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[PATCH v8 03/13] kexec_file: Factor out kexec_locate_mem_hole from kexec_add_buffer.

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kexec_locate_mem_hole will be used by the PowerPC kexec_file_load
implementation to find free memory for the purgatory stack.

Signed-off-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Acked-by: Dave Young <dyoung@redhat.com>
---
 include/linux/kexec.h |  1 +
 kernel/kexec_file.c   | 25 ++++++++++++++++++++-----
 2 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index be39903edae1..d419d0e51fe5 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -176,6 +176,7 @@ struct kexec_buf {
 int __weak arch_kexec_walk_mem(struct kexec_buf *kbuf,
 			       int (*func)(u64, u64, void *));
 extern int kexec_add_buffer(struct kexec_buf *kbuf);
+int kexec_locate_mem_hole(struct kexec_buf *kbuf);
 #endif /* CONFIG_KEXEC_FILE */
 
 struct kimage {
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index efd2c094af7e..0c2df7f73792 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -450,6 +450,23 @@ int __weak arch_kexec_walk_mem(struct kexec_buf *kbuf,
 }
 
 /**
+ * kexec_locate_mem_hole - find free memory for the purgatory or the next kernel
+ * @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 kexec_locate_mem_hole(struct kexec_buf *kbuf)
+{
+	int ret;
+
+	ret = arch_kexec_walk_mem(kbuf, locate_mem_hole_callback);
+
+	return ret == 1 ? 0 : -EADDRNOTAVAIL;
+}
+
+/**
  * kexec_add_buffer - place a buffer in a kexec segment
  * @kbuf:	Buffer contents and memory parameters.
  *
@@ -489,11 +506,9 @@ int kexec_add_buffer(struct kexec_buf *kbuf)
 	kbuf->buf_align = max(kbuf->buf_align, PAGE_SIZE);
 
 	/* Walk the RAM ranges and allocate a suitable range for the buffer */
-	ret = arch_kexec_walk_mem(kbuf, locate_mem_hole_callback);
-	if (ret != 1) {
-		/* A suitable memory range could not be found for buffer */
-		return -EADDRNOTAVAIL;
-	}
+	ret = kexec_locate_mem_hole(kbuf);
+	if (ret)
+		return ret;
 
 	/* Found a suitable memory range */
 	ksegment = &kbuf->image->segment[kbuf->image->nr_segments];
-- 
1.9.1

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[PATCH v8 00/13] kexec_file_load implementation for PowerPC Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-09-06 00:30 +0200
  [PATCH v8 07/13] powerpc: Adapt elf64_apply_relocate_add for kexec_file_load. Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-09-06 00:30 +0200
  [PATCH v8 01/13] kexec_file: Allow arch-specific memory walking for kexec_add_buffer Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-09-06 00:30 +0200
  [PATCH v8 02/13] kexec_file: Change kexec_add_buffer to take kexec_buf as argument. Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-09-06 00:30 +0200
  [PATCH v8 13/13] powerpc: Enable CONFIG_KEXEC_FILE in powerpc server defconfigs. Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-09-06 00:30 +0200
  [PATCH v8 12/13] powerpc: Add purgatory for kexec_file_load implementation. Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-09-06 00:30 +0200
  [PATCH v8 11/13] powerpc: Add support for loading ELF kernels with kexec_file_load. Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-09-06 00:30 +0200
  [PATCH v8 08/13] powerpc: Add functions to read ELF files of any endianness. Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-09-06 00:30 +0200
  [PATCH v8 10/13] powerpc: Add code to work with device trees in kexec_file_load. Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-09-06 00:30 +0200
  [PATCH v8 03/13] kexec_file: Factor out kexec_locate_mem_hole from kexec_add_buffer. Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-09-06 00:30 +0200
  [PATCH v8 04/13] powerpc: Change places using CONFIG_KEXEC to use CONFIG_KEXEC_CORE instead. Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-09-06 00:30 +0200
  [PATCH v8 09/13] powerpc: Implement kexec_file_load. Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-09-06 00:30 +0200
  [PATCH v8 05/13] powerpc: Factor out relocation code from module_64.c to elf_util_64.c. Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-09-06 00:30 +0200
  [PATCH v8 06/13] powerpc: Generalize elf64_apply_relocate_add. Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-09-06 00:30 +0200

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