From 7db44c75a241c18d03e82540c5b825216d4c668b Mon Sep 17 00:00:00 2001 From: Russell King Date: Mon, 17 Jan 2011 15:35:37 +0000 Subject: ARM: v6k: select clear exclusive code seqences according to V6 variants If CONFIG_CPU_V6 is enabled, then the kernel must support ARMv6 CPUs which don't have the V6K extensions implemented. Always use the dummy store-exclusive method to ensure that the exclusive monitors are cleared. If CONFIG_CPU_V6 is not set, but CONFIG_CPU_32v6K is enabled, then we have the K extensions available on all CPUs we're building support for, so we can use the new clear-exclusive instruction. Acked-by: Tony Lindgren Tested-by: Sourav Poddar Tested-by: Will Deacon Signed-off-by: Russell King --- arch/arm/kernel/entry-header.S | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) (limited to 'arch/arm/kernel') diff --git a/arch/arm/kernel/entry-header.S b/arch/arm/kernel/entry-header.S index ae946490016..051166c2a93 100644 --- a/arch/arm/kernel/entry-header.S +++ b/arch/arm/kernel/entry-header.S @@ -76,13 +76,13 @@ #ifndef CONFIG_THUMB2_KERNEL .macro svc_exit, rpsr msr spsr_cxsf, \rpsr -#if defined(CONFIG_CPU_32v6K) - clrex @ clear the exclusive monitor - ldmia sp, {r0 - pc}^ @ load r0 - pc, cpsr -#elif defined (CONFIG_CPU_V6) +#if defined(CONFIG_CPU_V6) ldr r0, [sp] strex r1, r2, [sp] @ clear the exclusive monitor ldmib sp, {r1 - pc}^ @ load r1 - pc, cpsr +#elif defined(CONFIG_CPU_32v6K) + clrex @ clear the exclusive monitor + ldmia sp, {r0 - pc}^ @ load r0 - pc, cpsr #else ldmia sp, {r0 - pc}^ @ load r0 - pc, cpsr #endif @@ -92,10 +92,10 @@ ldr r1, [sp, #\offset + S_PSR] @ get calling cpsr ldr lr, [sp, #\offset + S_PC]! @ get pc msr spsr_cxsf, r1 @ save in spsr_svc -#if defined(CONFIG_CPU_32v6K) - clrex @ clear the exclusive monitor -#elif defined (CONFIG_CPU_V6) +#if defined(CONFIG_CPU_V6) strex r1, r2, [sp] @ clear the exclusive monitor +#elif defined(CONFIG_CPU_32v6K) + clrex @ clear the exclusive monitor #endif .if \fast ldmdb sp, {r1 - lr}^ @ get calling r1 - lr -- cgit v1.2.3-70-g09d2