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

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When !CONFIG_SMP, there's no need for atomic operations in
pmdp_huge_get_and_clear(), so, similar to what x86 does, let's not use
atomics in this case.  See also commit 546e42c8c6 ("riscv: Use an
atomic xchg in pudp_huge_get_and_clear()").

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 818d78ba1b
commit 1e6084d5c4
1 changed files with 6 additions and 0 deletions
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6
arch/riscv/include/asm/pgtable.h
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@ -997,7 +997,13 @@ static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
unsigned long address, pmd_t *pmdp)
{
#ifdef CONFIG_SMP
pmd_t pmd = __pmd(atomic_long_xchg((atomic_long_t *)pmdp, 0));
#else
pmd_t pmd = *pmdp;
pmd_clear(pmdp);
#endif
page_table_check_pmd_clear(mm, pmd);