Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752424AbbKKJvX (ORCPT ); Wed, 11 Nov 2015 04:51:23 -0500 Received: from mail.skyhub.de ([78.46.96.112]:58008 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751386AbbKKJvS (ORCPT ); Wed, 11 Nov 2015 04:51:18 -0500 Date: Wed, 11 Nov 2015 10:51:01 +0100 From: Borislav Petkov To: "Kirill A. Shutemov" Cc: "Kirill A. Shutemov" , hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, x86@kernel.org, jgross@suse.com, konrad.wilk@oracle.com, elliott@hpe.com, boris.ostrovsky@oracle.com, Toshi Kani Subject: Re: [PATCH] x86/mm: fix regression with huge pages on PAE Message-ID: <20151111095101.GA22512@pd.tnic> References: <1447111090-8526-1-git-send-email-kirill.shutemov@linux.intel.com> <20151110123429.GE19187@pd.tnic> <20151110135303.GA11246@node.shutemov.name> <20151110144648.GG19187@pd.tnic> <20151110150713.GA11956@node.shutemov.name> <20151110170447.GH19187@pd.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20151110170447.GH19187@pd.tnic> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6668 Lines: 196 On Tue, Nov 10, 2015 at 06:04:47PM +0100, Borislav Petkov wrote: > On Tue, Nov 10, 2015 at 05:07:13PM +0200, Kirill A. Shutemov wrote: > > Yeah. Looks good to me. > > It gets even cleaner. Let me run it through the *config build tests. Hohumm, it passes. Here's what I ended up committing: --- From: "Kirill A. Shutemov" Date: Tue, 10 Nov 2015 01:18:10 +0200 Subject: [PATCH] x86/mm: Fix regression with huge pages on PAE MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Recent PAT patchset has caused issue on 32-bit PAE machines: page:eea45000 count:0 mapcount:-128 mapping: (null) index:0x0 flags: 0x40000000() page dumped because: VM_BUG_ON_PAGE(page_mapcount(page) < 0) ------------[ cut here ]------------ kernel BUG at /home/build/linux-boris/mm/huge_memory.c:1485! invalid opcode: 0000 [#1] SMP Modules linked in: ahci libahci ata_generic skge r8169 firewire_ohci mii libata qla2xxx(+) scsi_transport_fc scsi_mod radeon tpm_infineon ttm backlight wmi acpi_cpufreq tpm_tis CPU: 2 PID: 1758 Comm: modprobe Not tainted 4.3.0upstream-09269-gce5c2d2 #1 Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./To be filled by O.E.M., BIOS 080014 07/18/2008 task: ed84e600 ti: f6458000 task.ti: f6458000 EIP: 0060:[] EFLAGS: 00010246 CPU: 2 EIP is at zap_huge_pmd+0x240/0x260 EAX: 00000000 EBX: f6459eb0 ECX: 00000292 EDX: 00000292 ESI: f6634d98 EDI: eea45000 EBP: f6459dc8 ESP: f6459d98 ata1: SATA link down (SStatus 0 SControl 300) ata2: SATA link down (SStatus 0 SControl 300) DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 CR0: 8005003b CR2: b75b21a0 CR3: 3655b880 CR4: 000006f0 Stack: ... Call Trace: unmap_single_vma ? __wake_up unmap_vmas unmap_region do_munmap vm_munmap SyS_munmap do_fast_syscall_32 ? __do_page_fault sysenter_past_esp Code: 00 e9 05 fe ff ff 90 8d 74 26 00 0f 0b eb fe ba 4c e1 7a c1 89 f8 e8 f0 91 fd ff 0f 0b eb fe ba 6c e1 7a c1 89 f8 e8 e0 91 fd ff <0f> 0b eb fe ba c4 e1 7a c1 89 f8 e8 d0 91 fd ff 0f 0b eb fe 8d EIP: [] zap_huge_pmd+0x240/0x260 SS:ESP 0068:f6459d98 ---[ end trace cba8fb1fc2e2e78a ]--- The problem is in pmd_pfn_mask() and pmd_flags_mask(). These helpers use PMD_PAGE_MASK to calculate resulting mask. PMD_PAGE_MASK is 'unsigned long', not 'unsigned long long' as phys_addr_t. As result upper bits of resulting mask is truncated. The patch reworks code to use