ARC: Use correct PTAG register for icache flush

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@synopsys.com>
Cc: linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org  # 3.13
Cc: arc-linux-dev@synopsys.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/arc/mm/cache_arc700.c b/arch/arc/mm/cache_arc700.c
index 6b58c1d..400c663 100644 (file)
--- 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
        }