The patch titled
i386, x86_64: comment magic constants in delay.h
has been added to the -mm tree. Its filename is
i386-x86_64-comment-magic-constants-in-delayh.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: i386, x86_64: comment magic constants in delay.h
From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@xxxxxxxx>
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@xxxxxxxx>
Cc: Andi Kleen <ak@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
include/asm-i386/delay.h | 5 ++++-
include/asm-x86_64/delay.h | 5 ++++-
2 files changed, 8 insertions(+), 2 deletions(-)
diff -puN include/asm-i386/delay.h~i386-x86_64-comment-magic-constants-in-delayh include/asm-i386/delay.h
--- a/include/asm-i386/delay.h~i386-x86_64-comment-magic-constants-in-delayh
+++ a/include/asm-i386/delay.h
@@ -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))
diff -puN include/asm-x86_64/delay.h~i386-x86_64-comment-magic-constants-in-delayh include/asm-x86_64/delay.h
--- a/include/asm-x86_64/delay.h~i386-x86_64-comment-magic-constants-in-delayh
+++ a/include/asm-x86_64/delay.h
@@ -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))
_
Patches currently in -mm which might be from blaisorblade@xxxxxxxx are
fix-remove-the-use-of-_syscallx-macros-in-uml.patch
uml-fix-compilation-options-for-user_objs.patch
uml-ubd-driver-allow-using-up-to-16-ubd-devices.patch
uml-ubd-driver-document-some-struct-fields.patch
uml-ubd-driver-var-renames.patch
uml-ubd-driver-give-better-names-to-some-functions.patch
uml-ubd-driver-change-ubd_lock-to-be-a-mutex.patch
uml-ubd-driver-ubd_io_lock-usage-fixup.patch
uml-ubd-driver-reformat-ubd_config.patch
uml-ubd-driver-convert-do_ubd-to-a-boolean-variable.patch
uml-ubd-driver-use-bitfields-where-possible.patch
uml-ubd-driver-do-not-store-error-codes-as-fd.patch
uml-ubd-driver-various-little-changes.patch
make-x86_64-udelay-round-up-instead-of-down.patch
i386-x86_64-comment-magic-constants-in-delayh.patch
uml-fix-prototypes.patch
uml-make-execvp-safe-for-our-usage.patch
-
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