powerpc/signal64: use get_user() for the single context reads

swapcontext and rt_sigreturn read the signal mask with
__get_user_sigset(), and rt_sigreturn also reads the MSR and uc_link
words of the transactional-memory path, each with one __get_user()
after an access_ok() on the whole context.

Make the helper get_user_sigset(), built on get_user(), and use
get_user() for the other two.  On powerpc __get_user() already does
might_fault() and opens user access for the read itself, so the only
difference is the address check, which these pointers pass anyway.

This is part of getting rid of __get_user() and __put_user() entirely.

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

0 files changed, 0 insertions, 0 deletions