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math64, timers: Fix 32bit mul_u64_u32_shr() and friends

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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 <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Acked-by: Chris Metcalf <[email protected]> [for tile]
Cc: Christopher S. Hall <[email protected]>
Cc: David Gibson <[email protected]>
Cc: John Stultz <[email protected]>
Cc: Laurent Vivier <[email protected]>
Cc: Liav Rehana <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Parit Bhargava <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Richard Cochran <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Peter Zijlstra 2016-12-09 09:30:11 +01:00 • committed by Ingo Molnar
commit 9e3d6223d2
4 changed files with 43 additions and 9 deletions
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1
arch/tile/include/asm/Kbuild
View file

@ -5,7 +5,6 @@ generic-y += bug.h
generic-y += bugs.h
generic-y += clkdev.h
generic-y += cputime.h
generic-y += div64.h
generic-y += emergency-restart.h
generic-y += errno.h
generic-y += exec.h

14
arch/tile/include/asm/div64.h Normal file
View file

@ -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 */