x86: don't use REP_GOOD or ERMS for user memory copies

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The modern target to use is FSRM (Fast Short REP MOVS), and the other
cases should only be used for bigger areas (ie mainly things like page
clearing).

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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Linus Torvalds 2023-04-15 13:14:59 -07:00

parent 20f3337d35

commit adfcf4231b

2 changed files with 12 additions and 54 deletions

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15

arch/x86/include/asm/uaccess_64.h

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53

arch/x86/lib/copy_user_64.S

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