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authorNicolas Pitre <nicolas.pitre@linaro.org>2015-12-12 04:49:21 +0300
committerRussell King <rmk+kernel@arm.linux.org.uk>2015-12-17 13:29:01 +0300
commit42f25bddd0a226d2431e057b9e01c5cc61067e12 (patch)
tree33e3bf9c4669caba06f72303e5d333e2acd15e78 /arch/arm/include/asm/cpuidle.h
parent38fc2f6c98262913388de338d5b0cda67e3f78cd (diff)
downloadlinux-42f25bddd0a226d2431e057b9e01c5cc61067e12.tar.xz
ARM: 8477/1: runtime patch udiv/sdiv instructions into __aeabi_{u}idiv()
The ARM compiler inserts calls to __aeabi_idiv() and __aeabi_uidiv() when it needs to perform division on signed and unsigned integers. If a processor has support for the sdiv and udiv instructions, the kernel may overwrite the beginning of those functions with those instructions and a "bx lr" to get better performance. To ensure that those functions are aligned to a 32-bit word for easier patching (which might not always be the case in Thumb mode) and that the two patched instructions end up in the same cache line, a 8-byte alignment is enforced when ARM_PATCH_IDIV is selected. This was heavily inspired by a previous patch from Stephen Boyd. Signed-off-by: Nicolas Pitre <nico@linaro.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include/asm/cpuidle.h')
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