With CONFIG_MEM_ALLOC_PROFILING=n, vmlinux and all modules unnecessarily contain the symbols __start_alloc_tags and __stop_alloc_tags, which define an empty range. In the case of modules, the presence of these symbols also forces the linker to create an empty .codetag.alloc_tags section.
Update codetag.lds.h to make the data conditional on CONFIG_MEM_ALLOC_PROFILING. Signed-off-by: Petr Pavlu <petr.pa...@suse.com> Reviewed-by: Kent Overstreet <kent.overstr...@linux.dev> Reviewed-by: Suren Baghdasaryan <sur...@google.com> --- Changes since v1 [1]: - Trivially rebased the patch on top of "alloc_tag: remove empty module tag section" [2]. [1] https://lore.kernel.org/all/20250313143002.9118-1-petr.pa...@suse.com/ [2] https://lore.kernel.org/all/20250610162258.324645-1-cac...@purestorage.com/ include/asm-generic/codetag.lds.h | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/include/asm-generic/codetag.lds.h b/include/asm-generic/codetag.lds.h index a45fe3d141a1..a14f4bdafdda 100644 --- a/include/asm-generic/codetag.lds.h +++ b/include/asm-generic/codetag.lds.h @@ -2,6 +2,12 @@ #ifndef __ASM_GENERIC_CODETAG_LDS_H #define __ASM_GENERIC_CODETAG_LDS_H +#ifdef CONFIG_MEM_ALLOC_PROFILING +#define IF_MEM_ALLOC_PROFILING(...) __VA_ARGS__ +#else +#define IF_MEM_ALLOC_PROFILING(...) +#endif + #define SECTION_WITH_BOUNDARIES(_name) \ . = ALIGN(8); \ __start_##_name = .; \ @@ -9,7 +15,7 @@ __stop_##_name = .; #define CODETAG_SECTIONS() \ - SECTION_WITH_BOUNDARIES(alloc_tags) + IF_MEM_ALLOC_PROFILING(SECTION_WITH_BOUNDARIES(alloc_tags)) #define MOD_SEPARATE_CODETAG_SECTION(_name) \ .codetag.##_name : { \ @@ -22,6 +28,6 @@ * unload them individually once unused. */ #define MOD_SEPARATE_CODETAG_SECTIONS() \ - MOD_SEPARATE_CODETAG_SECTION(alloc_tags) + IF_MEM_ALLOC_PROFILING(MOD_SEPARATE_CODETAG_SECTION(alloc_tags)) #endif /* __ASM_GENERIC_CODETAG_LDS_H */ base-commit: 52da431bf03b5506203bca27fe14a97895c80faf prerequisite-patch-id: acb6e2f6708cd75488806308bfecf682b2367dc9 -- 2.49.0
