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authorQi Zheng <zhengqi.arch@bytedance.com>2022-09-29 14:23:18 +0300
committerAndrew Morton <akpm@linux-foundation.org>2022-10-13 04:51:50 +0300
commit14c2ac36811b82479b1138383b2c9ff1ab6ba47d (patch)
treecbc5cb7015c2315ddf76adeaa3bce95484c418fd /arch/loongarch
parentbce8cb3c04dc01d21b6b17baf1cb6c277e7e6848 (diff)
downloadlinux-14c2ac36811b82479b1138383b2c9ff1ab6ba47d.tar.xz
LoongArch: update local TLB if PTE entry exists
Currently, the implementation of update_mmu_tlb() is empty if __HAVE_ARCH_UPDATE_MMU_TLB is not defined. Then if two threads concurrently fault at the same page, the second thread that did not win the race will give up and do nothing. In the LoongArch architecture, this second thread will trigger another fault, and only updates its local TLB. Instead of triggering another fault, it's better to implement update_mmu_tlb() to directly update the local TLB of the second thread. Just do it. Link: https://lkml.kernel.org/r/20220929112318.32393-3-zhengqi.arch@bytedance.com Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com> Suggested-by: Bibo Mao <maobibo@loongson.cn> Acked-by: Huacai Chen <chenhuacai@loongson.cn> Cc: Chris Zankel <chris@zankel.net> Cc: David Hildenbrand <david@redhat.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Muchun Song <songmuchun@bytedance.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'arch/loongarch')
-rw-r--r--arch/loongarch/include/asm/pgtable.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/asm/pgtable.h
index 8ea57e2f0e04..946704bee599 100644
--- a/arch/loongarch/include/asm/pgtable.h
+++ b/arch/loongarch/include/asm/pgtable.h
@@ -412,6 +412,9 @@ static inline void update_mmu_cache(struct vm_area_struct *vma,
__update_tlb(vma, address, ptep);
}
+#define __HAVE_ARCH_UPDATE_MMU_TLB
+#define update_mmu_tlb update_mmu_cache
+
static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp)
{