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authorDave Kleikamp <dave.kleikamp@oracle.com>2013-06-18 09:05:36 -0500
committerDavid S. Miller <davem@davemloft.net>2013-06-19 02:10:30 -0700
commit23a01138efe216f8084cfaa74b0b90dd4b097441 (patch)
tree3a13b9b2383b9077e54d998abb2e41365abe7aa6 /arch/sparc/mm
parentf670758f5b829169562e1016a72af0c59360a541 (diff)
downloadlinux-23a01138efe216f8084cfaa74b0b90dd4b097441.tar.bz2
sparc: tsb must be flushed before tlb
This fixes a race where a cpu may re-load a tlb from a stale tsb right after it has been flushed by a remote function call. I still see some instability when stressing the system with parallel kernel builds while creating memory pressure by writing to /proc/sys/vm/nr_hugepages, but this patch improves the stability significantly. Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com> Acked-by: Bob Picco <bob.picco@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/mm')
-rw-r--r--arch/sparc/mm/tlb.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/sparc/mm/tlb.c b/arch/sparc/mm/tlb.c
index 83d89bcb44af..37e7bc4c95b3 100644
--- a/arch/sparc/mm/tlb.c
+++ b/arch/sparc/mm/tlb.c
@@ -85,8 +85,8 @@ static void tlb_batch_add_one(struct mm_struct *mm, unsigned long vaddr,
}
if (!tb->active) {
- global_flush_tlb_page(mm, vaddr);
flush_tsb_user_page(mm, vaddr);
+ global_flush_tlb_page(mm, vaddr);
goto out;
}