This is a note to let you know that I've just added the patch titled
sparc: tsb must be flushed before tlb
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sparc-tsb-must-be-flushed-before-tlb.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d0d7673966f14eed130d49f8da5912b45aef9899 Mon Sep 17 00:00:00 2001
From: Dave Kleikamp <dave.kleikamp@xxxxxxxxxx>
Date: Tue, 18 Jun 2013 09:05:36 -0500
Subject: sparc: tsb must be flushed before tlb
From: Dave Kleikamp <dave.kleikamp@xxxxxxxxxx>
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@xxxxxxxxxx>
Acked-by: Bob Picco <bob.picco@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/sparc/mm/tlb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/sparc/mm/tlb.c
+++ b/arch/sparc/mm/tlb.c
@@ -115,8 +115,8 @@ no_cache_flush:
}
if (!tb->active) {
- global_flush_tlb_page(mm, vaddr);
flush_tsb_user_page(mm, vaddr);
+ global_flush_tlb_page(mm, vaddr);
goto out;
}
Patches currently in stable-queue which might be from dave.kleikamp@xxxxxxxxxx are
queue-3.4/sparc-tsb-must-be-flushed-before-tlb.patch
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