ 0.000000] reserved[0x0] [0x0000001e400000-0x0000001e400fff], 0x1000 bytes flags: 0x0
[ 0.000000] efi: 0x000000000000-0x00000007ffff [Conventional Memory| | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000000000000-0x0000000007ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x000000080000-0x0000016cffff [Loader Data | | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000000080000-0x000000016cffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x0000016d0000-0x00001e3fffff [Conventional Memory| | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x000000016d0000-0x0000001e3fffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00001e400000-0x00001e40ffff [Loader Data | | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x0000001e400000-0x0000001e40ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00001e410000-0x00001e47ffff [Conventional Memory| | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x0000001e410000-0x0000001e47ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00001e480000-0x00001fffffff [Loader Data | | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x0000001e480000-0x0000001fffffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x000020000000-0x00002fbfffff [Conventional Memory| | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000020000000-0x0000002fbfffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00002fc00000-0x00002fc1ffff [Boot Data | | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x0000002fc00000-0x0000002fc1ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00002fc20000-0x00003049cfff [Conventional Memory| | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x0000002fc20000-0x0000003049ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00003049d000-0x000031b0ffff [Loader Code | | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000030490000-0x00000031b0ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x000031b10000-0x000031b2ffff [Runtime Data |RUN| | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000031b10000-0x00000031b2ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x000031b30000-0x000031b32fff [Conventional Memory| | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000031b30000-0x00000031b3ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x000031b33000-0x000031b33fff [Loader Data | | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000031b30000-0x00000031b3ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x000031b34000-0x000031b37fff [Reserved | | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000031b30000-0x00000031b3ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x000031b38000-0x000031baefff [Boot Code | | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000031b30000-0x00000031baffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x000031baf000-0x000039baffff [Boot Data | | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000031ba0000-0x00000039baffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x000039bb0000-0x000039beffff [Runtime Code |RUN| | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000039bb0000-0x00000039beffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x000039bf0000-0x000039c3ffff [ACPI Reclaim Memory| | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000039bf0000-0x00000039c3ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x000039c40000-0x000039c4ffff [ACPI Memory NVS | | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000039c40000-0x00000039c4ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x000039c50000-0x000039c8ffff [ACPI Reclaim Memory| | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000039c50000-0x00000039c8ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x000039c90000-0x000039d0ffff [Runtime Data |RUN| | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000039c90000-0x00000039d0ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x000039d10000-0x000039d5ffff [Runtime Code |RUN| | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000039d10000-0x00000039d5ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x000039d60000-0x000039d7ffff [ACPI Reclaim Memory| | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000039d60000-0x00000039d7ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x000039d80000-0x000039dcffff [Runtime Data |RUN| | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000039d80000-0x00000039dcffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x000039dd0000-0x000039e1ffff [Runtime Code |RUN| | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000039dd0000-0x00000039e1ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x000039e20000-0x000039e6ffff [Runtime Data |RUN| | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000039e20000-0x00000039e6ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x000039e70000-0x000039f3ffff [Runtime Code |RUN| | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000039e70000-0x00000039f3ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x000039f40000-0x000039faffff [Runtime Data |RUN| | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000039f40000-0x00000039faffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x000039fb0000-0x000039ffffff [Runtime Code |RUN| | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00000039fb0000-0x00000039ffffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00003a000000-0x00003a04ffff [Runtime Data |RUN| | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x0000003a000000-0x0000003a04ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00003a050000-0x00003a09ffff [Runtime Code |RUN| | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x0000003a050000-0x0000003a09ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00003a0a0000-0x00003a0effff [Runtime Data |RUN| | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x0000003a0a0000-0x0000003a0effff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00003a0f0000-0x00003a13ffff [Runtime Code |RUN| | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x0000003a0f0000-0x0000003a13ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00003a140000-0x00003a140fff [Loader Data | | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x0000003a140000-0x0000003a14ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00003a141000-0x00003a14bfff [Boot Code | | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x0000003a140000-0x0000003a14ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00003a14c000-0x00003c31dfff [Conventional Memory| | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x0000003a140000-0x0000003c31ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00003c31e000-0x00003cdcdfff [Boot Data | | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x0000003c310000-0x0000003cdcffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00003cdce000-0x00003cdfdfff [Conventional Memory| | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x0000003cdc0000-0x0000003cdfffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00003cdfe000-0x00003ef7ffff [Boot Data | | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x0000003cdf0000-0x0000003ef7ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00003ef80000-0x00003ef81fff [Conventional Memory| | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x0000003ef80000-0x0000003ef8ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00003ef82000-0x00003f10ffff [Boot Code | | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x0000003ef80000-0x0000003f10ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00003f110000-0x00003f12ffff [Conventional Memory| | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x0000003f110000-0x0000003f12ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00003f130000-0x00003f15ffff [Runtime Data |RUN| | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x0000003f130000-0x0000003f15ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00003f160000-0x00003f16ffff [Conventional Memory| | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x0000003f160000-0x0000003f16ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00003f170000-0x00003fbfffff [Boot Data | | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x0000003f170000-0x0000003fbfffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x00003fc00000-0x00003fffffff [Reserved | | | | | | | | | | | | ]
[ 0.000000] efi: 0x000078000000-0x00007800ffff [Memory Mapped I/O |RUN| | | | | | | | | | |UC]
[ 0.000000] efi: 0x0000a4000000-0x0000a4ffffff [Memory Mapped I/O |RUN| | | | | | | | | | |UC]
[ 0.000000] efi: 0x0000a6000000-0x0000a600ffff [Memory Mapped I/O |RUN| | | | | | | | | | |UC]
[ 0.000000] efi: 0x0000d00e0000-0x0000d00effff [Memory Mapped I/O |RUN| | | | | | | | | | |UC]
[ 0.000000] efi: 0x001040000000-0x0013fbffffff [Conventional Memory| | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00001040000000-0x000013fbffffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x041000000000-0x0413fbfeffff [Conventional Memory| | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x00041000000000-0x000413fbfeffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] efi: 0x0413fbff0000-0x0413fbffffff [Loader Data | | | | | | | | |WB|WT|WC|UC]
[ 0.000000] memblock_add: [0x000413fbff0000-0x000413fbffffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[ 0.000000] memblock_reserve: [0x0000003ce14018-0x0000003ce14657] flags 0x0 efi_memattr_init+0x8c/0xa8
[ 0.000000] memblock_reserve: [0x00000031b30000-0x00000031b3ffff] flags 0x0 efi_init+0xa8/0x148
[ 0.000000] memblock_add: [0x0000001e480000-0x0000001fffffff] flags 0x0 arm64_memblock_init+0x16c/0x248
[ 0.000000] memblock_reserve: [0x0000001e480000-0x0000001fffffff] flags 0x0 arm64_memblock_init+0x178/0x248
[ 0.000000] memblock_reserve: [0x00000000080000-0x000000016cffff] flags 0x0 arm64_memblock_init+0x1b0/0x248
[ 0.000000] memblock_reserve: [0x0000001e480000-0x0000001fffdc62] flags 0x0 arm64_memblock_init+0x1cc/0x248
[ 0.000000] cma: Failed to reserve 512 MiB
[ 0.000000] memblock_reserve: [0x000013fbff0000-0x000013fbffffff] flags 0x0 memblock_alloc_range_nid+0x30/0x48
[ 0.000000] memblock_reserve: [0x000013fbfe0000-0x000013fbfeffff] flags 0x0 memblock_alloc_range_nid+0x30/0x48
[ 0.000000] memblock_reserve: [0x000013fbfd0000-0x000013fbfdffff] flags 0x0 memblock_alloc_range_nid+0x30/0x48
[ 0.000000] memblock_reserve: [0x000013fbfc0000-0x000013fbfcffff] flags 0x0 memblock_alloc_range_nid+0x30/0x48
[ 0.000000] memblock_reserve: [0x000013fbfb0000-0x000013fbfbffff] flags 0x0 memblock_alloc_range_nid+0x30/0x48
[ 0.000000] memblock_free: [0x000013fbff0000-0x000013fbffffff] paging_init+0x65c/0x6ac
[ 0.000000] memblock_free: [0x000000016c0000-0x000000016cffff] paging_init+0x690/0x6ac
[...]
