The patch titled
Subject: kexec_file: drop weak attribute from functions
has been added to the -mm mm-nonmm-unstable branch. Its filename is
kexec_file-drop-weak-attribute-from-functions.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kexec_file-drop-weak-attribute-from-functions.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Naveen N. Rao" <naveen.n.rao@xxxxxxxxxxxxxxxxxx>
Subject: kexec_file: drop weak attribute from functions
Date: Fri, 1 Jul 2022 13:04:04 +0530
As requested
(http://lkml.kernel.org/r/87ee0q7b92.fsf@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx),
this series converts weak functions in kexec to use the #ifdef approach.
Quoting the 3e35142ef99fe ("kexec_file: drop weak attribute from
arch_kexec_apply_relocations[_add]") changelog:
: Since commit d1bcae833b32f1 ("ELF: Don't generate unused section symbols")
: [1], binutils (v2.36+) started dropping section symbols that it thought
: were unused. This isn't an issue in general, but with kexec_file.c, gcc
: is placing kexec_arch_apply_relocations[_add] into a separate
: .text.unlikely section and the section symbol ".text.unlikely" is being
: dropped. Due to this, recordmcount is unable to find a non-weak symbol in
: .text.unlikely to generate a relocation record against.
This patch (of 2);
Drop __weak attribute from functions in kexec_file.c:
- arch_kexec_kernel_image_probe()
- arch_kimage_file_post_load_cleanup()
- arch_kexec_kernel_image_load()
- arch_kexec_locate_mem_hole()
- arch_kexec_kernel_verify_sig()
arch_kexec_kernel_image_load() calls into kexec_image_load_default(), so
drop the static attribute for the latter.
arch_kexec_kernel_verify_sig() is not overridden by any architecture, so
drop the __weak attribute.
Link: https://lkml.kernel.org/r/cover.1656659357.git.naveen.n.rao@xxxxxxxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/2cd7ca1fe4d6bb6ca38e3283c717878388ed6788.1656659357.git.naveen.n.rao@xxxxxxxxxxxxxxxxxx
Signed-off-by: Naveen N. Rao <naveen.n.rao@xxxxxxxxxxxxxxxxxx>
Suggested-by: Eric Biederman <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm64/include/asm/kexec.h | 4 +-
arch/powerpc/include/asm/kexec.h | 9 +++++
arch/s390/include/asm/kexec.h | 3 +
arch/x86/include/asm/kexec.h | 6 +++
include/linux/kexec.h | 44 +++++++++++++++++++++++++----
kernel/kexec_file.c | 35 +----------------------
6 files changed, 61 insertions(+), 40 deletions(-)
--- a/arch/arm64/include/asm/kexec.h~kexec_file-drop-weak-attribute-from-functions
+++ a/arch/arm64/include/asm/kexec.h
@@ -115,7 +115,9 @@ extern const struct kexec_file_ops kexec
struct kimage;
-extern int arch_kimage_file_post_load_cleanup(struct kimage *image);
+int arch_kimage_file_post_load_cleanup(struct kimage *image);
+#define arch_kimage_file_post_load_cleanup arch_kimage_file_post_load_cleanup
+
extern int load_other_segments(struct kimage *image,
unsigned long kernel_load_addr, unsigned long kernel_size,
char *initrd, unsigned long initrd_len,
--- a/arch/powerpc/include/asm/kexec.h~kexec_file-drop-weak-attribute-from-functions
+++ a/arch/powerpc/include/asm/kexec.h
@@ -120,6 +120,15 @@ int setup_purgatory(struct kimage *image
#ifdef CONFIG_PPC64
struct kexec_buf;
+int arch_kexec_kernel_image_probe(struct kimage *image, void *buf, unsigned long buf_len);
+#define arch_kexec_kernel_image_probe arch_kexec_kernel_image_probe
+
+int arch_kimage_file_post_load_cleanup(struct kimage *image);
+#define arch_kimage_file_post_load_cleanup arch_kimage_file_post_load_cleanup
+
+int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf);
+#define arch_kexec_locate_mem_hole arch_kexec_locate_mem_hole
+
int load_crashdump_segments_ppc64(struct kimage *image,
struct kexec_buf *kbuf);
int setup_purgatory_ppc64(struct kimage *image, const void *slave_code,
--- a/arch/s390/include/asm/kexec.h~kexec_file-drop-weak-attribute-from-functions
+++ a/arch/s390/include/asm/kexec.h
@@ -92,5 +92,8 @@ int arch_kexec_apply_relocations_add(str
const Elf_Shdr *relsec,
const Elf_Shdr *symtab);
#define arch_kexec_apply_relocations_add arch_kexec_apply_relocations_add
+
+int arch_kimage_file_post_load_cleanup(struct kimage *image);
+#define arch_kimage_file_post_load_cleanup arch_kimage_file_post_load_cleanup
#endif
#endif /*_S390_KEXEC_H */
--- a/arch/x86/include/asm/kexec.h~kexec_file-drop-weak-attribute-from-functions
+++ a/arch/x86/include/asm/kexec.h
@@ -193,6 +193,12 @@ int arch_kexec_apply_relocations_add(str
const Elf_Shdr *relsec,
const Elf_Shdr *symtab);
#define arch_kexec_apply_relocations_add arch_kexec_apply_relocations_add
+
+void *arch_kexec_kernel_image_load(struct kimage *image);
