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| author | Ryan Roberts <ryan.roberts@arm.com> | 2024-02-15 10:31:54 +0000 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-02-22 15:27:18 -0800 |
| commit | 532736558e8ef2865eae1d84b52dda4422cac810 (patch) | |
| tree | a85feaafec8ca27b2ca8fdcf2686ccef16b11ce0 /arch/arm64/mm/kasan_init.c | |
| parent | fb23bf6bd288db3187c27b971e558a3e9f70ae96 (diff) | |
| download | lwn-532736558e8ef2865eae1d84b52dda4422cac810.tar.gz lwn-532736558e8ef2865eae1d84b52dda4422cac810.zip | |
arm64/mm: convert READ_ONCE(*ptep) to ptep_get(ptep)
There are a number of places in the arch code that read a pte by using the
READ_ONCE() macro. Refactor these call sites to instead use the
ptep_get() helper, which itself is a READ_ONCE(). Generated code should
be the same.
This will benefit us when we shortly introduce the transparent contpte
support. In this case, ptep_get() will become more complex so we now have
all the code abstracted through it.
Link: https://lkml.kernel.org/r/20240215103205.2607016-8-ryan.roberts@arm.com
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Tested-by: John Hubbard <jhubbard@nvidia.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Barry Song <21cnbao@gmail.com>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Morse <james.morse@arm.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'arch/arm64/mm/kasan_init.c')
| -rw-r--r-- | arch/arm64/mm/kasan_init.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c index 4c7ad574b946..c2a9f4f6c7dd 100644 --- a/arch/arm64/mm/kasan_init.c +++ b/arch/arm64/mm/kasan_init.c @@ -113,7 +113,7 @@ static void __init kasan_pte_populate(pmd_t *pmdp, unsigned long addr, memset(__va(page_phys), KASAN_SHADOW_INIT, PAGE_SIZE); next = addr + PAGE_SIZE; set_pte(ptep, pfn_pte(__phys_to_pfn(page_phys), PAGE_KERNEL)); - } while (ptep++, addr = next, addr != end && pte_none(READ_ONCE(*ptep))); + } while (ptep++, addr = next, addr != end && pte_none(ptep_get(ptep))); } static void __init kasan_pmd_populate(pud_t *pudp, unsigned long addr, |