[ 0.000000] Zone ranges:
[ 0.000000] DMA [mem 0x0000000000000000-0x00000000ffffffff]
[ 0.000000] Normal [mem 0x0000000100000000-0x00000013fbffffff]
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 1: [mem 0x0000000000000000-0x000000000001ffff]
[ 0.000000] node 1: [mem 0x0000000000030000-0x0000000031b0ffff]
[ 0.000000] node 1: [mem 0x0000000031b10000-0x0000000031b3ffff]
[ 0.000000] node 1: [mem 0x0000000031b40000-0x0000000039baffff]
[ 0.000000] node 1: [mem 0x0000000039bb0000-0x000000003a13ffff]
[ 0.000000] node 1: [mem 0x000000003a140000-0x000000003f12ffff]
[ 0.000000] node 1: [mem 0x000000003f130000-0x000000003f15ffff]
[ 0.000000] node 1: [mem 0x000000003f160000-0x000000003fbfffff]
[ 0.000000] node 1: [mem 0x0000001040000000-0x00000013fbffffff]
[ 0.000000] Could not find start_pfn for node 0
[ 0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000000000000]
[ 0.000000] Initmem setup node 1 [mem 0x0000000000000000-0x00000013fbffffff]
[ 0.000000] Could not find start_pfn for node 2
[ 0.000000] Initmem setup node 2 [mem 0x0000000000000000-0x0000000000000000]
[ 0.000000] Could not find start_pfn for node 3
[ 0.000000] Initmem setup node 3 [mem 0x0000000000000000-0x0000000000000000]
[ 0.000000] MEMBLOCK configuration:
[ 0.000000] memory size = 0x3fbc00000 reserved size = 0x42a7cc0
[ 0.000000] memory.cnt = 0x9
[ 0.000000] memory[0x0] [0x00000000000000-0x000000000257ff], 0x25800 bytes on node 1 flags: 0x4
[ 0.000000] memory[0x1] [0x00000000025800-0x00000031b0ffff], 0x31aea800 bytes on node 1 flags: 0x0
[ 0.000000] memory[0x2] [0x00000031b10000-0x00000031b3ffff], 0x30000 bytes on node 1 flags: 0x4
[ 0.000000] memory[0x3] [0x00000031b40000-0x00000039baffff], 0x8070000 bytes on node 1 flags: 0x0
[ 0.000000] memory[0x4] [0x00000039bb0000-0x0000003a13ffff], 0x590000 bytes on node 1 flags: 0x4
[ 0.000000] memory[0x5] [0x0000003a140000-0x0000003f12ffff], 0x4ff0000 bytes on node 1 flags: 0x0
[ 0.000000] memory[0x6] [0x0000003f130000-0x0000003f15ffff], 0x30000 bytes on node 1 flags: 0x4
[ 0.000000] memory[0x7] [0x0000003f160000-0x0000003fbfffff], 0xaa0000 bytes on node 1 flags: 0x0
[ 0.000000] memory[0x8] [0x00001040000000-0x000013fbffffff], 0x3bc000000 bytes on node 1 flags: 0x0
[ 0.000000] reserved.cnt = 0x8
[ 0.000000] reserved[0x0] [0x00000000080000-0x000000016bffff], 0x1640000 bytes flags: 0x0
[ 0.000000] reserved[0x1] [0x0000001e400000-0x0000001e400fff], 0x1000 bytes flags: 0x0
[ 0.000000] reserved[0x2] [0x0000001e480000-0x0000001fffffff], 0x1b80000 bytes flags: 0x0
[ 0.000000] reserved[0x3] [0x00000031b30000-0x00000031b3ffff], 0x10000 bytes flags: 0x0
[ 0.000000] reserved[0x4] [0x0000003ce14018-0x0000003ce14657], 0x640 bytes flags: 0x0
[ 0.000000] reserved[0x5] [0x000013fad20000-0x000013fbd2ffff], 0x1010000 bytes flags: 0x0
[ 0.000000] reserved[0x6] [0x000013fbf37380-0x000013fbfeffff], 0xb8c80 bytes flags: 0x0
