x86/uaccess: utilize CONFIG_CC_HAS_ASM_GOTO_OUTPUT

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Clang-11 shipped support for outputs to asm goto statments along the
fallthrough path.  Double up some of the get_user() and related macros
to be able to take advantage of this extended GNU C extension. This
should help improve the generated code's performance for these accesses.

Cc: Bill Wendling <morbo@google.com>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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Nick Desaulniers 2020-08-07 13:59:18 -07:00 • committed by Linus Torvalds

parent d55564cfc2

commit 865c50e1d2

1 changed files with 66 additions and 0 deletions

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arch/x86/include/asm/uaccess.h

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