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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 <petr.pavlu@suse.com> Reviewed-by: Kent Overstreet <kent.overstreet@linux.dev> Reviewed-by: Suren Baghdasaryan <surenb@google.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Casey Chen <cachen@purestorage.com> Cc: Petr Pavlu <petr.pavlu@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
34 lines
935 B
C
34 lines
935 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef __ASM_GENERIC_CODETAG_LDS_H
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#define __ASM_GENERIC_CODETAG_LDS_H
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#ifdef CONFIG_MEM_ALLOC_PROFILING
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#define IF_MEM_ALLOC_PROFILING(...) __VA_ARGS__
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#else
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#define IF_MEM_ALLOC_PROFILING(...)
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#endif
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#define SECTION_WITH_BOUNDARIES(_name) \
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. = ALIGN(8); \
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__start_##_name = .; \
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KEEP(*(_name)) \
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__stop_##_name = .;
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#define CODETAG_SECTIONS() \
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IF_MEM_ALLOC_PROFILING(SECTION_WITH_BOUNDARIES(alloc_tags))
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#define MOD_SEPARATE_CODETAG_SECTION(_name) \
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.codetag.##_name : { \
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SECTION_WITH_BOUNDARIES(_name) \
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}
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/*
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* For codetags which might be used after module unload, therefore might stay
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* longer in memory. Each such codetag type has its own section so that we can
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* unload them individually once unused.
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*/
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#define MOD_SEPARATE_CODETAG_SECTIONS() \
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IF_MEM_ALLOC_PROFILING(MOD_SEPARATE_CODETAG_SECTION(alloc_tags))
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#endif /* __ASM_GENERIC_CODETAG_LDS_H */
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