[RFC 24/31] objtool: Make STACK_FRAME_NON_STANDARD consistent

[Josh Poimboeuf]

The C version of STACK_FRAME_NON_STANDARD differs from its asm
counterpart:

- it uses an 8-byte entry (vs 4-byte)
- it creates a superfluous temporary variable

Make it identical to the asm version.

Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
---
 include/linux/objtool.h | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/include/linux/objtool.h b/include/linux/objtool.h
index b3b8d3dab52d..5e66b6d26df5 100644
--- a/include/linux/objtool.h
+++ b/include/linux/objtool.h
@@ -30,9 +30,10 @@
  *
  * For more information, see tools/objtool/Documentation/objtool.txt.
  */
-#define STACK_FRAME_NON_STANDARD(func) \
-	static void __used __section(".discard.func_stack_frame_non_standard") \
-		*__func_stack_frame_non_standard_##func = func
+#define STACK_FRAME_NON_STANDARD(func)						\
+	asm(".pushsection .discard.func_stack_frame_non_standard, \"aw\"\n\t"	\
+	    ".long " __stringify(func) " - .\n\t"						\
+	    ".popsection")
 
 /*
  * STACK_FRAME_NON_STANDARD_FP() is a frame-pointer-specific function ignore
-- 
2.45.2