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| author | Peter Zijlstra <peterz@infradead.org> | 2016-12-09 09:30:11 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-01-14 11:31:50 +0100 |
| commit | 9e3d6223d2093a8903c8f570a06284453ee59944 (patch) | |
| tree | f6010d541488db907e3fbf0ab56d595694b12c79 /arch/tile/include/asm/div64.h | |
| parent | e96f8f18c81b2f5b290206fc0da74b551e82646d (diff) | |
| download | linux-stable-9e3d6223d2093a8903c8f570a06284453ee59944.tar.gz linux-stable-9e3d6223d2093a8903c8f570a06284453ee59944.tar.bz2 linux-stable-9e3d6223d2093a8903c8f570a06284453ee59944.zip | |
math64, timers: Fix 32bit mul_u64_u32_shr() and friends
It turns out that while GCC-4.4 manages to generate 32x32->64 mult
instructions for the 32bit mul_u64_u32_shr() code, any GCC after that
fails horribly.
Fix this by providing an explicit mul_u32_u32() function which can be
architcture provided.
Reported-by: Chris Metcalf <cmetcalf@mellanox.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Chris Metcalf <cmetcalf@mellanox.com> [for tile]
Cc: Christopher S. Hall <christopher.s.hall@intel.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Laurent Vivier <lvivier@redhat.com>
Cc: Liav Rehana <liavr@mellanox.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Parit Bhargava <prarit@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20161209083011.GD15765@worktop.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/tile/include/asm/div64.h')
| -rw-r--r-- | arch/tile/include/asm/div64.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/tile/include/asm/div64.h b/arch/tile/include/asm/div64.h new file mode 100644 index 000000000000..bf6161966dfa --- /dev/null +++ b/arch/tile/include/asm/div64.h @@ -0,0 +1,14 @@ +#ifndef _ASM_TILE_DIV64_H +#define _ASM_TILE_DIV64_H + +#ifdef __tilegx__ +static inline u64 mul_u32_u32(u32 a, u32 b) +{ + return __insn_mul_lu_lu(a, b); +} +#define mul_u32_u32 mul_u32_u32 +#endif + +#include <asm-generic/div64.h> + +#endif /* _ASM_TILE_DIV64_H */ |