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arm64: Do not mask out PTE_RDONLY in pte_same() 

Following commit 73e86cb03c ("arm64: Move PTE_RDONLY bit handling out
of set_pte_at()"), the PTE_RDONLY bit is no longer managed by
set_pte_at() but built into the PAGE_* attribute definitions.
Consequently, pte_same() must include this bit when checking two PTEs
for equality.

Remove the arm64-specific pte_same() function, practically reverting
commit 747a70e60b ("arm64: Fix copy-on-write referencing in HugeTLB")

Fixes: 73e86cb03c ("arm64: Move PTE_RDONLY bit handling out of set_pte_at()")
Cc: <stable@vger.kernel.org> # 4.14.x-
Cc: Will Deacon <will@kernel.org>
Cc: Steve Capper <steve.capper@arm.com>
Reported-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Catalin Marinas 2019-11-06 15:41:05 +00:00 committed by Will Deacon
parent 1cf45b8fdb
commit 6767df245f
1 changed files with 0 additions and 17 deletions
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17
arch/arm64/include/asm/pgtable.h
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@ -283,23 +283,6 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
set_pte(ptep, pte);
}
#define __HAVE_ARCH_PTE_SAME
static inline int pte_same(pte_t pte_a, pte_t pte_b)
{
pteval_t lhs, rhs;
lhs = pte_val(pte_a);
rhs = pte_val(pte_b);
if (pte_present(pte_a))
lhs &= ~PTE_RDONLY;
if (pte_present(pte_b))
rhs &= ~PTE_RDONLY;
return (lhs == rhs);
}
/*
* Huge pte definitions.
*/