The patch titled
i386: use C code for current_thread_info()
has been added to the -mm tree. Its filename is
i386-use-c-code-for-current_thread_info.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: use C code for current_thread_info()
From: Chuck Ebbert <76306.1226@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
include/asm-i386/thread_info.h | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff -puN include/asm-i386/thread_info.h~i386-use-c-code-for-current_thread_info include/asm-i386/thread_info.h
--- a/include/asm-i386/thread_info.h~i386-use-c-code-for-current_thread_info
+++ a/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) \
_
Patches currently in -mm which might be from 76306.1226@xxxxxxxxxxxxxx are
i386-let-usermode-execute-the-enter.patch
i386-fix-get_segment_eip-with-vm86.patch
i386-dont-try-kprobes-for-v8086-mode.patch
i386-print-stack-size-in-oops-messages.patch
i386-use-c-code-for-current_thread_info.patch
-
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