aboutsummaryrefslogtreecommitdiffstats
path: root/include/asm-x86_64
diff options
context:
space:
mode:
authorPaolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>2006-12-06 20:14:07 -0500
committerAndi Kleen <andi@basil.nowhere.org>2006-12-06 20:14:07 -0500
commite6536c1262c56d302e749ab1b44fdb0b9786327d (patch)
tree6463b5c2eb8b156a6fcfffa283a803c0f8a8949b /include/asm-x86_64
parentb9a8d94a47f8a41766f6f7944adfb1d641349903 (diff)
[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(-)
Diffstat (limited to 'include/asm-x86_64')
-rw-r--r--include/asm-x86_64/delay.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/include/asm-x86_64/delay.h b/include/asm-x86_64/delay.h
index 40146f611ccb..c2669f1f5529 100644
--- a/include/asm-x86_64/delay.h
+++ b/include/asm-x86_64/delay.h
@@ -7,18 +7,21 @@
7 * Delay routines calling functions in arch/x86_64/lib/delay.c 7 * Delay routines calling functions in arch/x86_64/lib/delay.c
8 */ 8 */
9 9
10/* Undefined functions to get compile-time errors */
10extern void __bad_udelay(void); 11extern void __bad_udelay(void);
11extern void __bad_ndelay(void); 12extern void __bad_ndelay(void);
12 13
13extern void __udelay(unsigned long usecs); 14extern void __udelay(unsigned long usecs);
14extern void __ndelay(unsigned long usecs); 15extern void __ndelay(unsigned long nsecs);
15extern void __const_udelay(unsigned long usecs); 16extern void __const_udelay(unsigned long usecs);
16extern void __delay(unsigned long loops); 17extern void __delay(unsigned long loops);
17 18
19/* 0x10c7 is 2**32 / 1000000 (rounded up) */
18#define udelay(n) (__builtin_constant_p(n) ? \ 20#define udelay(n) (__builtin_constant_p(n) ? \
19 ((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c7ul)) : \ 21 ((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c7ul)) : \
20 __udelay(n)) 22 __udelay(n))
21 23
24/* 0x5 is 2**32 / 1000000000 (rounded up) */
22#define ndelay(n) (__builtin_constant_p(n) ? \ 25#define ndelay(n) (__builtin_constant_p(n) ? \
23 ((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) : \ 26 ((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) : \
24 __ndelay(n)) 27 __ndelay(n))