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From: Robert Richter <rrichter@amd.com>
To: "Rafael J. Wysocki" <rafael@kernel.org>, Thomas Gleixner
	<tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, Borislav Petkov
	<bp@alien8.de>, Dave Hansen <dave.hansen@linux.intel.com>, <x86@kernel.org>
CC: Dan Williams <dan.j.williams@intel.com>, Alison Schofield
	<alison.schofield@intel.com>, <linux-acpi@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <linux-cxl@vger.kernel.org>, Robert Richter
	<rrichter@amd.com>, "H. Peter Anvin" <hpa@zytor.com>, Len Brown
	<lenb@kernel.org>
Subject: [PATCH v4 2/7] x86/numa: Remove numa_fill_memblks() from sparsemem.h using __weak
Date: Wed, 24 Apr 2024 17:48:41 +0200
Message-ID: <20240424154846.2152750-3-rrichter@amd.com>
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From Dan:

It just feels like numa_fill_memblks() has absolutely no business being
defined in arch/x86/include/asm/sparsemem.h.

The only use for numa_fill_memblks() is to arrange for NUMA nodes to be
applied to memory ranges hot-onlined by the CXL driver.

It belongs right next to numa_add_memblk(), and I suspect
arch/x86/include/asm/sparsemem.h was only chosen to avoid figuring out
what to do about the fact that linux/numa.h does not include asm/numa.h
and that all implementations either provide numa_add_memblk() or select
the generic implementation.

So I would prefer that this do the proper fix and get
numa_fill_memblks() completely out of the sparsemem.h path.

Something like the following which boots for me.

Suggested-by: Dan Williams <dan.j.williams@intel.com>
Link: https://lore.kernel.org/all/66271b0072317_69102944c@dwillia2-xfh.jf.intel.com.notmuch/
Signed-off-by: Robert Richter <rrichter@amd.com>
---

Authorship can be changed to Dan's if he wants to but that needs his
Signed-off-by.
---
 arch/x86/include/asm/numa.h      | 1 +
 arch/x86/include/asm/sparsemem.h | 2 --
 drivers/acpi/numa/srat.c         | 5 +++++
 include/linux/numa.h             | 7 -------
 4 files changed, 6 insertions(+), 9 deletions(-)

diff --git a/arch/x86/include/asm/numa.h b/arch/x86/include/asm/numa.h
index ef2844d69173..12a93a3466c4 100644
--- a/arch/x86/include/asm/numa.h
+++ b/arch/x86/include/asm/numa.h
@@ -26,6 +26,7 @@ extern s16 __apicid_to_node[MAX_LOCAL_APIC];
 extern nodemask_t numa_nodes_parsed __initdata;
 
 extern int __init numa_add_memblk(int nodeid, u64 start, u64 end);
+extern int __init numa_fill_memblks(u64 start, u64 end);
 extern void __init numa_set_distance(int from, int to, int distance);
 
 static inline void set_apicid_to_node(int apicid, s16 node)
diff --git a/arch/x86/include/asm/sparsemem.h b/arch/x86/include/asm/sparsemem.h
index 1aaa447ef24b..64df897c0ee3 100644
--- a/arch/x86/include/asm/sparsemem.h
+++ b/arch/x86/include/asm/sparsemem.h
@@ -38,8 +38,6 @@ extern int phys_to_target_node(phys_addr_t start);
 extern int memory_add_physaddr_to_nid(u64 start);
 #define memory_add_physaddr_to_nid memory_add_physaddr_to_nid
 #endif
-extern int numa_fill_memblks(u64 start, u64 end);
-#define numa_fill_memblks numa_fill_memblks
 #endif /* __ASSEMBLY__ */
 
 #endif /* _ASM_X86_SPARSEMEM_H */
diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c
index e45e64993c50..3b09fd39eeb4 100644
--- a/drivers/acpi/numa/srat.c
+++ b/drivers/acpi/numa/srat.c
@@ -208,6 +208,11 @@ int __init srat_disabled(void)
 	return acpi_numa < 0;
 }
 
+__weak int __init numa_fill_memblks(u64 start, u64 end)
+{
+	return NUMA_NO_MEMBLK;
+}
+
 #if defined(CONFIG_X86) || defined(CONFIG_ARM64) || defined(CONFIG_LOONGARCH)
 /*
  * Callback for SLIT parsing.  pxm_to_node() returns NUMA_NO_NODE for
diff --git a/include/linux/numa.h b/include/linux/numa.h
index 915033a75731..8485d98e554d 100644
--- a/include/linux/numa.h
+++ b/include/linux/numa.h
@@ -36,13 +36,6 @@ int memory_add_physaddr_to_nid(u64 start);
 int phys_to_target_node(u64 start);
 #endif
 
-#ifndef numa_fill_memblks
-static inline int __init numa_fill_memblks(u64 start, u64 end)
-{
-	return NUMA_NO_MEMBLK;
-}
-#endif
-
 #else /* !CONFIG_NUMA */
 static inline int numa_nearest_node(int node, unsigned int state)
 {
-- 
2.39.2