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authorPaul Burton <paul.burton@mips.com>2019-10-08 21:46:01 +0200
committerPaul Burton <paul.burton@mips.com>2019-10-09 21:48:05 +0200
commit3c0be5849259b729580c23549330973a2dd513a2 (patch)
tree27ce480015e39e2469b4fe479a1b62976ad83be5 /arch/mips/fw/arc/misc.c
parentMIPS: Provide unroll() macro, use it for cache ops (diff)
downloadlinux-3c0be5849259b729580c23549330973a2dd513a2.tar.xz
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MIPS: Drop 32-bit asm string functions
We have assembly implementations of strcpy(), strncpy(), strcmp() & strncmp() which: - Are simple byte-at-a-time loops with no particular optimizations. As a comment in the code describes, they're "rather naive". - Offer no clear performance advantage over the generic C implementations - in microbenchmarks performed by Alexander Lobakin the asm functions sometimes win & sometimes lose, but generally not by large margins in either direction. - Don't support 64-bit kernels, where we already make use of the generic C implementations. - Tend to bloat kernel code size due to inlining. - Don't support CONFIG_FORTIFY_SOURCE. - Won't support nanoMIPS without rework. For all of these reasons, delete the asm implementations & make use of the generic C implementations for 32-bit kernels just like we already do for 64-bit kernels. Signed-off-by: Paul Burton <paul.burton@mips.com> URL: https://lore.kernel.org/linux-mips/a2a35f1cf58d6db19eb4af9b4ae21e35@dlink.ru/ Cc: Alexander Lobakin <alobakin@dlink.ru> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Cc: linux-mips@vger.kernel.org
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