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(parent: 970b608) | patch
Improve __copy_to_user and __copy_from_user performance
authorpopcornmix <popcornmix@gmail.com>
Mon, 28 Nov 2016 16:50:04 +0000 (16:50 +0000)
committerpopcornmix <popcornmix@gmail.com>
Wed, 1 Jul 2020 15:32:38 +0000 (16:32 +0100)
commit17e7f9b94f221dccc31cdd28bdf05026aa0581eb
treeb6bc19a685fed7fc47aab8083d44b0d668b69f7dtree | snapshot
parent970b60864c2224e8081e538dc6a29c11b041c121commit | diff
Improve __copy_to_user and __copy_from_user performance

Provide a __copy_from_user that uses memcpy. On BCM2708, use
optimised memcpy/memmove/memcmp/memset implementations.

arch/arm: Add mmiocpy/set aliases for memcpy/set

See: https://github.com/raspberrypi/linux/issues/1082

copy_from_user: CPU_SW_DOMAIN_PAN compatibility

The downstream copy_from_user acceleration must also play nice with
CONFIG_CPU_SW_DOMAIN_PAN.

See: https://github.com/raspberrypi/linux/issues/1381

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
13 files changed:
arch/arm/include/asm/string.h diff | blob | history
arch/arm/include/asm/uaccess.h diff | blob | history
arch/arm/lib/Makefile diff | blob | history
arch/arm/lib/arm-mem.h [new file with mode: 0644] blob
arch/arm/lib/copy_from_user.S diff | blob | history
arch/arm/lib/exports_rpi.c [new file with mode: 0644] blob
arch/arm/lib/memcmp_rpi.S [new file with mode: 0644] blob
arch/arm/lib/memcpy_rpi.S [new file with mode: 0644] blob
arch/arm/lib/memcpymove.h [new file with mode: 0644] blob
arch/arm/lib/memmove_rpi.S [new file with mode: 0644] blob
arch/arm/lib/memset_rpi.S [new file with mode: 0644] blob
arch/arm/lib/uaccess_with_memcpy.c diff | blob | history
arch/arm/mach-bcm/Kconfig diff | blob | history
Domain: System / Kernel;