[PATCH] x86: comment magic constants in delay.h
For both i386 and x86_64, copy from arch/$ARCH/lib/delay.c comments about the used magic constants, plus a few other niceties. Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andi Kleen <ak@suse.de> include/asm-i386/delay.h | 5 ++++- include/asm-x86_64/delay.h | 5 ++++- 2 files changed, 8 insertions(+), 2 deletions(-)
This commit is contained in:
parent
b9a8d94a47
commit
e6536c1262
2 changed files with 8 additions and 2 deletions
|
@ -7,6 +7,7 @@
|
|||
* Delay routines calling functions in arch/i386/lib/delay.c
|
||||
*/
|
||||
|
||||
/* Undefined functions to get compile-time errors */
|
||||
extern void __bad_udelay(void);
|
||||
extern void __bad_ndelay(void);
|
||||
|
||||
|
@ -15,10 +16,12 @@ extern void __ndelay(unsigned long nsecs);
|
|||
extern void __const_udelay(unsigned long usecs);
|
||||
extern void __delay(unsigned long loops);
|
||||
|
||||
/* 0x10c7 is 2**32 / 1000000 (rounded up) */
|
||||
#define udelay(n) (__builtin_constant_p(n) ? \
|
||||
((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c7ul)) : \
|
||||
__udelay(n))
|
||||
|
||||
|
||||
/* 0x5 is 2**32 / 1000000000 (rounded up) */
|
||||
#define ndelay(n) (__builtin_constant_p(n) ? \
|
||||
((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) : \
|
||||
__ndelay(n))
|
||||
|
|
|
@ -7,18 +7,21 @@
|
|||
* Delay routines calling functions in arch/x86_64/lib/delay.c
|
||||
*/
|
||||
|
||||
/* Undefined functions to get compile-time errors */
|
||||
extern void __bad_udelay(void);
|
||||
extern void __bad_ndelay(void);
|
||||
|
||||
extern void __udelay(unsigned long usecs);
|
||||
extern void __ndelay(unsigned long usecs);
|
||||
extern void __ndelay(unsigned long nsecs);
|
||||
extern void __const_udelay(unsigned long usecs);
|
||||
extern void __delay(unsigned long loops);
|
||||
|
||||
/* 0x10c7 is 2**32 / 1000000 (rounded up) */
|
||||
#define udelay(n) (__builtin_constant_p(n) ? \
|
||||
((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c7ul)) : \
|
||||
__udelay(n))
|
||||
|
||||
/* 0x5 is 2**32 / 1000000000 (rounded up) */
|
||||
#define ndelay(n) (__builtin_constant_p(n) ? \
|
||||
((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) : \
|
||||
__ndelay(n))
|
||||
|
|
Loading…
Reference in a new issue