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From: Ard Biesheuvel <ardb+git@google.com>
To: linux-kernel@vger.kernel.org
Cc: Ard Biesheuvel <ardb@kernel.org>,
	Masahiro Yamada <masahiroy@kernel.org>,
	Arnd Bergmann <arnd@arndb.de>,
	 Martin KaFai Lau <martin.lau@linux.dev>,
	linux-arch@vger.kernel.org,  linux-kbuild@vger.kernel.org,
	bpf@vger.kernel.org
Subject: [PATCH 2/3] vmlinux: Avoid weak reference to notes section
Date: Fri, 29 Mar 2024 10:33:59 +0100	[thread overview]
Message-ID: <20240329093356.276289-7-ardb+git@google.com> (raw)
In-Reply-To: <20240329093356.276289-5-ardb+git@google.com>

From: Ard Biesheuvel <ardb@kernel.org>

Weak references are references that are permitted to remain unsatisfied
in the final link. This means they cannot be implemented using place
relative relocations, resulting in GOT entries when using position
independent code generation.

The notes section should always exist, so the weak annotations can be
omitted.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 kernel/ksysfs.c | 4 ++--
 lib/buildid.c   | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
index 495b69a71a5d..07fb5987b42b 100644
--- a/kernel/ksysfs.c
+++ b/kernel/ksysfs.c
@@ -228,8 +228,8 @@ KERNEL_ATTR_RW(rcu_normal);
 /*
  * Make /sys/kernel/notes give the raw contents of our kernel .notes section.
  */
-extern const void __start_notes __weak;
-extern const void __stop_notes __weak;
+extern const void __start_notes;
+extern const void __stop_notes;
 #define	notes_size (&__stop_notes - &__start_notes)
 
 static ssize_t notes_read(struct file *filp, struct kobject *kobj,
diff --git a/lib/buildid.c b/lib/buildid.c
index 898301b49eb6..7954dd92e36c 100644
--- a/lib/buildid.c
+++ b/lib/buildid.c
@@ -182,8 +182,8 @@ unsigned char vmlinux_build_id[BUILD_ID_SIZE_MAX] __ro_after_init;
  */
 void __init init_vmlinux_build_id(void)
 {
-	extern const void __start_notes __weak;
-	extern const void __stop_notes __weak;
+	extern const void __start_notes;
+	extern const void __stop_notes;
 	unsigned int size = &__stop_notes - &__start_notes;
 
 	build_id_parse_buf(&__start_notes, vmlinux_build_id, size);
-- 
2.44.0.478.gd926399ef9-goog


  parent reply	other threads:[~2024-03-29  9:34 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-03-29  9:33 [PATCH 0/3] kbuild: Avoid weak external linkage where possible Ard Biesheuvel
2024-03-29  9:33 ` [PATCH 1/3] kallsyms: Avoid weak references for kallsyms symbols Ard Biesheuvel
2024-03-29  9:33 ` Ard Biesheuvel [this message]
2024-03-29  9:34 ` [PATCH 3/3] btf: Avoid weak external references Ard Biesheuvel
2024-03-29 18:24   ` Andrii Nakryiko
2024-04-02  7:09     ` Ard Biesheuvel

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