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| author | Andrew Morton <akpm@linux-foundation.org> | 2008-03-04 14:28:45 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-03-04 16:35:12 -0800 |
| commit | 5cba6d22e35a05adb28fdea191b232501518c455 (patch) | |
| tree | 65ebdb01d81cbe218cbdedc6e52f759a1b18cc0a /include | |
| parent | daa49ff50a0cd1ddf88019e9afc41e26640ab1c4 (diff) | |
| download | linux-5cba6d22e35a05adb28fdea191b232501518c455.tar.bz2 | |
ndelay(): switch to C function to avoid 64-bit division
We should be able to do ndelay(some_u64), but that can cause a call to
__divdi3() to be emitted because the ndelay() macros does a divide.
Fix it by switching to static inline which will force the u64 arg to be
treated as an unsigned long. udelay() takes an unsigned long arg.
[bunk@kernel.org: reported m68k build breakage]
Cc: Adrian Bunk <bunk@kernel.org>
Cc: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Cc: Martin Michlmayr <tbm@cyrius.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/delay.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/delay.h b/include/linux/delay.h index 17ddb55430ae..54552d21296e 100644 --- a/include/linux/delay.h +++ b/include/linux/delay.h @@ -7,6 +7,8 @@ * Delay routines, using a pre-computed "loops_per_jiffy" value. */ +#include <linux/kernel.h> + extern unsigned long loops_per_jiffy; #include <asm/delay.h> @@ -32,7 +34,11 @@ extern unsigned long loops_per_jiffy; #endif #ifndef ndelay -#define ndelay(x) udelay(((x)+999)/1000) +static inline void ndelay(unsigned long x) +{ + udelay(DIV_ROUND_UP(x, 1000)); +} +#define ndelay(x) ndelay(x) #endif void calibrate_delay(void); |