s390, kexec_file: drop arch_kexec_mem_walk()

Since s390 already knows where to locate buffers, calling arch_kexec_mem_walk() has no sense. So we can just drop it as kbuf->mem indicates this while all other architectures sets it to 0 initially. This change is a preparatory work for the next patch, where all the variant memory walks, either on system resource or memblock, will be put in one common place so that it will satisfy all the architectures' need. Signed-off-by: AKASHI Takahiro <[email protected]> Reviewed-by: Philipp Rudo <[email protected]> Cc: Martin Schwidefsky <[email protected]> Cc: Heiko Carstens <[email protected]> Cc: Dave Young <[email protected]> Cc: Vivek Goyal <[email protected]> Cc: Baoquan He <[email protected]> Signed-off-by: Will Deacon <[email protected]>
ambv · Dec 6, 2018 · b6664ba · b6664ba
1 parent 92a98a2
commit b6664ba
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Showing 3 changed files with 12 additions and 10 deletions.
diff --git a/arch/s390/kernel/machine_kexec_file.c b/arch/s390/kernel/machine_kexec_file.c
@@ -134,16 +134,6 @@ int kexec_file_add_initrd(struct kimage *image, struct s390_load_data *data,
 	return ret;
 }
 
-/*
- * The kernel is loaded to a fixed location. Turn off kexec_locate_mem_hole
- * and provide kbuf->mem by hand.
- */
-int arch_kexec_walk_mem(struct kexec_buf *kbuf,
-			int (*func)(struct resource *, void *))
-{
-	return 1;
-}
-
 int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
 				     Elf_Shdr *section,
 				     const Elf_Shdr *relsec,

diff --git a/include/linux/kexec.h b/include/linux/kexec.h
@@ -145,6 +145,14 @@ int kexec_image_probe_default(struct kimage *image, void *buf,
 			      unsigned long buf_len);
 int kexec_image_post_load_cleanup_default(struct kimage *image);
 
+/*
+ * If kexec_buf.mem is set to this value, kexec_locate_mem_hole()
+ * will try to allocate free memory. Arch may overwrite it.
+ */
+#ifndef KEXEC_BUF_MEM_UNKNOWN
+#define KEXEC_BUF_MEM_UNKNOWN 0
+#endif
+
 /**
  * struct kexec_buf - parameters for finding a place for a buffer in memory
  * @image:	kexec image in which memory to search.

diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
@@ -532,6 +532,10 @@ int kexec_locate_mem_hole(struct kexec_buf *kbuf)
 {
 	int ret;
 
+	/* Arch knows where to place */
+	if (kbuf->mem != KEXEC_BUF_MEM_UNKNOWN)
+		return 0;
+
 	ret = arch_kexec_walk_mem(kbuf, locate_mem_hole_callback);
 
 	return ret == 1 ? 0 : -EADDRNOTAVAIL;