PMD_SHIFT as base of mask calculation instead of PMD_PAGE_MASK. pud_pfn_mask() and pud_flags_mask() aren't problematic since we don't have PUD page table level on 32-bit systems, but they are reworked too to be consistent with PMD counterpart. Reported-and-Tested-by: Boris Ostrovsky Signed-off-by: Kirill A. Shutemov Reviewed-by: Toshi Kani Cc: Andrew Morton Cc: elliott@hpe.com Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: Jürgen Gross Cc: konrad.wilk@oracle.com Cc: linux-mm Cc: Mel Gorman Cc: Thomas Gleixner Fixes: f70abb0fc3da ("x86/asm: Fix pud/pmd interfaces to handle large PAT bit") Link: http://lkml.kernel.org/r/1447111090-8526-1-git-send-email-kirill.shutemov@linux.intel.com [ Fix -Woverflow warnings from the realmode code. ] Signed-off-by: Borislav Petkov --- arch/x86/boot/boot.h | 1 - arch/x86/boot/video-mode.c | 2 ++ arch/x86/boot/video.c | 2 ++ arch/x86/include/asm/pgtable_types.h | 14 ++++---------- arch/x86/include/asm/x86_init.h | 1 - 5 files changed, 8 insertions(+), 12 deletions(-) diff --git a/arch/x86/boot/boot.h b/arch/x86/boot/boot.h index 0033e96c3f09..9011a88353de 100644 --- a/arch/x86/boot/boot.h +++ b/arch/x86/boot/boot.h @@ -23,7 +23,6 @@ #include #include #include -#include #include #include "bitops.h" #include "ctype.h" diff --git a/arch/x86/boot/video-mode.c b/arch/x86/boot/video-mode.c index aa8a96b052e3..95c7a818c0ed 100644 --- a/arch/x86/boot/video-mode.c +++ b/arch/x86/boot/video-mode.c @@ -19,6 +19,8 @@ #include "video.h" #include "vesa.h" +#include + /* * Common variables */ diff --git a/arch/x86/boot/video.c b/arch/x86/boot/video.c index 05111bb8d018..77780e386e9b 100644 --- a/arch/x86/boot/video.c +++ b/arch/x86/boot/video.c @@ -13,6 +13,8 @@ * Select video mode */ +#include + #include "boot.h" #include "video.h" #include "vesa.h" diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h index dd5b0aa9dd2f..c1e797266ce9 100644 --- a/arch/x86/include/asm/pgtable_types.h +++ b/arch/x86/include/asm/pgtable_types.h @@ -279,17 +279,14 @@ static inline pmdval_t native_pmd_val(pmd_t pmd) static inline pudval_t pud_pfn_mask(pud_t pud) { if (native_pud_val(pud) & _PAGE_PSE) - return PUD_PAGE_MASK & PHYSICAL_PAGE_MASK; + return ~((1ULL << PUD_SHIFT) - 1) & PHYSICAL_PAGE_MASK; else return PTE_PFN_MASK; } static inline pudval_t pud_flags_mask(pud_t pud) { - if (native_pud_val(pud) & _PAGE_PSE) - return ~(PUD_PAGE_MASK & (pudval_t)PHYSICAL_PAGE_MASK); - else - return ~PTE_PFN_MASK; + return ~pud_pfn_mask(pud); } static inline pudval_t pud_flags(pud_t pud) @@ -300,17 +297,14 @@ static inline pudval_t pud_flags(pud_t pud) static inline pmdval_t pmd_pfn_mask(pmd_t pmd) { if (native_pmd_val(pmd) & _PAGE_PSE) - return PMD_PAGE_MASK & PHYSICAL_PAGE_MASK; + return ~((1ULL << PMD_SHIFT) - 1) & PHYSICAL_PAGE_MASK; else return PTE_PFN_MASK; } static inline pmdval_t pmd_flags_mask(pmd_t pmd) { - if (native_pmd_val(pmd) & _PAGE_PSE) - return ~(PMD_PAGE_MASK & (pmdval_t)PHYSICAL_PAGE_MASK); - else - return ~PTE_PFN_MASK; + return ~pmd_pfn_mask(pmd); } static inline pmdval_t pmd_flags(pmd_t pmd) diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h index 48d34d28f5a6..cd0fc0cc78bc 100644 --- a/arch/x86/include/asm/x86_init.h +++ b/arch/x86/include/asm/x86_init.h @@ -1,7 +1,6 @@ #ifndef _ASM_X86_PLATFORM_H #define _ASM_X86_PLATFORM_H -#include #include struct mpc_bus; -- 2.3.5 -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/