linux-kernel - [PATCH 3.13 043/149] ARC: Use correct PTAG register for icache flush

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Date:	Thu, 20 Mar 2014 17:03:26 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Vineet Gupta <vgupta@...opsys.com>,
	arc-linux-dev@...opsys.com,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 3.13 043/149] ARC: Use correct PTAG register for icache flush

3.13-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vineet Gupta <vgupta@...opsys.com>

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@...opsys.com>
Cc: arc-linux-dev@...opsys.com
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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
 	}


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