Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
riscv: mm: ptep_get_and_clear(): avoid atomic ops when !CONFIG_SMP
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>
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arch/riscv/include/asm/pgtable.h
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arch/riscv/include/asm/pgtable.h
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static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
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unsigned long address, pte_t *ptep)
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{
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#ifdef CONFIG_SMP
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pte_t pte = __pte(atomic_long_xchg((atomic_long_t *)ptep, 0));
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#else
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pte_t pte = *ptep;
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set_pte(ptep, __pte(0));
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#endif
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page_table_check_pte_clear(mm, pte);
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