diff options
| author | Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> | 2007-03-29 01:26:11 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-04-06 03:43:12 -0700 |
| commit | 16ad6a9070a33c1a624ace8880dd92803228a73d (patch) | |
| tree | 7b09a9ea9561f3d54c8d2c5d15902e64f76c4e65 | |
| parent | 93420eaf5b7ef59dc1de112419f854741d06bc66 (diff) | |
uml: fix unreasonably long udelay
Currently we have a confused udelay implementation.
* __const_udelay does not accept usecs but xloops in i386 and x86_64
* our implementation requires usecs as arg
* it gets a xloops count when called by asm/arch/delay.h
Bugs related to this (extremely long shutdown times) where reported by some
x86_64 users, especially using Device Mapper.
To hit this bug, a compile-time constant time parameter must be passed - that's
why UML seems to work most times.
Fix this with a simple udelay implementation.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | arch/um/sys-i386/delay.c | 11 | ||||
| -rw-r--r-- | arch/um/sys-x86_64/delay.c | 11 | ||||
| -rw-r--r-- | include/asm-um/delay.h | 17 |
3 files changed, 14 insertions, 25 deletions
diff --git a/arch/um/sys-i386/delay.c b/arch/um/sys-i386/delay.c index 2c11b9770e8b..d623e074f41d 100644 --- a/arch/um/sys-i386/delay.c +++ b/arch/um/sys-i386/delay.c @@ -27,14 +27,3 @@ void __udelay(unsigned long usecs) } EXPORT_SYMBOL(__udelay); - -void __const_udelay(unsigned long usecs) -{ - int i, n; - - n = (loops_per_jiffy * HZ * usecs) / MILLION; - for(i=0;i<n;i++) - cpu_relax(); -} - -EXPORT_SYMBOL(__const_udelay); diff --git a/arch/um/sys-x86_64/delay.c b/arch/um/sys-x86_64/delay.c index 137f4446b439..dee5be66da82 100644 --- a/arch/um/sys-x86_64/delay.c +++ b/arch/um/sys-x86_64/delay.c @@ -28,14 +28,3 @@ void __udelay(unsigned long usecs) } EXPORT_SYMBOL(__udelay); - -void __const_udelay(unsigned long usecs) -{ - unsigned long i, n; - - n = (loops_per_jiffy * HZ * usecs) / MILLION; - for(i=0;i<n;i++) - cpu_relax(); -} - -EXPORT_SYMBOL(__const_udelay); diff --git a/include/asm-um/delay.h b/include/asm-um/delay.h index 0985bda66750..c71e32b6741e 100644 --- a/include/asm-um/delay.h +++ b/include/asm-um/delay.h @@ -1,9 +1,20 @@ #ifndef __UM_DELAY_H #define __UM_DELAY_H -#include "asm/arch/delay.h" -#include "asm/archparam.h" - #define MILLION 1000000 +/* Undefined on purpose */ +extern void __bad_udelay(void); + +extern void __udelay(unsigned long usecs); +extern void __delay(unsigned long loops); + +#define udelay(n) ((__builtin_constant_p(n) && (n) > 20000) ? \ + __bad_udelay() : __udelay(n)) + +/* It appears that ndelay is not used at all for UML, and has never been + * implemented. */ +extern void __unimplemented_ndelay(void); +#define ndelay(n) __unimplemented_ndelay() + #endif |