From: Russell King Date: Mon, 17 Jan 2011 15:35:37 +0000 (+0000) Subject: ARM: v6k: select clear exclusive code seqences according to V6 variants X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=7db44c75a241c18d03e82540c5b825216d4c668b;p=linux-beck.git 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 --- diff --git a/arch/arm/kernel/entry-header.S b/arch/arm/kernel/entry-header.S index ae9464900168..051166c2a932 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 diff --git a/arch/arm/mm/abort-ev6.S b/arch/arm/mm/abort-ev6.S index f332df7f0d37..1478aa522144 100644 --- a/arch/arm/mm/abort-ev6.S +++ b/arch/arm/mm/abort-ev6.S @@ -20,11 +20,11 @@ */ .align 5 ENTRY(v6_early_abort) -#ifdef CONFIG_CPU_32v6K - clrex -#else +#ifdef CONFIG_CPU_V6 sub r1, sp, #4 @ Get unused stack location strex r0, r1, [r1] @ Clear the exclusive monitor +#elif defined(CONFIG_CPU_32v6K) + clrex #endif mrc p15, 0, r1, c5, c0, 0 @ get FSR mrc p15, 0, r0, c6, c0, 0 @ get FAR