Messages in this thread Patch in this message | | | From | Christophe Leroy <> | Subject | [PATCH v4 15/20] powerpc/mm: Avoid useless lock with single page fragments | Date | Tue, 18 Sep 2018 16:57:32 +0000 (UTC) |
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There is no point in taking the page table lock as pte_frag is always NULL when we have only one fragment.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> --- arch/powerpc/mm/pgtable-frag.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/powerpc/mm/pgtable-frag.c b/arch/powerpc/mm/pgtable-frag.c index bc924822dcd6..ab4910e92aaf 100644 --- a/arch/powerpc/mm/pgtable-frag.c +++ b/arch/powerpc/mm/pgtable-frag.c @@ -85,6 +85,9 @@ static pte_t *get_pte_from_cache(struct mm_struct *mm) { void *pte_frag, *ret; + if (PTE_FRAG_NR == 1) + return NULL; + spin_lock(&mm->page_table_lock); ret = mm->context.pte_frag; if (ret) { -- 2.13.3
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