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author | Arnd Bergmann <arnd@arndb.de> | 2017-07-19 14:53:01 +0200 |
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committer | Ingo Molnar <mingo@kernel.org> | 2017-07-20 10:46:24 +0200 |
commit | 5623452a0eaec1d44cc9f0770444a48847c9953f (patch) | |
tree | 83bd8824ec63c868493fc18135032896f2ce98ec | |
parent | 75e2f0a6b16141cb347f442033ec907380d4d66e (diff) | |
download | linux-5623452a0eaec1d44cc9f0770444a48847c9953f.tar.bz2 |
x86/fpu/math-emu: Avoid bogus -Wint-in-bool-context warning
gcc-7.1.1 produces this warning:
arch/x86/math-emu/reg_add_sub.c: In function 'FPU_add':
arch/x86/math-emu/reg_add_sub.c:80:48: error: ?: using integer constants in boolean context [-Werror=int-in-bool-context]
This appears to be a bug in gcc-7.1.1, and I have reported it as
PR81484. The compiler suggests that code written as
if (a & b ? c : d)
is usually incorrect and should have been
if (a & (b ? c : d))
However, in this case, we correctly write
if ((a & b) ? c : d)
and should not get a warning for it.
This adds a dirty workaround for the problem, adding a comparison with
zero inside of the macro. The warning is currently disabled in the kernel,
so we may decide not to apply the patch, and instead wait for future gcc
releases to fix the problem. On the other hand, it seems to be the
only instance of this particular problem.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Bill Metzenthen <billm@melbpc.org.au>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20170719125310.2487451-4-arnd@arndb.de
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81484
Signed-off-by: Ingo Molnar <mingo@kernel.org>
-rw-r--r-- | arch/x86/math-emu/fpu_emu.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/math-emu/fpu_emu.h b/arch/x86/math-emu/fpu_emu.h index afbc4d805d66..c9c320dccca1 100644 --- a/arch/x86/math-emu/fpu_emu.h +++ b/arch/x86/math-emu/fpu_emu.h @@ -157,7 +157,7 @@ extern u_char const data_sizes_16[32]; #define signbyte(a) (((u_char *)(a))[9]) #define getsign(a) (signbyte(a) & 0x80) -#define setsign(a,b) { if (b) signbyte(a) |= 0x80; else signbyte(a) &= 0x7f; } +#define setsign(a,b) { if ((b) != 0) signbyte(a) |= 0x80; else signbyte(a) &= 0x7f; } #define copysign(a,b) { if (getsign(a)) signbyte(b) |= 0x80; \ else signbyte(b) &= 0x7f; } #define changesign(a) { signbyte(a) ^= 0x80; } |