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authorAnton Blanchard <anton@samba.org>2011-11-23 20:07:22 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-11-25 14:11:26 +1100
commit7df1027542c9353bef4d027cb4ab8e99f69017b7 (patch)
tree297c93c0937a05a66235f24fbab1c58e8dd93514 /arch/powerpc/include/asm
parent621692cb7efb6d0e38c62e41844a6360c6719b20 (diff)
downloadlinaro-lsk-7df1027542c9353bef4d027cb4ab8e99f69017b7.tar.gz
powerpc/time: Optimise decrementer_check_overflow
decrementer_check_overflow is called from arch_local_irq_restore so we want to make it as light weight as possible. As such, turn decrementer_check_overflow into an inline function. To avoid a circular mess of includes, separate out the two components of struct decrementer_clock and keep the struct clock_event_device part local to time.c. The fast path improves from: arch_local_irq_restore 0: mflr r0 4: std r0,16(r1) 8: stdu r1,-112(r1) c: stb r3,578(r13) 10: cmpdi cr7,r3,0 14: beq- cr7,24 <.arch_local_irq_restore+0x24> ... 24: addi r1,r1,112 28: ld r0,16(r1) 2c: mtlr r0 30: blr to: arch_local_irq_restore 0: std r30,-16(r1) 4: ld r30,0(r2) 8: stb r3,578(r13) c: cmpdi cr7,r3,0 10: beq- cr7,6c <.arch_local_irq_restore+0x6c> ... 6c: ld r30,-16(r1) 70: blr Unfortunately we still setup a local TOC (due to -mminimal-toc). Yet another sign we should be moving to -mcmodel=medium. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm')
-rw-r--r--arch/powerpc/include/asm/time.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/time.h b/arch/powerpc/include/asm/time.h
index bc3c745cb90..7eb10fb96cd 100644
--- a/arch/powerpc/include/asm/time.h
+++ b/arch/powerpc/include/asm/time.h
@@ -219,7 +219,7 @@ DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
extern void secondary_cpu_time_init(void);
extern void iSeries_time_init_early(void);
-extern void decrementer_check_overflow(void);
+DECLARE_PER_CPU(u64, decrementers_next_tb);
#endif /* __KERNEL__ */
#endif /* __POWERPC_TIME_H */