Hi Linus,
This patch fixes a subtle issue with cache flush which could potentially
cause random userspace crashes because of stale icache lines.
Please apply for 3.14, it's marked for stable as well.
Thx,
-Vineet
-------------->8------------
>From 036837642ed6df39f6a063ad10327787b60d4a0f Mon Sep 17 00:00:00 2001
From: Vineet Gupta <vgu...@synopsys.com>
Date: Fri, 7 Mar 2014 13:22:22 +0530
Subject: [PATCH] ARC: Use correct PTAG register for icache flush
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 <vgu...@synopsys.com>
Cc: linux-kernel@vger.kernel.org
Cc: sta...@vger.kernel.org # 3.13
Cc: arc-linux-...@synopsys.com
---
arch/arc/mm/cache_arc700.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arc/mm/cache_arc700.c b/arch/arc/mm/cache_arc700.c
index 6b58c1de7577..400c663b21c2 100644
--- a/arch/arc/mm/cache_arc700.c
+++ b/arch/arc/mm/cache_arc700.c
@@ -282,7 +282,7 @@ static inline void __cache_line_loop(unsigned long paddr,
unsigned long vaddr,
#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(unsigned long paddr,
unsigned long vaddr,
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
}
--
1.8.3.2
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