arm64: Fix compiler warning from pte_unmap() with -Wunused-but-set-variable
authorQian Cai <cai@lca.pw>
Mon, 29 Apr 2019 17:37:01 +0000 (13:37 -0400)
committerWill Deacon <will.deacon@arm.com>
Tue, 30 Apr 2019 10:58:28 +0000 (11:58 +0100)
commit74dd022f9e6260c3b5b8d15901d27ebcc5f21eda
tree5eb4eed2b2041390034ada64b7947d863a635c22
parent359db57c34af15edf35492944af4d4417f59886c
arm64: Fix compiler warning from pte_unmap() with -Wunused-but-set-variable

When building with -Wunused-but-set-variable, the compiler shouts about
a number of pte_unmap() users, since this expands to an empty macro on
arm64:

  | mm/gup.c: In function 'gup_pte_range':
  | mm/gup.c:1727:16: warning: variable 'ptem' set but not used
  | [-Wunused-but-set-variable]
  | mm/gup.c: At top level:
  | mm/memory.c: In function 'copy_pte_range':
  | mm/memory.c:821:24: warning: variable 'orig_dst_pte' set but not used
  | [-Wunused-but-set-variable]
  | mm/memory.c:821:9: warning: variable 'orig_src_pte' set but not used
  | [-Wunused-but-set-variable]
  | mm/swap_state.c: In function 'swap_ra_info':
  | mm/swap_state.c:641:15: warning: variable 'orig_pte' set but not used
  | [-Wunused-but-set-variable]
  | mm/madvise.c: In function 'madvise_free_pte_range':
  | mm/madvise.c:318:9: warning: variable 'orig_pte' set but not used
  | [-Wunused-but-set-variable]

Rewrite pte_unmap() as a static inline function, which silences the
warnings.

Signed-off-by: Qian Cai <cai@lca.pw>
Signed-off-by: Will Deacon <will.deacon@arm.com>
arch/arm64/include/asm/pgtable.h