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| author | Chuck Ebbert <76306.1226@compuserve.com> | 2006-06-27 02:53:47 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-27 17:32:37 -0700 |
| commit | c723e084606ca1c81e91b80b2c0c44bde7bbc4df (patch) | |
| tree | c338f62586978093d7c6b85c3f783cb65879c1f1 /include/asm-i386/thread_info.h | |
| parent | 4b89aff930d632be10d557d08d1b60dee7163dbe (diff) | |
| download | linux-c723e084606ca1c81e91b80b2c0c44bde7bbc4df.tar.gz linux-c723e084606ca1c81e91b80b2c0c44bde7bbc4df.tar.bz2 linux-c723e084606ca1c81e91b80b2c0c44bde7bbc4df.zip | |
[PATCH] i386: use C code for current_thread_info()
Using C code for current_thread_info() lets the compiler optimize it.
With gcc 4.0.2, kernel is smaller:
text data bss dec hex filename
3645212 555556 312024 4512792 44dc18 2.6.17-rc6-nb-post/vmlinux
3647276 555556 312024 4514856 44e428 2.6.17-rc6-nb/vmlinux
-------
-2064
Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-i386/thread_info.h')
| -rw-r--r-- | include/asm-i386/thread_info.h | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/include/asm-i386/thread_info.h b/include/asm-i386/thread_info.h index fdbc7f422ea5..ff1e2b1a7c84 100644 --- a/include/asm-i386/thread_info.h +++ b/include/asm-i386/thread_info.h @@ -83,17 +83,15 @@ struct thread_info { #define init_stack (init_thread_union.stack) +/* how to get the current stack pointer from C */ +register unsigned long current_stack_pointer asm("esp") __attribute_used__; + /* how to get the thread information struct from C */ static inline struct thread_info *current_thread_info(void) { - struct thread_info *ti; - __asm__("andl %%esp,%0; ":"=r" (ti) : "0" (~(THREAD_SIZE - 1))); - return ti; + return (struct thread_info *)(current_stack_pointer & ~(THREAD_SIZE - 1)); } -/* how to get the current stack pointer from C */ -register unsigned long current_stack_pointer asm("esp") __attribute_used__; - /* thread information allocation */ #ifdef CONFIG_DEBUG_STACK_USAGE #define alloc_thread_info(tsk) \ |