linux-kernel - [ 14/50] ARC: Handle zero-overhead-loop in unaligned access handler

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Date:	Wed, 16 Oct 2013 10:45:00 -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, Mischa Jonker <mjonker@...opsys.com>,
	Vineet Gupta <vgupta@...opsys.com>
Subject: [ 14/50] ARC: Handle zero-overhead-loop in unaligned access handler

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

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

From: Mischa Jonker <mjonker@...opsys.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@...opsys.com>
Signed-off-by: Vineet Gupta <vgupta@...opsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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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