The code pattern for masked user access is unwieldy.
Add a new wrapper masked_user_read_access_begin() to simplify it.
Add the equivalent write wrapper.

Change fs/select.c to use the new wrappers when reading the
sigset_argpack and when writing out the result of poll.

The futex code could also be changed.

Note that this might conflict with the patch to change
get_sigset_argpack to __always_inline.

David Laight (2):
  uaccess: Simplify code pattern for masked user copies
  fs: Use masked_user_read_access_begin()

 fs/select.c             |  8 +++-----
 include/linux/uaccess.h | 21 +++++++++++++++++++++
 2 files changed, 24 insertions(+), 5 deletions(-)

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2.39.5