This is a note to let you know that I've just added the patch titled
ARC: Use correct PTAG register for icache flush
to the 3.13-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:
arc-use-correct-ptag-register-for-icache-flush.patch
and it can be found in the queue-3.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b053940df41808f0f27568eb36820d10a8a987f8 Mon Sep 17 00:00:00 2001
From: Vineet Gupta <vgupta@xxxxxxxxxxxx>
Date: Fri, 7 Mar 2014 13:22:22 +0530
Subject: ARC: Use correct PTAG register for icache flush
From: Vineet Gupta <vgupta@xxxxxxxxxxxx>
commit b053940df41808f0f27568eb36820d10a8a987f8 upstream.
This fixes a subtle issue with cache flush which could potentially cause
random userspace crashes because of stale icache lines.
This error crept in when consolidating the cache flush code
Fixes: bd12976c3664 (ARC: cacheflush refactor #3: Unify the {d,i}cache)
Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx>
Cc: arc-linux-dev@xxxxxxxxxxxx
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arc/mm/cache_arc700.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/arc/mm/cache_arc700.c
+++ b/arch/arc/mm/cache_arc700.c
@@ -282,7 +282,7 @@ static inline void __cache_line_loop(uns
#else
/* if V-P const for loop, PTAG can be written once outside loop */
if (full_page_op)
- write_aux_reg(ARC_REG_DC_PTAG, paddr);
+ write_aux_reg(aux_tag, paddr);
#endif
while (num_lines-- > 0) {
@@ -296,7 +296,7 @@ static inline void __cache_line_loop(uns
write_aux_reg(aux_cmd, vaddr);
vaddr += L1_CACHE_BYTES;
#else
- write_aux_reg(aux, paddr);
+ write_aux_reg(aux_cmd, paddr);
paddr += L1_CACHE_BYTES;
#endif
}
Patches currently in stable-queue which might be from vgupta@xxxxxxxxxxxx are
queue-3.13/arc-use-correct-ptag-register-for-icache-flush.patch
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