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authorUwe Kleine-König <u.kleine-koenig@pengutronix.de>2011-12-15 21:47:56 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2011-12-15 14:02:19 -0800
commitddf5a25c5fdd4cc276edf451871c38002eec0f95 (patch)
tree6262274a4299ace9b83bc14649049f405c348df0
parent42ebfc61cfcb13af3e638db1c497dcbde7abfed8 (diff)
ARM: unwinder: fix bisection to find origin in .idx section
The bisection implemented in unwind_find_origin() stopped to early. If there is only a single entry left to check the original code just took the end point as origin which might be wrong. This was introduced in commit de66a979012d ("ARM: 7187/1: fix unwinding for XIP kernels"). Reported-and-tested-by: Nick Bowler <nbowler@elliptictech.com> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/arm/kernel/unwind.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm/kernel/unwind.c b/arch/arm/kernel/unwind.c
index 3f03fe0c3269..00df012c4678 100644
--- a/arch/arm/kernel/unwind.c
+++ b/arch/arm/kernel/unwind.c
@@ -160,12 +160,12 @@ static const struct unwind_idx *unwind_find_origin(
const struct unwind_idx *start, const struct unwind_idx *stop)
{
pr_debug("%s(%p, %p)\n", __func__, start, stop);
- while (start < stop - 1) {
+ while (start < stop) {
const struct unwind_idx *mid = start + ((stop - start) >> 1);
if (mid->addr_offset >= 0x40000000)
/* negative offset */
- start = mid;
+ start = mid + 1;
else
/* positive offset */
stop = mid;