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| author | James Hogan <james.hogan@imgtec.com> | 2013-02-12 16:04:53 +0000 |
|---|---|---|
| committer | James Hogan <james.hogan@imgtec.com> | 2013-03-02 20:11:14 +0000 |
| commit | fa771d029af8f8a23089c97b6ab6a5745e98ad7e (patch) | |
| tree | 949fbbe9278e5da6711d2da055888e82772c2a62 /arch/metag | |
| parent | 97c3ec63089fdcd2abf66619b913900909841dc0 (diff) | |
| download | linux-fa771d029af8f8a23089c97b6ab6a5745e98ad7e.tar.gz linux-fa771d029af8f8a23089c97b6ab6a5745e98ad7e.tar.bz2 linux-fa771d029af8f8a23089c97b6ab6a5745e98ad7e.zip | |
metag: move irq enable out of irqflags.h on SMP
The SMP version of arch_local_irq_enable() uses preempt_disable(), but
<asm/irqflags.h> doesn't include <linux/preempt.h> causing the following
errors on SMP when pstore/ftrace is enabled (caught by buildbot smp
allyesconfig):
In file included from include/linux/irqflags.h:15,
from fs/pstore/ftrace.c:16:
arch/metag/include/asm/irqflags.h: In function 'arch_local_irq_enable':
arch/metag/include/asm/irqflags.h:84: error: implicit declaration of function 'preempt_disable'
arch/metag/include/asm/irqflags.h:86: error: implicit declaration of function 'preempt_enable_no_resched'
However <linux/preempt.h> cannot be easily included from
<asm/irqflags.h> as it can cause circular include dependencies in the
!SMP case, and potentially in the SMP case in the future. Therefore move
the SMP implementation of arch_local_irq_enable() into traps.c and use
an inline version of get_trigger_mask() which is also defined in traps.c
for SMP.
This adds an extra layer of function call / stack push when
preempt_disable needs to call other functions, however in the
non-preemptive SMP case it should be about as fast, as it was already
calling the get_trigger_mask() function which is now used inline.
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Diffstat (limited to 'arch/metag')
| -rw-r--r-- | arch/metag/include/asm/irqflags.h | 11 | ||||
| -rw-r--r-- | arch/metag/kernel/traps.c | 16 |
2 files changed, 20 insertions, 7 deletions
diff --git a/arch/metag/include/asm/irqflags.h b/arch/metag/include/asm/irqflags.h index cba5e135bc9a..339b16f062eb 100644 --- a/arch/metag/include/asm/irqflags.h +++ b/arch/metag/include/asm/irqflags.h @@ -78,16 +78,15 @@ static inline void arch_local_irq_disable(void) asm volatile("MOV TXMASKI,%0\n" : : "r" (flags) : "memory"); } -static inline void arch_local_irq_enable(void) -{ #ifdef CONFIG_SMP - preempt_disable(); - arch_local_irq_restore(get_trigger_mask()); - preempt_enable_no_resched(); +/* Avoid circular include dependencies through <linux/preempt.h> */ +void arch_local_irq_enable(void); #else +static inline void arch_local_irq_enable(void) +{ arch_local_irq_restore(get_trigger_mask()); -#endif } +#endif #endif /* (__ASSEMBLY__) */ diff --git a/arch/metag/kernel/traps.c b/arch/metag/kernel/traps.c index 1ad363ce1ee9..202be405771e 100644 --- a/arch/metag/kernel/traps.c +++ b/arch/metag/kernel/traps.c @@ -15,6 +15,7 @@ #include <linux/types.h> #include <linux/init.h> #include <linux/interrupt.h> +#include <linux/preempt.h> #include <linux/ptrace.h> #include <linux/module.h> #include <linux/kallsyms.h> @@ -776,17 +777,30 @@ int traps_restore_context(void) #endif #ifdef CONFIG_SMP -unsigned int get_trigger_mask(void) +static inline unsigned int _get_trigger_mask(void) { unsigned long cpu = smp_processor_id(); return per_cpu(trigger_mask, cpu); } +unsigned int get_trigger_mask(void) +{ + return _get_trigger_mask(); +} + static void set_trigger_mask(unsigned int mask) { unsigned long cpu = smp_processor_id(); per_cpu(trigger_mask, cpu) = mask; } + +void arch_local_irq_enable(void) +{ + preempt_disable(); + arch_local_irq_restore(_get_trigger_mask()); + preempt_enable_no_resched(); +} +EXPORT_SYMBOL(arch_local_irq_enable); #else static void set_trigger_mask(unsigned int mask) { |