[ 0.000000] reserved[0x7] [0x000013fbff2600-0x000013fbffffff], 0xda00 bytes flags: 0x0
[ 0.000000] memblock_reserve: [0x0000003fbfff80-0x0000003fbfffbf] flags 0x0 __alloc_memory_core_early+0x9c/0xe4
[ 0.000000] memblock_reserve: [0x0000003fbfff00-0x0000003fbfff3f] flags 0x0 __alloc_memory_core_early+0x9c/0xe4
[ 0.000000] memblock_reserve: [0x0000003fbffe80-0x0000003fbffebf] flags 0x0 __alloc_memory_core_early+0x9c/0xe4
[ 0.000000] memblock_reserve: [0x0000003fbffe00-0x0000003fbffe3f] flags 0x0 __alloc_memory_core_early+0x9c/0xe4
[ 0.000000] memblock_reserve: [0x0000003fbffd80-0x0000003fbffdbf] flags 0x0 __alloc_memory_core_early+0x9c/0xe4
[ 0.000000] memblock_reserve: [0x0000003fbffd00-0x0000003fbffd3f] flags 0x0 __alloc_memory_core_early+0x9c/0xe4
[ 0.000000] memblock_reserve: [0x0000003fbffc80-0x0000003fbffcbf] flags 0x0 __alloc_memory_core_early+0x9c/0xe4
[ 0.000000] memblock_reserve: [0x0000003fbffc00-0x0000003fbffc3f] flags 0x0 __alloc_memory_core_early+0x9c/0xe4
[ 0.000000] memblock_reserve: [0x0000003fbffb80-0x0000003fbffbbf] flags 0x0 __alloc_memory_core_early+0x9c/0xe4
[...]
[ 5.081443] move_freepages: start_page info: zonenum = 0, nid = 1, pfn = 8192, valid = 1, phys = 0x20000000
[ 5.081443] move_freepages: end_page info: zonenum = 0, nid = 0, pfn = 16383, valid = 0, phys = 0x3fff0000
[ 5.091280] ------------[ cut here ]------------
[ 5.095971] kernel BUG at mm/page_alloc.c:1871! ----> is mm/page_alloc.c:1863! without add debug log.
[ 5.100576] Internal error: Oops - BUG: 0 [#1] SMP
[ 5.105446] Modules linked in:
[ 5.108552] CPU: 61 PID: 1 Comm: swapper/0 Not tainted 4.9.0-rc8+ #61
[ 5.115101] Hardware name: Huawei Taishan 2280 /D05, BIOS Hisilicon D05 UEFI 16.08 RC1 12/08/2016
[ 5.124126] task: fffffe13f23d1700 task.stack: fffffe13f66a0000
[ 5.130157] PC is at move_freepages+0x280/0x288
[ 5.134764] LR is at move_freepages+0x23c/0x288
[ 5.139365] pc : [<fffffc00081e9698>] lr : [<fffffc00081e9654>] pstate: 200000c5
[ 5.146889] sp : fffffe13f66a38d0
[ 5.150253] x29: fffffe13f66a38f0 x28: fffffdff80000000
[ 5.155652] x27: 0000000000003fff x26: 0000000000002000
[ 5.161051] x25: 0000000000000000 x24: 0000000000000000
[ 5.166453] x23: 0000000000000001 x22: fffffc0008e12328
[ 5.171851] x21: fffffdff800fffc0 x20: fffffe13fbf62680
[ 5.177251] x19: fffffdff80080000 x18: 0000000000000010
[ 5.182652] x17: 0000000000000000 x16: 0000000000000000
[ 5.188053] x15: 0000000000000006 x14: 702c29302c312864
[ 5.193455] x13: 696c61762c293338 x12: 3336312c32393138
[ 5.198854] x11: 286e66702c29302c x10: 0000000000000559
[ 5.204258] x9 : 000000000000006e x8 : 302c303030303030
[ 5.209663] x7 : 3032783028737968 x6 : fffffe13fbff2680
[ 5.215068] x5 : 0000000000000001 x4 : fffffe13fbf62680
[ 5.220468] x3 : 0000000000000000 x2 : 0000000000000000
[ 5.225870] x1 : fffffe13fbff2680 x0 : fffffe13fbf62680
[...]