+#define arch_kexec_kernel_image_load arch_kexec_kernel_image_load
+
+int arch_kimage_file_post_load_cleanup(struct kimage *image);
+#define arch_kimage_file_post_load_cleanup arch_kimage_file_post_load_cleanup
#endif
#endif
--- a/include/linux/kexec.h~kexec_file-drop-weak-attribute-from-functions
+++ a/include/linux/kexec.h
@@ -188,21 +188,53 @@ int kexec_purgatory_get_set_symbol(struc
void *buf, unsigned int size,
bool get_value);
void *kexec_purgatory_get_symbol_addr(struct kimage *image, const char *name);
+void *kexec_image_load_default(struct kimage *image);
+
+#ifndef arch_kexec_kernel_image_probe
+static inline int
+arch_kexec_kernel_image_probe(struct kimage *image, void *buf, unsigned long buf_len)
+{
+ return kexec_image_probe_default(image, buf, buf_len);
+}
+#endif
+
+#ifndef arch_kimage_file_post_load_cleanup
+static inline int arch_kimage_file_post_load_cleanup(struct kimage *image)
+{
+ return kexec_image_post_load_cleanup_default(image);
+}
+#endif
+
+#ifndef arch_kexec_kernel_image_load
+static inline void *arch_kexec_kernel_image_load(struct kimage *image)
+{
+ return kexec_image_load_default(image);
+}
+#endif
-/* Architectures may override the below functions */
-int arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
- unsigned long buf_len);
-void *arch_kexec_kernel_image_load(struct kimage *image);
-int arch_kimage_file_post_load_cleanup(struct kimage *image);
#ifdef CONFIG_KEXEC_SIG
int arch_kexec_kernel_verify_sig(struct kimage *image, void *buf,
unsigned long buf_len);
#endif
-int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf);
extern int kexec_add_buffer(struct kexec_buf *kbuf);
int kexec_locate_mem_hole(struct kexec_buf *kbuf);
+#ifndef arch_kexec_locate_mem_hole
+/**
+ * arch_kexec_locate_mem_hole - Find free memory to place the segments.
+ * @kbuf: Parameters for the memory search.
+ *
+ * On success, kbuf->mem will have the start address of the memory region found.
+ *
+ * Return: 0 on success, negative errno on error.
+ */
+static inline int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf)
+{
+ return kexec_locate_mem_hole(kbuf);
+}
+#endif
+
/* Alignment required for elf header segment */
#define ELF_CORE_HEADER_ALIGN 4096
--- a/kernel/kexec_file.c~kexec_file-drop-weak-attribute-from-functions
+++ a/kernel/kexec_file.c
@@ -56,14 +56,7 @@ int kexec_image_probe_default(struct kim
return ret;
}
-/* Architectures can provide this probe function */
-int __weak arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
- unsigned long buf_len)
-{
- return kexec_image_probe_default(image, buf, buf_len);
-}
-
-static void *kexec_image_load_default(struct kimage *image)
+void *kexec_image_load_default(struct kimage *image)
{
if (!image->fops || !image->fops->load)
return ERR_PTR(-ENOEXEC);
@@ -74,11 +67,6 @@ static void *kexec_image_load_default(st
image->cmdline_buf_len);
}
-void * __weak arch_kexec_kernel_image_load(struct kimage *image)
-{
- return kexec_image_load_default(image);
-}
-
int kexec_image_post_load_cleanup_default(struct kimage *image)
{
if (!image->fops || !image->fops->cleanup)
@@ -87,11 +75,6 @@ int kexec_image_post_load_cleanup_defaul
return image->fops->cleanup(image->image_loader_data);
}
-int __weak arch_kimage_file_post_load_cleanup(struct kimage *image)
-{
- return kexec_image_post_load_cleanup_default(image);
-}
-
#ifdef CONFIG_KEXEC_SIG
static int kexec_image_verify_sig_default(struct kimage *image, void *buf,
unsigned long buf_len)
@@ -104,8 +87,7 @@ static int kexec_image_verify_sig_defaul
return image->fops->verify_sig(buf, buf_len);
}
-int __weak arch_kexec_kernel_verify_sig(struct kimage *image, void *buf,
- unsigned long buf_len)
+int arch_kexec_kernel_verify_sig(struct kimage *image, void *buf, unsigned long buf_len)
{
return kexec_image_verify_sig_default(image, buf, buf_len);
}
@@ -617,19 +599,6 @@ int kexec_locate_mem_hole(struct kexec_b
}
/**
- * arch_kexec_locate_mem_hole - Find free memory to place the segments.
- * @kbuf: Parameters for the memory search.
- *
- * On success, kbuf->mem will have the start address of the memory region found.
- *
- * Return: 0 on success, negative errno on error.
- */
-int __weak arch_kexec_locate_mem_hole(struct kexec_buf *kbuf)
-{
- return kexec_locate_mem_hole(kbuf);
-}
-
-/**
* kexec_add_buffer - place a buffer in a kexec segment
* @kbuf: Buffer contents and memory parameters.
*
_
Patches currently in -mm which might be from naveen.n.rao@xxxxxxxxxxxxxxxxxx are
kexec_file-drop-weak-attribute-from-functions.patch
kexec-drop-weak-attribute-from-functions.patch
