The patch titled
Subject: arm64/mm: drop __HAVE_ARCH_HUGE_PTEP_GET
has been added to the -mm tree. Its filename is
arm64-mm-drop-__have_arch_huge_ptep_get.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/arm64-mm-drop-__have_arch_huge_ptep_get.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/arm64-mm-drop-__have_arch_huge_ptep_get.patch
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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Subject: arm64/mm: drop __HAVE_ARCH_HUGE_PTEP_GET
Patch series "mm/hugetlb: Add some new generic fallbacks", v3.
This series adds the following new generic fallbacks. Before that it
drops __HAVE_ARCH_HUGE_PTEP_GET from arm64 platform.
1. is_hugepage_only_range()
2. arch_clear_hugepage_flags()
After this arm (32 bit) remains the sole platform defining it's own
huge_ptep_get() via __HAVE_ARCH_HUGE_PTEP_GET.
This patch (of 3):
Platform specific huge_ptep_get() is required only when fetching the huge
PTE involves more than just dereferencing the page table pointer. This is
not the case on arm64 platform. Hence huge_ptep_pte() can be dropped
along with it's __HAVE_ARCH_HUGE_PTEP_GET subscription. Before that, it
updates the generic huge_ptep_get() with READ_ONCE() which will prevent
known page table issues with THP on arm64.
Link: http://lkml.kernel.org/r/1588907271-11920-1-git-send-email-anshuman.khandual@xxxxxxx
Link: http://lkml.kernel.org/r//1506527369-19535-1-git-send-email-will.deacon@xxxxxxx/
Link: http://lkml.kernel.org/r/1588907271-11920-2-git-send-email-anshuman.khandual@xxxxxxx
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Acked-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Helge Deller <deller@xxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "James E.J. Bottomley" <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Palmer Dabbelt <palmer@xxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Paul Walmsley <paul.walmsley@xxxxxxxxxx>
Cc: Rich Felker <dalias@xxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm64/include/asm/hugetlb.h | 6 ------
include/asm-generic/hugetlb.h | 2 +-
2 files changed, 1 insertion(+), 7 deletions(-)
--- a/arch/arm64/include/asm/hugetlb.h~arm64-mm-drop-__have_arch_huge_ptep_get
+++ a/arch/arm64/include/asm/hugetlb.h
@@ -17,12 +17,6 @@
extern bool arch_hugetlb_migration_supported(struct hstate *h);
#endif
-#define __HAVE_ARCH_HUGE_PTEP_GET
-static inline pte_t huge_ptep_get(pte_t *ptep)
-{
- return READ_ONCE(*ptep);
-}
-
static inline int is_hugepage_only_range(struct mm_struct *mm,
unsigned long addr, unsigned long len)
{
--- a/include/asm-generic/hugetlb.h~arm64-mm-drop-__have_arch_huge_ptep_get
+++ a/include/asm-generic/hugetlb.h
@@ -122,7 +122,7 @@ static inline int huge_ptep_set_access_f
#ifndef __HAVE_ARCH_HUGE_PTEP_GET
static inline pte_t huge_ptep_get(pte_t *ptep)
{
- return *ptep;
+ return READ_ONCE(*ptep);
}
#endif
_
Patches currently in -mm which might be from anshuman.khandual@xxxxxxx are
arm64-mm-drop-__have_arch_huge_ptep_get.patch
mm-hugetlb-define-a-generic-fallback-for-is_hugepage_only_range.patch
mm-hugetlb-define-a-generic-fallback-for-arch_clear_hugepage_flags.patch
powerpc-mm-drop-platform-defined-pmd_mknotpresent.patch
mm-thp-rename-pmd_mknotpresent-as-pmd_mknotvalid.patch
mm-thp-rename-pmd_mknotpresent-as-pmd_mkinvalid-v2.patch
x86-mm-define-mm_p4d_folded.patch
mm-debug-add-tests-validating-architecture-page-table-helpers.patch
mm-debug-add-tests-validating-architecture-page-table-helpers-v17.patch
mm-debug-add-tests-validating-architecture-page-table-helpers-v18.patch
