Messages in this thread Patch in this message | | | Date | Tue, 04 Nov 2014 08:23:06 +0000 | From | "Jan Beulich" <> | Subject | [PATCH] irqflags: fix (at least latent) code generation issue |
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The conditional in local_irq_restore() otherwise can cause code bloat (the if and else blocks may get translated into separate code paths despite the generated code being identical, dependent on compiler internal heuristics). Note that this adjustment gets the code in sync with the comment preceding it (which was slightly wrong from at least from 2.6.37 onwards).
The code bloat was observed in reality with an experimental x86 patch I'm about to post as RFC.
Signed-off-by: Jan Beulich <jbeulich@suse.com> --- include/linux/irqflags.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- 3.18-rc3/include/linux/irqflags.h +++ 3.18-rc3-irqflags/include/linux/irqflags.h @@ -85,7 +85,7 @@ * The local_irq_*() APIs are equal to the raw_local_irq*() * if !TRACE_IRQFLAGS. */ -#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT +#ifdef CONFIG_TRACE_IRQFLAGS #define local_irq_enable() \ do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0) #define local_irq_disable() \ @@ -131,7 +131,7 @@ } while (0) -#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ +#else /* !CONFIG_TRACE_IRQFLAGS */ #define local_irq_enable() do { raw_local_irq_enable(); } while (0) #define local_irq_disable() do { raw_local_irq_disable(); } while (0) @@ -145,6 +145,6 @@ #define irqs_disabled_flags(flags) (raw_irqs_disabled_flags(flags)) #define safe_halt() do { raw_safe_halt(); } while (0) -#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ +#endif /* CONFIG_TRACE_IRQFLAGS */ #endif
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