powerpc/signal32: Add and use unsafe_put_sigset_t()

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put_sigset_t() calls copy_to_user() for copying two words.

This is terribly inefficient for copying two words.

By switching to unsafe_put_user(), we end up with something as
simple as:

 3cc:   81 3d 00 00     lwz     r9,0(r29)
 3d0:   91 26 00 b4     stw     r9,180(r6)
 3d4:   81 3d 00 04     lwz     r9,4(r29)
 3d8:   91 26 00 b8     stw     r9,184(r6)

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/06def97e87ac1c4ae8e3197e0982e1fab7b3c8ae.1597770847.git.christophe.leroy@csgroup.eu

...

This commit is contained in:

Christophe Leroy 2020-08-18 17:19:33 +00:00 • committed by Michael Ellerman

parent 14026b94cc

commit de781ebdf6

1 changed files with 11 additions and 2 deletions

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arch/powerpc/kernel/signal_32.c

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