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kexec_file: drop weak attribute from functions

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As requested
(http://lkml.kernel.org/r/87ee0q7b92.fsf@email.froward.int.ebiederm.org),
this series converts weak functions in kexec to use the #ifdef approach.

Quoting the 3e35142ef9 ("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@linux.vnet.ibm.com
Link: https://lkml.kernel.org/r/2cd7ca1fe4d6bb6ca38e3283c717878388ed6788.1656659357.git.naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Suggested-by: Eric Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Naveen N. Rao 2022-07-01 13:04:04 +05:30 committed by Mimi Zohar
parent c808a6ec71
commit 65d9a9a60f
6 changed files with 61 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/arm64/include/asm/kexec.h
View File

@ -115,7 +115,9 @@ extern const struct kexec_file_ops kexec_image_ops;
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,

9
arch/powerpc/include/asm/kexec.h
View File

@ -120,6 +120,15 @@ int setup_purgatory(struct kimage *image, const void *slave_code,
#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,

3
arch/s390/include/asm/kexec.h
View File

@ -92,5 +92,8 @@ int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
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 */

6
arch/x86/include/asm/kexec.h
View File

@ -193,6 +193,12 @@ int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
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

44
include/linux/kexec.h
View File

@ -188,21 +188,53 @@ int kexec_purgatory_get_set_symbol(struct kimage *image, const char *name,
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

35
kernel/kexec_file.c
View File

@ -62,14 +62,7 @@ int kexec_image_probe_default(struct kimage *image, void *buf,
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);
@ -80,11 +73,6 @@ static void *kexec_image_load_default(struct kimage *image)
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)
@ -93,11 +81,6 @@ int kexec_image_post_load_cleanup_default(struct kimage *image)
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)
@ -110,8 +93,7 @@ static int kexec_image_verify_sig_default(struct kimage *image, void *buf,
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);
}
@ -621,19 +603,6 @@ int kexec_locate_mem_hole(struct kexec_buf *kbuf)
return ret == 1 ? 0 : -EADDRNOTAVAIL;
}
/**
* 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.