x86/fpu: Clean up and rename variables in signal frame handling

Clean up signal frame handling code by renaming several variables for
clarity and consistency, and moving masking logic closer to its usage.

- Rename 'fxbuf' to 'buf_fx' in check_xstate_in_sigframe() for consistency.
- Rename label 'setfx' to 'err_setfx' in check_xstate_in_sigframe() to
  indicate it is an error path.
- In __restore_fpregs_from_user(), rename 'ufeatures' to 'task_xfeatures'
  and 'xrestore' to 'xrestore_mask'.
- Move the masking logic 'xrestore_mask &= task_xfeatures' from
  restore_fpregs_from_user() into __restore_fpregs_from_user().
- Rename 'xrestore' to 'xrestore_mask' in restore_fpregs_from_user() to
  match the name in __restore_fpregs_from_user() and __fpu_restore_sig().
- In __fpu_restore_sig(), rename 'buf' to 'buf_f' to distinguish it from
  'buf_fx', and 'user_xfeatures' to 'xrestore_mask'.

No functional changes.

Suggested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Andrei Vagin <avagin@google.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Alexander Mikhalitsyn <alexander@mihalicyn.com>
Link: https://patch.msgid.link/20260925162454.1403405-3-avagin@google.com

0 files changed, 0 insertions, 0 deletions