Commit 1e6084d5 authored by Paul Walmsley's avatar Paul Walmsley
Browse files

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



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 546e42c8 ("riscv: Use an
atomic xchg in pudp_huge_get_and_clear()").

Cc: Alexandre Ghiti <alex@ghiti.fr>
Signed-off-by: default avatarPaul Walmsley <pjw@kernel.org>
parent 818d78ba

arch/riscv/include/asm/pgtable.h

+6 −0
Original line number Diff line number Diff line
@@ -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);