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Wed, 18 Jun 2025 05:50:54 -0700 (PDT) Received: from zovi.suse.cz ([193.86.92.181]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-453599c9854sm13143435e9.1.2025.06.18.05.50.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Jun 2025 05:50:53 -0700 (PDT) From: Petr Pavlu To: Andrew Morton Cc: Suren Baghdasaryan , Kent Overstreet , Arnd Bergmann , Casey Chen , linux-arch@vger.kernel.org, linux-modules@vger.kernel.org, linux-kernel@vger.kernel.org, Petr Pavlu Subject: [PATCH v2] codetag: Avoid unused alloc_tags sections/symbols Date: Wed, 18 Jun 2025 14:50:35 +0200 Message-ID: <20250618125037.53182-1-petr.pavlu@suse.com> X-Mailer: git-send-email 2.49.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" With CONFIG_MEM_ALLOC_PROFILING=3Dn, 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 Reviewed-by: Kent Overstreet Reviewed-by: Suren Baghdasaryan Acked-by: Suren Baghdasaryan --- 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.pavlu@suse.com/ [2] https://lore.kernel.org/all/20250610162258.324645-1-cachen@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/codeta= g.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 =20 +#ifdef CONFIG_MEM_ALLOC_PROFILING +#define IF_MEM_ALLOC_PROFILING(...) __VA_ARGS__ +#else +#define IF_MEM_ALLOC_PROFILING(...) +#endif + #define SECTION_WITH_BOUNDARIES(_name) \ . =3D ALIGN(8); \ __start_##_name =3D .; \ @@ -9,7 +15,7 @@ __stop_##_name =3D .; =20 #define CODETAG_SECTIONS() \ - SECTION_WITH_BOUNDARIES(alloc_tags) + IF_MEM_ALLOC_PROFILING(SECTION_WITH_BOUNDARIES(alloc_tags)) =20 #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)) =20 #endif /* __ASM_GENERIC_CODETAG_LDS_H */ base-commit: 52da431bf03b5506203bca27fe14a97895c80faf prerequisite-patch-id: acb6e2f6708cd75488806308bfecf682b2367dc9 --=20 2.49.0