From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f47.google.com (mail-pa0-f47.google.com [209.85.220.47]) by kanga.kvack.org (Postfix) with ESMTP id 6E8FB6B0258 for ; Fri, 4 Dec 2015 06:50:30 -0500 (EST) Received: by pacwq6 with SMTP id wq6so8770544pac.1 for ; Fri, 04 Dec 2015 03:50:30 -0800 (PST) Received: from terminus.zytor.com (terminus.zytor.com. [2001:1868:205::10]) by mx.google.com with ESMTPS id 28si19069687pfj.63.2015.12.04.03.50.29 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 04 Dec 2015 03:50:29 -0800 (PST) Date: Fri, 4 Dec 2015 03:49:27 -0800 From: "tip-bot for Kirill A. Shutemov" Message-ID: Reply-To: linux-kernel@vger.kernel.org, boris.ostrovsky@oracle.com, bp@alien8.de, hpa@zytor.com, toshi.kani@hpe.com, bp@suse.de, linux-mm@kvack.org, kirill.shutemov@linux.intel.com, dvlasenk@redhat.com, peterz@infradead.org, brgerst@gmail.com, jgross@suse.com, torvalds@linux-foundation.org, akpm@linux-foundation.org, mingo@kernel.org, luto@amacapital.net, tglx@linutronix.de, mgorman@suse.de In-Reply-To: <1448878233-11390-2-git-send-email-bp@alien8.de> References: <1448878233-11390-2-git-send-email-bp@alien8.de> Subject: [tip:x86/urgent] x86/mm: Fix regression with huge pages on PAE MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: owner-linux-mm@kvack.org List-ID: To: linux-tip-commits@vger.kernel.org Cc: mingo@kernel.org, luto@amacapital.net, tglx@linutronix.de, mgorman@suse.de, jgross@suse.com, torvalds@linux-foundation.org, akpm@linux-foundation.org, peterz@infradead.org, dvlasenk@redhat.com, brgerst@gmail.com, boris.ostrovsky@oracle.com, linux-kernel@vger.kernel.org, hpa@zytor.com, bp@alien8.de, bp@suse.de, toshi.kani@hpe.com, kirill.shutemov@linux.intel.com, linux-mm@kvack.org Commit-ID: 70f1528747651b20c7769d3516ade369f9963237 Gitweb: http://git.kernel.org/tip/70f1528747651b20c7769d3516ade369f9963237 Author: Kirill A. Shutemov AuthorDate: Mon, 30 Nov 2015 11:10:33 +0100 Committer: Ingo Molnar CommitDate: Fri, 4 Dec 2015 09:14:27 +0100 x86/mm: Fix regression with huge pages on PAE 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 [...] 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: ... EIP: [] zap_huge_pmd+0x240/0x260 SS:ESP 0068:f6459d98 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 is on 32-bit PAE (ARCH_PHYS_ADDR_T_64BIT). As a result, the upper bits of resulting mask get truncated. pud_pfn_mask() and pud_flags_mask() aren't problematic since we don't have PUD page table level on 32-bit systems, but it's reasonable to keep them consistent with PMD counterpart. Introduce PHYSICAL_PMD_PAGE_MASK and PHYSICAL_PUD_PAGE_MASK in addition to existing PHYSICAL_PAGE_MASK and reworks helpers to use them. Reported-and-Tested-by: Boris Ostrovsky Signed-off-by: Kirill A. Shutemov [ Fix -Woverflow warnings from the realmode code. ] Signed-off-by: Borislav Petkov Reviewed-by: Toshi Kani Cc: Andrew Morton Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: JA 1/4 rgen Gross Cc: Linus Torvalds Cc: Mel Gorman Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: elliott@hpe.com Cc: konrad.wilk@oracle.com Cc: linux-mm Fixes: f70abb0fc3da ("x86/asm: Fix pud/pmd interfaces to handle large PAT bit") Link: http://lkml.kernel.org/r/1448878233-11390-2-git-send-email-bp@alien8.de Signed-off-by: Ingo Molnar Signed-off-by: Ingo Molnar --- arch/x86/boot/boot.h | 1 - arch/x86/boot/video-mode.c | 2 ++ arch/x86/boot/video.c | 2 ++ arch/x86/include/asm/page_types.h | 16 +++++++++------- arch/x86/include/asm/pgtable_types.h | 14 ++++---------- arch/x86/include/asm/x86_init.h | 1 - 6 files changed, 17 insertions(+), 19 deletions(-) diff --git a/arch/x86/boot/boot.h b/arch/x86/boot/boot.h index 0033e96..9011a88 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 aa8a96b..95c7a81 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 05111bb..77780e3 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/page_types.h b/arch/x86/include/asm/page_types.h index c5b7fb2..cc071c6 100644 --- a/arch/x86/include/asm/page_types.h +++ b/arch/x86/include/asm/page_types.h @@ -9,19 +9,21 @@ #define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT) #define PAGE_MASK (~(PAGE_SIZE-1)) +#define PMD_PAGE_SIZE (_AC(1, UL) << PMD_SHIFT) +#define PMD_PAGE_MASK (~(PMD_PAGE_SIZE-1)) + +#define PUD_PAGE_SIZE (_AC(1, UL) << PUD_SHIFT) +#define PUD_PAGE_MASK (~(PUD_PAGE_SIZE-1)) + #define __PHYSICAL_MASK ((phys_addr_t)((1ULL << __PHYSICAL_MASK_SHIFT) - 1)) #define __VIRTUAL_MASK ((1UL << __VIRTUAL_MASK_SHIFT) - 1) -/* Cast PAGE_MASK to a signed type so that it is sign-extended if +/* Cast *PAGE_MASK to a signed type so that it is sign-extended if virtual addresses are 32-bits but physical addresses are larger (ie, 32-bit PAE). */ #define PHYSICAL_PAGE_MASK (((signed long)PAGE_MASK) & __PHYSICAL_MASK) - -#define PMD_PAGE_SIZE (_AC(1, UL) << PMD_SHIFT) -#define PMD_PAGE_MASK (~(PMD_PAGE_SIZE-1)) - -#define PUD_PAGE_SIZE (_AC(1, UL) << PUD_SHIFT) -#define PUD_PAGE_MASK (~(PUD_PAGE_SIZE-1)) +#define PHYSICAL_PMD_PAGE_MASK (((signed long)PMD_PAGE_MASK) & __PHYSICAL_MASK) +#define PHYSICAL_PUD_PAGE_MASK (((signed long)PUD_PAGE_MASK) & __PHYSICAL_MASK) #define HPAGE_SHIFT PMD_SHIFT #define HPAGE_SIZE (_AC(1,UL) << HPAGE_SHIFT) diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h index dd5b0aa..a471cad 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 PHYSICAL_PUD_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 PHYSICAL_PMD_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 48d34d2..cd0fc0c 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; -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. 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