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authorRussell King <rmk+kernel@arm.linux.org.uk>2016-03-29 11:08:22 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2016-04-01 23:27:47 +0100
commit0fc03d4c87611cefa4df10404a7e0df49b0a2132 (patch)
tree5e33af3bf03f264863b65906680db6a2ca4e4b35 /arch/arm/mm/proc-v7.S
parentf55532a0c0b8bb6148f4e07853b876ef73bc69ca (diff)
downloadlinux-0fc03d4c87611cefa4df10404a7e0df49b0a2132.tar.bz2
ARM: SMP enable of cache maintanence broadcast
Masahiro Yamada reports that we can fail to set the FW bit in the auxiliary control register, which enables broadcasting the cache maintanence operations. This occurs because we only check that the SMP/nAMP bit is set, rather than checking whether all the bits we want to be set are set. Rearrange the code to ensure that all desired bits are set, and only update the register if we discover some required bits are not set. Tested-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'arch/arm/mm/proc-v7.S')
-rw-r--r--arch/arm/mm/proc-v7.S10
1 files changed, 5 insertions, 5 deletions
diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S
index 0f8963a7e7d9..6fcaac8e200f 100644
--- a/arch/arm/mm/proc-v7.S
+++ b/arch/arm/mm/proc-v7.S
@@ -281,12 +281,12 @@ __v7_ca17mp_setup:
bl v7_invalidate_l1
ldmia r12, {r1-r6, lr}
#ifdef CONFIG_SMP
+ orr r10, r10, #(1 << 6) @ Enable SMP/nAMP mode
ALT_SMP(mrc p15, 0, r0, c1, c0, 1)
- ALT_UP(mov r0, #(1 << 6)) @ fake it for UP
- tst r0, #(1 << 6) @ SMP/nAMP mode enabled?
- orreq r0, r0, #(1 << 6) @ Enable SMP/nAMP mode
- orreq r0, r0, r10 @ Enable CPU-specific SMP bits
- mcreq p15, 0, r0, c1, c0, 1
+ ALT_UP(mov r0, r10) @ fake it for UP
+ orr r10, r10, r0 @ Set required bits
+ teq r10, r0 @ Were they already set?
+ mcrne p15, 0, r10, c1, c0, 1 @ No, update register
#endif
b __v7_setup_cont