[ 5.793294] [<fffffc00081e9698>] move_freepages+0x280/0x288
[ 5.798964] [<fffffc00081e9748>] move_freepages_block+0xa8/0xb8
[ 5.804994] [<fffffc00081e9cc4>] __rmqueue+0x494/0x5f0
[ 5.810225] [<fffffc00081eb214>] get_page_from_freelist+0x5ec/0xb58
[ 5.816603] [<fffffc00081ebd54>] __alloc_pages_nodemask+0x144/0xd08
[ 5.822979] [<fffffc000824061c>] alloc_page_interleave+0x64/0xc0
[ 5.829092] [<fffffc0008240c28>] alloc_pages_current+0x108/0x168
[ 5.835207] [<fffffc0008c75410>] atomic_pool_init+0x78/0x1cc
[ 5.840970] [<fffffc0008c755a0>] arm64_dma_init+0x3c/0x44
[ 5.846471] [<fffffc0008082d94>] do_one_initcall+0x44/0x138
[ 5.852143] [<fffffc0008c70d54>] kernel_init_freeable+0x1ec/0x28c
[ 5.858351] [<fffffc00088a7af0>] kernel_init+0x18/0x110
[ 5.863665] [<fffffc0008082b30>] ret_from_fork+0x10/0x20
[ 5.869078] Code: 8b001c80 8b011cc1 eb00003f 54fff080 (d4210000)
[ 5.875318] ---[ end trace b723f6d3d3b4c326 ]---
[ 5.880038] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
[ 5.880038]
[ 5.889340] SMP: stopping secondary CPUs
[ 5.893339] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
hi Robert,
On 2016/12/12 11:12, Yisheng Xie wrote:
> hi Robert,
>
> On 2016/12/10 2:10, Robert Richter wrote:
>> On ThunderX systems with certain memory configurations we see the
>> following BUG_ON():
>>
>> kernel BUG at mm/page_alloc.c:1848!
>>
>> This happens for some configs with 64k page size enabled. The BUG_ON()
>> checks if start and end page of a memmap range belongs to the same
>> zone.
>>
>> The BUG_ON() check fails if a memory zone contains NOMAP regions. In
>> this case the node information of those pages is not initialized. This
>> causes an inconsistency of the page links with wrong zone and node
>> information for that pages. NOMAP pages from node 1 still point to the
>> mem zone from node 0 and have the wrong nid assigned.
>>
> The patch can work for zone contains NOMAP regions.
>
> However, if BIOS do not add WB/WT/WC attribute to a physical address range, the
> is_memory(md) will return false and this range will not be added to memblock.
> efi_init
> -> reserve_regions
> if (is_memory(md)) {
> early_init_dt_add_memory_arch(paddr, size);
>
> if (!is_usable_memory(md))
> memblock_mark_nomap(paddr, size);
> }
>
> Then BUG_ON() check will also fails. Any idea about it?
