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[ARM SMP] Clear the exclusive monitor on ARMv6 CPUs on context switch

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Ensure that the exclusive monitor is cleared on context switch with
ARMv6 CPUs.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2005-08-10 14:52:52 +01:00 committed by Russell King
parent 3c4ee4e252
commit b876386ee4
1 changed files with 7 additions and 0 deletions
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7
arch/arm/kernel/entry-armv.S
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@ -533,6 +533,13 @@ ENTRY(__switch_to)
ldr r3, [r2, #TI_TP_VALUE] ldr r3, [r2, #TI_TP_VALUE]
stmia ip!, {r4 - sl, fp, sp, lr} @ Store most regs on stack stmia ip!, {r4 - sl, fp, sp, lr} @ Store most regs on stack
ldr r6, [r2, #TI_CPU_DOMAIN]! ldr r6, [r2, #TI_CPU_DOMAIN]!
#if __LINUX_ARM_ARCH__ >= 6
#ifdef CONFIG_CPU_MPCORE
clrex
#else
strex r3, r4, [ip] @ Clear exclusive monitor
#endif
#endif
#if defined(CONFIG_CPU_XSCALE) && !defined(CONFIG_IWMMXT) #if defined(CONFIG_CPU_XSCALE) && !defined(CONFIG_IWMMXT)
mra r4, r5, acc0 mra r4, r5, acc0
stmia ip, {r4, r5} stmia ip, {r4, r5}