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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-06-26 12:47:08 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-07-02 10:56:12 +0100 |
| commit | 30891c90d81133179cc47eb77c30764a3b5dad5c (patch) | |
| tree | 4af470a3f2d999ec8feefce84b6d502c28cdfbb4 /arch/arm/kernel/entry-armv.S | |
| parent | 40f0b90a2f16f433f9afbfef4b7c312efb54e933 (diff) | |
| download | linux-30891c90d81133179cc47eb77c30764a3b5dad5c.tar.gz linux-30891c90d81133179cc47eb77c30764a3b5dad5c.tar.bz2 linux-30891c90d81133179cc47eb77c30764a3b5dad5c.zip | |
ARM: entry: no need to reload the SPSR value from struct pt_regs
The SVC IRQ, prefetch and data abort handlers preserve the SPSR value
via r5 across the exception. Rather than re-loading it from pt_regs,
use the preserved value instead.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/entry-armv.S')
| -rw-r--r-- | arch/arm/kernel/entry-armv.S | 10 |
1 files changed, 1 insertions, 9 deletions
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S index bbdd443b8055..fa02a22a4c4b 100644 --- a/arch/arm/kernel/entry-armv.S +++ b/arch/arm/kernel/entry-armv.S @@ -195,10 +195,6 @@ __dabt_svc: @ disable_irq_notrace - @ - @ restore SPSR and restart the instruction - @ - ldr r5, [sp, #S_PSR] #ifdef CONFIG_TRACE_IRQFLAGS tst r5, #PSR_I_BIT bleq trace_hardirqs_on @@ -223,7 +219,7 @@ __irq_svc: tst r0, #_TIF_NEED_RESCHED blne svc_preempt #endif - ldr r5, [sp, #S_PSR] + #ifdef CONFIG_TRACE_IRQFLAGS @ The parent context IRQs must have been enabled to get here in @ the first place, so there's no point checking the PSR I bit. @@ -308,10 +304,6 @@ __pabt_svc: @ disable_irq_notrace - @ - @ restore SPSR and restart the instruction - @ - ldr r5, [sp, #S_PSR] #ifdef CONFIG_TRACE_IRQFLAGS tst r5, #PSR_I_BIT bleq trace_hardirqs_on |