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| author | Gustavo A. R. Silva <gustavoars@kernel.org> | 2020-08-24 22:36:14 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-08-24 23:17:44 +0200 |
| commit | 6a9dc5fd6170d0a41c8a14eb19e63d94bea5705a (patch) | |
| tree | 7d33b5d3fa40ab47f2a5d711fc034a008cc9e83f /lib/vsprintf.c | |
| parent | Merge tag 'for-5.9-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/... (diff) | |
| download | linux-6a9dc5fd6170d0a41c8a14eb19e63d94bea5705a.tar.xz linux-6a9dc5fd6170d0a41c8a14eb19e63d94bea5705a.zip | |
lib: Revert use of fallthrough pseudo-keyword in lib/
The following build error for powerpc64 was reported by Nathan Chancellor:
"$ scripts/config --file arch/powerpc/configs/powernv_defconfig -e KERNEL_XZ
$ make -skj"$(nproc)" ARCH=powerpc CROSS_COMPILE=powerpc64le-linux- distclean powernv_defconfig zImage
...
In file included from arch/powerpc/boot/../../../lib/decompress_unxz.c:234,
from arch/powerpc/boot/decompress.c:38:
arch/powerpc/boot/../../../lib/xz/xz_dec_stream.c: In function 'dec_main':
arch/powerpc/boot/../../../lib/xz/xz_dec_stream.c:586:4: error: 'fallthrough' undeclared (first use in this function)
586 | fallthrough;
| ^~~~~~~~~~~
This will end up affecting distribution configurations such as Debian
and OpenSUSE according to my testing. I am not sure what the solution
is, the PowerPC wrapper does not set -D__KERNEL__ so I am not sure
that compiler_attributes.h can be safely included."
In order to avoid these sort of problems, it seems that the best
solution is to use /* fall through */ comments instead of the
fallthrough pseudo-keyword macro in lib/, for now.
Reported-by: Nathan Chancellor <natechancellor@gmail.com>
Fixes: df561f6688fe ("treewide: Use fallthrough pseudo-keyword")
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-and-tested-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/vsprintf.c')
| -rw-r--r-- | lib/vsprintf.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 19ebe1b257ec..afb9521ddf91 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -1265,7 +1265,7 @@ char *mac_address_string(char *buf, char *end, u8 *addr, case 'R': reversed = true; - fallthrough; + /* fall through */ default: separator = ':'; @@ -1682,7 +1682,7 @@ char *uuid_string(char *buf, char *end, const u8 *addr, switch (*(++fmt)) { case 'L': uc = true; - fallthrough; + /* fall through */ case 'l': index = guid_index; break; @@ -2219,7 +2219,7 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr, case 'S': case 's': ptr = dereference_symbol_descriptor(ptr); - fallthrough; + /* fall through */ case 'B': return symbol_string(buf, end, ptr, spec, fmt); case 'R': @@ -2450,7 +2450,7 @@ qualifier: case 'x': spec->flags |= SMALL; - fallthrough; + /* fall through */ case 'X': spec->base = 16; @@ -2468,7 +2468,7 @@ qualifier: * utility, treat it as any other invalid or * unsupported format specifier. */ - fallthrough; + /* fall through */ default: WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt); @@ -3411,10 +3411,10 @@ int vsscanf(const char *buf, const char *fmt, va_list args) break; case 'i': base = 0; - fallthrough; + /* fall through */ case 'd': is_sign = true; - fallthrough; + /* fall through */ case 'u': break; case '%': |