From d29d64afa2b20d9bd210c01bfff78545675b5135 Mon Sep 17 00:00:00 2001 From: Petr Pavlu Date: Wed, 18 Jun 2025 14:50:35 +0200 Subject: [PATCH] codetag: avoid unused alloc_tags sections/symbols 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. Link: https://lkml.kernel.org/r/20250618125037.53182-1-petr.pavlu@suse.com Signed-off-by: Petr Pavlu Reviewed-by: Kent Overstreet Reviewed-by: Suren Baghdasaryan Cc: Arnd Bergmann Cc: Casey Chen Cc: Petr Pavlu Signed-off-by: Andrew Morton --- 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 a45fe3d141a18..a14f4bdafddae 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 */ -- 2.47.2