powerpc/uaccess: Use asm goto for get_user when compiler supports it

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clang 11 and future GCC are supporting asm goto with outputs.

Use it to implement get_user in order to get better generated code.

Note that clang requires to set x in the default branch of
__get_user_size_goto() otherwise is compliant about x not being
initialised :puzzled:

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/403745b5aaa1b315bb4e8e46c1ba949e77eecec0.1615398265.git.christophe.leroy@csgroup.eu

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Christophe Leroy 2021-03-10 17:46:54 +00:00 • committed by Michael Ellerman

parent 035785ab28

commit 5cd29b1fd3

1 changed files with 55 additions and 0 deletions

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arch/powerpc/include/asm/uaccess.h

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