x86/kexec: remove unnecessary arch_kexec_kernel_image_load()

Patch series "kexec: Remove unnecessary arch hook", v2.

There are no arch-specific things in arch_kexec_kernel_image_load(), so
remove it and just use the generic version.


This patch (of 2):

The x86 implementation of arch_kexec_kernel_image_load() is functionally
identical to the generic arch_kexec_kernel_image_load():

  arch_kexec_kernel_image_load                # x86
    if (!image->fops || !image->fops->load)
      return ERR_PTR(-ENOEXEC);
    return image->fops->load(image, image->kernel_buf, ...)

  arch_kexec_kernel_image_load                # generic
    kexec_image_load_default
      if (!image->fops || !image->fops->load)
	return ERR_PTR(-ENOEXEC);
      return image->fops->load(image, image->kernel_buf, ...)

Remove the x86-specific version and use the generic
arch_kexec_kernel_image_load().  No functional change intended.

Link: https://lkml.kernel.org/r/20230307224416.907040-1-helgaas@kernel.org
Link: https://lkml.kernel.org/r/20230307224416.907040-2-helgaas@kernel.orgSigned-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Acked-by: Baoquan He <bhe@redhat.com>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

arch/x86/include/asm/kexec.h

@@ -200,9 +200,6 @@ int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
 				     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

arch/x86/kernel/machine_kexec_64.c

@@ -374,17 +374,6 @@ void machine_kexec(struct kimage *image)
 /* arch-dependent functionality related to kexec file-based syscall */
 
 #ifdef CONFIG_KEXEC_FILE
-void *arch_kexec_kernel_image_load(struct kimage *image)
-{
-	if (!image->fops || !image->fops->load)
-		return ERR_PTR(-ENOEXEC);
-
-	return image->fops->load(image, image->kernel_buf,
-				 image->kernel_buf_len, image->initrd_buf,
-				 image->initrd_buf_len, image->cmdline_buf,
-				 image->cmdline_buf_len);
-}
-
 /*
  * Apply purgatory relocations.
  *

include/linux/kexec.h

@@ -207,12 +207,10 @@ static inline int arch_kimage_file_post_load_cleanup(struct kimage *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
 
 #ifdef CONFIG_KEXEC_SIG
 #ifdef CONFIG_SIGNED_PE_FILE_VERIFICATION