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authorNicolas Pitre <nicolas.pitre@linaro.org>2013-08-14 10:25:14 -0400
committerOlof Johansson <olof@lixom.net>2013-08-14 13:05:42 -0700
commitfac2e57742d9aa3dbe41860280352efda9d5566e (patch)
treef57b0c2ff1ebf3a0d4b69aa2141d14c6fa22050a /arch/arm/mach-vexpress/dcscb.c
parentf2d6e550a23e6ea5aca70817ada87b78f2b8c6c1 (diff)
downloadlinux-fac2e57742d9aa3dbe41860280352efda9d5566e.tar.bz2
ARM: vexpress/MCPM: fix cache disable sequence when CONFIG_FRAME_POINTER=y
If CONFIG_FRAME_POINTER=y we get the following error: arch/arm/mach-vexpress/tc2_pm.c: In function 'tc2_pm_down': arch/arm/mach-vexpress/tc2_pm.c:200:1: error: fp cannot be used in asm here Let's fix that by explicitly preserving r11 on the stack and removing it from the clobber list. Reported-by: Russell King <rmk+kernel@arm.linux.org.uk> Reviewed-by: Dave Martin <Dave.Martin@arm.com> Signed-off-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'arch/arm/mach-vexpress/dcscb.c')
-rw-r--r--arch/arm/mach-vexpress/dcscb.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/arch/arm/mach-vexpress/dcscb.c b/arch/arm/mach-vexpress/dcscb.c
index 85fffa702f5b..3a6384c6c435 100644
--- a/arch/arm/mach-vexpress/dcscb.c
+++ b/arch/arm/mach-vexpress/dcscb.c
@@ -144,8 +144,13 @@ static void dcscb_power_down(void)
* Let's do it in the safest possible way i.e. with
* no memory access within the following sequence
* including to the stack.
+ *
+ * Note: fp is preserved to the stack explicitly prior doing
+ * this since adding it to the clobber list is incompatible
+ * with having CONFIG_FRAME_POINTER=y.
*/
asm volatile(
+ "str fp, [sp, #-4]! \n\t"
"mrc p15, 0, r0, c1, c0, 0 @ get CR \n\t"
"bic r0, r0, #"__stringify(CR_C)" \n\t"
"mcr p15, 0, r0, c1, c0, 0 @ set CR \n\t"
@@ -156,9 +161,10 @@ static void dcscb_power_down(void)
"bic r0, r0, #(1 << 6) @ disable local coherency \n\t"
"mcr p15, 0, r0, c1, c0, 1 @ set AUXCR \n\t"
"isb \n\t"
- "dsb "
+ "dsb \n\t"
+ "ldr fp, [sp], #4"
: : : "r0","r1","r2","r3","r4","r5","r6","r7",
- "r9","r10","r11","lr","memory");
+ "r9","r10","lr","memory");
/*
* This is a harmless no-op. On platforms with a real
@@ -182,6 +188,7 @@ static void dcscb_power_down(void)
* Let's do it in the safest possible way as above.
*/
asm volatile(
+ "str fp, [sp, #-4]! \n\t"
"mrc p15, 0, r0, c1, c0, 0 @ get CR \n\t"
"bic r0, r0, #"__stringify(CR_C)" \n\t"
"mcr p15, 0, r0, c1, c0, 0 @ set CR \n\t"
@@ -192,9 +199,10 @@ static void dcscb_power_down(void)
"bic r0, r0, #(1 << 6) @ disable local coherency \n\t"
"mcr p15, 0, r0, c1, c0, 1 @ set AUXCR \n\t"
"isb \n\t"
- "dsb "
+ "dsb \n\t"
+ "ldr fp, [sp], #4"
: : : "r0","r1","r2","r3","r4","r5","r6","r7",
- "r9","r10","r11","lr","memory");
+ "r9","r10","lr","memory");
}
__mcpm_cpu_down(cpu, cluster);