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Subject[ 17/69] ARC: Handle zero-overhead-loop in unaligned access handler
Date
3.10-stable review patch.  If anyone has any objections, please let me know.

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

From: Mischa Jonker <mjonker@synopsys.com>

commit c11eb222fd7d4db91196121dbf854178505d2751 upstream.

If a load or store is the last instruction in a zero-overhead-loop, and
it's misaligned, the loop would execute only once.

This fixes that problem.

Signed-off-by: Mischa Jonker <mjonker@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/arc/kernel/unaligned.c | 6 ++++++
1 file changed, 6 insertions(+)

--- a/arch/arc/kernel/unaligned.c
+++ b/arch/arc/kernel/unaligned.c
@@ -233,6 +233,12 @@ int misaligned_fixup(unsigned long addre
regs->status32 &= ~STATUS_DE_MASK;
} else {
regs->ret += state.instr_len;
+
+ /* handle zero-overhead-loop */
+ if ((regs->ret == regs->lp_end) && (regs->lp_count)) {
+ regs->ret = regs->lp_start;
+ regs->lp_count--;
+ }
}

return 0;



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