From: Paul Menzel <pmenzel@xxxxxxxxxxxxx>
Subject: lib/zlib_inflate/inffast: check config in C to avoid unused function warning
Building Linux for ppc64le with Ubuntu clang version
12.0.0-3ubuntu1~21.04.1 shows the warning below.
arch/powerpc/boot/inffast.c:20:1: warning: unused function 'get_unaligned16' [-Wunused-function]
get_unaligned16(const unsigned short *p)
^
1 warning generated.
Fix it, by moving the check from the preprocessor to C, so the compiler
sees the use.
Link: https://lkml.kernel.org/r/20210920084332.5752-1-pmenzel@xxxxxxxxxxxxx
Signed-off-by: Paul Menzel <pmenzel@xxxxxxxxxxxxx>
Reviewed-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Tested-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Cc: Zhen Lei <thunder.leizhen@xxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/zlib_inflate/inffast.c | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
--- a/lib/zlib_inflate/inffast.c~lib-zlib_inflate-inffast-check-config-in-c-to-avoid-unused-function-warning
+++ a/lib/zlib_inflate/inffast.c
@@ -253,13 +253,12 @@ void inflate_fast(z_streamp strm, unsign
sfrom = (unsigned short *)(from);
loops = len >> 1;
- do
-#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
- *sout++ = *sfrom++;
-#else
- *sout++ = get_unaligned16(sfrom++);
-#endif
- while (--loops);
+ do {
+ if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS))
+ *sout++ = *sfrom++;
+ else
+ *sout++ = get_unaligned16(sfrom++);
+ } while (--loops);
out = (unsigned char *)sout;
from = (unsigned char *)sfrom;
} else { /* dist == 1 or dist == 2 */
_
