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| author | Xiangyu Lu <luxiangyu@huawei.com> | 2014-04-15 12:38:17 +0400 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2014-04-23 01:23:57 +0400 |
| commit | 80bb3ef109ff40a7593d9481c17de9bbc4d7c0e2 (patch) | |
| tree | dc0a1e842f2cb6f1048fbda81b4fa51f3376ba11 /arch/arm/common/bL_switcher.c | |
| parent | 244b478386260a8a9150b501bc97644e2e07f8d3 (diff) | |
| download | linux-80bb3ef109ff40a7593d9481c17de9bbc4d7c0e2.tar.xz | |
ARM: 8027/1: fix do_div() bug in big-endian systems
In big-endian systems, "%1" get the most significant part of the value, cause the instruction to get the wrong result.
When viewing ftrace record in big-endian ARM systems, we found that
the timestamp errors:
swapper-0 [001] 1325.970000: 0:120:R ==> [001] 16:120:R events/1
events/1-16 [001] 1325.970000: 16:120:S ==> [001] 0:120:R swapper
swapper-0 [000] 1325.1000000: 0:120:R + [000] 15:120:R events/0
swapper-0 [000] 1325.1000000: 0:120:R ==> [000] 15:120:R events/0
swapper-0 [000] 1326.030000: 0:120:R + [000] 1150:120:R sshd
swapper-0 [000] 1326.030000: 0:120:R ==> [000] 1150:120:R sshd
When viewed ftrace records, it will call the do_div(n, base) function, which achieved arch/arm/include/asm/div64.h in. When n = 10000000, base = 1000000, in do_div(n, base) will execute "umull %Q0, %R0, %1, %Q2".
Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Nicolas Pitre <nico@linaro.org>
Cc: <stable@vger.kernel.org> # 2.6.20+
Signed-off-by: Alex Wu <wuquanming@huawei.com>
Signed-off-by: Xiangyu Lu <luxiangyu@huawei.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/common/bL_switcher.c')
0 files changed, 0 insertions, 0 deletions