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riscv: mm: ptep_get_and_clear(): avoid atomic ops when !CONFIG_SMP

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When !CONFIG_SMP, there's no need for atomic operations in
ptep_get_and_clear(), so, similar to x86, let's not use atomics in
this case.

Cc: Alexandre Ghiti <alex@ghiti.fr>
Signed-off-by: Paul Walmsley <pjw@kernel.org>
This commit is contained in:
Paul Walmsley
2025-11-17 21:19:27 -07:00
parent 1e6084d5c4
commit 425cc087fb
1 changed files with 6 additions and 0 deletions
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6
arch/riscv/include/asm/pgtable.h
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@@ -660,7 +660,13 @@ extern int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long a
static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
unsigned long address, pte_t *ptep)
{
#ifdef CONFIG_SMP
pte_t pte = __pte(atomic_long_xchg((atomic_long_t *)ptep, 0));
#else
pte_t pte = *ptep;
set_pte(ptep, __pte(0));
#endif
page_table_check_pte_clear(mm, pte);