[PATCH v3 07/28] objtool: Make .discard.stack_frame_non_standard non-allocatable
From: Josh Poimboeuf <jpoimboe@kernel.org>
Date: 2026-09-21 22:31:40
Also in:
lkml, rust-for-linux
Subsystem:
objtool, the rest · Maintainers:
Josh Poimboeuf, Peter Zijlstra, Linus Torvalds
Convert STACK_FRAME_NON_STANDARD() to an asm macro to prevent it section from being allocatable. This will help it survive being used in libstub, which renames all allocatable sections. Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> --- include/linux/objtool.h | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/include/linux/objtool.h b/include/linux/objtool.h
index af2e68e496e5d..e9c78e026c7a3 100644
--- a/include/linux/objtool.h
+++ b/include/linux/objtool.h@@ -4,6 +4,7 @@ #include <linux/objtool_types.h> #include <linux/annotate.h> +#include <linux/compiler.h> #ifdef CONFIG_OBJTOOL
@@ -30,9 +31,11 @@ * * 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) \ + __ADDRESSABLE(func); \ + asm(".pushsection .discard.func_stack_frame_non_standard\n\t" \ + ".long " #func " - .\n\t" \ + ".popsection") /* * STACK_FRAME_NON_STANDARD_FP() is a frame-pointer-specific function ignore
@@ -91,8 +94,8 @@ .endm .macro STACK_FRAME_NON_STANDARD func:req - .pushsection .discard.func_stack_frame_non_standard, "aw" - .quad \func + .pushsection .discard.func_stack_frame_non_standard, "" + .long \func - . .popsection .endm
--
2.55.0