>
It seems that memblock_is_memory() is also too strict for early_pfn_valid,
so what about this patch, which use common pfn_valid as early_pfn_valid
when CONFIG_HAVE_ARCH_PFN_VALID=y:
------------
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 0f088f3..9d596f3 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -1200,7 +1200,17 @@ static inline int pfn_present(unsigned long pfn)
#define pfn_to_nid(pfn) (0)
#endif
+#ifdef CONFIG_HAVE_ARCH_PFN_VALID
+static inline int early_pfn_valid(unsigned long pfn)
+{
+ if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS)
+ return 0;
+ return valid_section(__nr_to_section(pfn_to_section_nr(pfn)));
+}
+#define early_pfn_valid early_pfn_valid
+#else
#define early_pfn_valid(pfn) pfn_valid(pfn)
+#endif
void sparse_init(void);
#else
#define sparse_init() do {} while (0)
On 12.12.16 17:53:02, Yisheng Xie wrote:
> It seems that memblock_is_memory() is also too strict for early_pfn_valid,
> so what about this patch, which use common pfn_valid as early_pfn_valid
> when CONFIG_HAVE_ARCH_PFN_VALID=y:
> ------------
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index 0f088f3..9d596f3 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -1200,7 +1200,17 @@ static inline int pfn_present(unsigned long pfn)
> #define pfn_to_nid(pfn) (0)
> #endif
>
> +#ifdef CONFIG_HAVE_ARCH_PFN_VALID
> +static inline int early_pfn_valid(unsigned long pfn)
> +{
> + if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS)
> + return 0;
> + return valid_section(__nr_to_section(pfn_to_section_nr(pfn)));
> +}
I sent a V2 patch that uses pfn_present(). This only initilizes
sections with memory.
-Robert
> +#define early_pfn_valid early_pfn_valid
> +#else
> #define early_pfn_valid(pfn) pfn_valid(pfn)
> +#endif
> void sparse_init(void);
> #else
> #define sparse_init() do {} while (0)
>
>
>
hi Robert,
On 2016/12/14 17:45, Robert Richter wrote:
> On 12.12.16 17:53:02, Yisheng Xie wrote:
>> It seems that memblock_is_memory() is also too strict for early_pfn_valid,
>> so what about this patch, which use common pfn_valid as early_pfn_valid
>> when CONFIG_HAVE_ARCH_PFN_VALID=y:
>> ------------
>> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
>> index 0f088f3..9d596f3 100644
>> --- a/include/linux/mmzone.h
>> +++ b/include/linux/mmzone.h
>> @@ -1200,7 +1200,17 @@ static inline int pfn_present(unsigned long pfn)
>> #define pfn_to_nid(pfn) (0)
>> #endif
>>
>> +#ifdef CONFIG_HAVE_ARCH_PFN_VALID
>> +static inline int early_pfn_valid(unsigned long pfn)
>> +{
>> + if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS)
>> + return 0;
>> + return valid_section(__nr_to_section(pfn_to_section_nr(pfn)));
>> +}
>
> I sent a V2 patch that uses pfn_present(). This only initilizes
> sections with memory.
hmm， maybe I do not quite catch what your mean, but I do not think
pfn_present is right for this case.
IMO, The valid_section() means the section with mem_map, not section with memory.
And:
pfn_present
-> present_section
which means the section is present but may not have mem_map, so it may not
have page struct at all for that section.
Please let me know, if I miss anything.
Thanks,
Yisheng Xie.
>
> -Robert
>
>> +#define early_pfn_valid early_pfn_valid
>> +#else
>> #define early_pfn_valid(pfn) pfn_valid(pfn)
>> +#endif
>> void sparse_init(void);
>> #else
>> #define sparse_init() do {} while (0)
>>
>>
>>
>
>
On 15.12.16 11:01:04, Yisheng Xie wrote:
> > I sent a V2 patch that uses pfn_present(). This only initilizes
> > sections with memory.
> hmm， maybe I do not quite catch what your mean, but I do not think
> pfn_present is right for this case.
>
> IMO, The valid_section() means the section with mem_map, not section with memory.
Right, the section may be uninitialized with the present flag only.
valid_section() is better, this is also the pfn_valid() default
implementation.
Will rework. Thanks.
-Robert