[PATCH] x86-64: reduce x86-64 bug frame by 4 bytes

As mentioned before, the size of the bug frame can be further reduced while
continuing to use instructions to encode the information.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 4 insertions, 6 deletions

diff --git a/include/asm-x86_64/bug.h b/include/asm-x86_64/bug.h
index eed785667289..80ac1fe966ac 100644
--- a/include/asm-x86_64/bug.h
+++ b/include/asm-x86_64/bug.h
@@ -9,10 +9,8 @@
  */
 struct bug_frame {
         unsigned char ud2[2];
-        unsigned char mov;
-        /* should use 32bit offset instead, but the assembler doesn't 
-           like it */
-        char *filename;
+        unsigned char push;
+        signed int filename;
         unsigned char ret;
         unsigned short line;
 } __attribute__((packed));
@@ -25,8 +23,8 @@ struct bug_frame {
    The magic numbers generate mov $64bitimm,%eax ; ret $offset. */
 #define BUG()                                                           \
         asm volatile(                                                   \
-        "ud2 ; .byte 0xa3 ; .quad %c1 ; .byte 0xc2 ; .short %c0" ::     \
-                     "i"(__LINE__), "i" (__stringify(__FILE__)))
+        "ud2 ; pushq $%c1 ; ret $%c0" ::                                \
+                     "i"(__LINE__), "i" (__FILE__))
 void out_of_line_bug(void);
 #else
 static inline void out_of_line_bug(void) { }