path: root/arch/arm/include/asm/percpu.h
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2012-12-03ARM: 7587/1: implement optimized percpu variable accessRob Herring1-0/+45
Use the previously unused TPIDRPRW register to store percpu offsets. TPIDRPRW is only accessible in PL1, so it can only be used in the kernel. This replaces 2 loads with a mrc instruction for each percpu variable access. With hackbench, the performance improvement is 1.4% on Cortex-A9 (highbank). Taking an average of 30 runs of "hackbench -l 1000" yields: Before: 6.2191 After: 6.1348 Will Deacon reported similar delta on v6 with 11MPCore. The asm "memory clobber" are needed here to ensure the percpu offset gets reloaded. Testing by Will found that this would not happen in __schedule() which is a bit of a special case as preemption is disabled but the execution can move cores. Signed-off-by: Rob Herring <rob.herring@calxeda.com> Acked-by: Will Deacon <will.deacon@arm.com> Acked-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-10-17ARM: 7006/1: Migrate to asm-generic wrapper supportStephen Boyd1-6/+0
With d8ecc5c (kbuild: asm-generic support, 2011-04-27) we can remove a handful of asm-generic wrappers in ARM code. Since the generic version of sizes.h doesn't contain SZ_48M, we replace the 4 users of SZ_48M with the equivalent SZ_32M + SZ_16M. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Cc: Imre Kaloz <kaloz@openwrt.org> Acked-by: Krzysztof Halasa <khc@pm.waw.pl> Cc: Eric Miao <eric.y.miao@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-08-02[ARM] move include/asm-arm to arch/arm/include/asmRussell King1-0/+6
Move platform independent header files to arch/arm/include/asm, leaving those in asm/arch* and asm/plat* alone. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>