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author | Christoph Lameter <clameter@sgi.com> | 2008-04-28 02:12:44 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-28 08:58:21 -0700 |
commit | 1cdf25d704f7951d02a04064c97db547d6021872 (patch) | |
tree | 2571b70c1d95ea66086500b362a0f7fe2999acbc /kernel | |
parent | 308c05e35e3517d19bb67a7e97772235c9e15cd7 (diff) | |
download | linux-1cdf25d704f7951d02a04064c97db547d6021872.tar.gz linux-1cdf25d704f7951d02a04064c97db547d6021872.tar.bz2 linux-1cdf25d704f7951d02a04064c97db547d6021872.zip |
kbuild: create a way to create preprocessor constants from C expressions
The use of enums create constants that are not available to the preprocessor
when building the kernel (f.e. MAX_NR_ZONES).
Arch code already has a way to export constants calculated to the preprocessor
through the asm-offsets.c file. Generate something similar for the core
kernel through kbuild.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/bounds.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/kernel/bounds.c b/kernel/bounds.c new file mode 100644 index 000000000000..85bb281858cb --- /dev/null +++ b/kernel/bounds.c @@ -0,0 +1,19 @@ +/* + * Generate definitions needed by the preprocessor. + * This code generates raw asm output which is post-processed + * to extract and format the required data. + */ + +#define __GENERATING_BOUNDS_H +/* Include headers that define the enum constants of interest */ + +#define DEFINE(sym, val) \ + asm volatile("\n->" #sym " %0 " #val : : "i" (val)) + +#define BLANK() asm volatile("\n->" : : ) + +void foo(void) +{ + /* The enum constants to put into include/linux/bounds.h */ + /* End of constants */ +} |