diff options
| author | Anson Huang <Anson.Huang@freescale.com> | 2015-12-07 10:09:19 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-12-15 11:51:41 +0000 |
| commit | fa0708b320f6da4c1104fe56e01b7abf66fd16ad (patch) | |
| tree | 123a5f2e6e4f52a4292261c7ce63041531976a5c /arch/arm/kernel/swp_emulate.c | |
| parent | c014953d84ec21a4df9a43be2378861ea6e9246e (diff) | |
ARM: 8471/1: need to save/restore arm register(r11) when it is corrupted
In cpu_v7_do_suspend routine, r11 is used while it is NOT
saved/restored, different compiler may have different usage
of ARM general registers, so it may cause issues during
calling cpu_v7_do_suspend.
We meet kernel fault occurs when using GCC 4.8.3, r11 contains
valid value before calling into cpu_v7_do_suspend, but when returned
from this routine, r11 is corrupted and lead to kernel fault.
Doing save/restore for those corrupted registers is a must in
assemble code.
Signed-off-by: Anson Huang <Anson.Huang@freescale.com>
Reviewed-by: Nicolas Pitre <nico@linaro.org>
Cc: <stable@vger.kernel.org> # v3.3+
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/swp_emulate.c')
0 files changed, 0 insertions, 0 deletions