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kexec: take the segment adding out of locate_mem_hole functions 

In locate_mem_hole functions, a memory hole is located and added as
kexec_segment.  But from the name of locate_mem_hole, it should only take
responsibility of searching a available memory hole to contain data of a
specified size.

So in this patch add a new field 'mem' into kexec_buf, then take that
kexec segment adding code out of locate_mem_hole_top_down and
locate_mem_hole_bottom_up.  This make clear of the functionality of
locate_mem_hole just like it declars to do.  And by this
locate_mem_hole_callback chould be used later if anyone want to locate a
memory hole for other use.

Meanwhile Vivek suggested opening code function __kexec_add_segment(),
that way we have to retreive ksegment pointer once and it is easy to read.
 So just do it in this patch and remove __kexec_add_segment() since no one
use it anymore.

Signed-off-by: Baoquan He <bhe@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Baoquan He 2014-10-13 15:53:40 -07:00 committed by Linus Torvalds
parent 887f4f8666
commit 669280a152
2 changed files with 9 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/kexec.h
View File

@ -178,6 +178,7 @@ struct kexec_buf {
struct kimage *image;
char *buffer;
unsigned long bufsz;
unsigned long mem;
unsigned long memsz;
unsigned long buf_align;
unsigned long buf_min;

29
kernel/kexec.c
View File

@ -2016,22 +2016,6 @@ static int __init crash_save_vmcoreinfo_init(void)
subsys_initcall(crash_save_vmcoreinfo_init);
#ifdef CONFIG_KEXEC_FILE
static int __kexec_add_segment(struct kimage *image, char *buf,
unsigned long bufsz, unsigned long mem,
unsigned long memsz)
{
struct kexec_segment *ksegment;
ksegment = &image->segment[image->nr_segments];
ksegment->kbuf = buf;
ksegment->bufsz = bufsz;
ksegment->mem = mem;
ksegment->memsz = memsz;
image->nr_segments++;
return 0;
}
static int locate_mem_hole_top_down(unsigned long start, unsigned long end,
struct kexec_buf *kbuf)
{
@ -2064,8 +2048,7 @@ static int locate_mem_hole_top_down(unsigned long start, unsigned long end,
} while (1);
/* If we are here, we found a suitable memory range */
__kexec_add_segment(image, kbuf->buffer, kbuf->bufsz, temp_start,
kbuf->memsz);
kbuf->mem = temp_start;
/* Success, stop navigating through remaining System RAM ranges */
return 1;
@ -2099,8 +2082,7 @@ static int locate_mem_hole_bottom_up(unsigned long start, unsigned long end,
} while (1);
/* If we are here, we found a suitable memory range */
__kexec_add_segment(image, kbuf->buffer, kbuf->bufsz, temp_start,
kbuf->memsz);
kbuf->mem = temp_start;
/* Success, stop navigating through remaining System RAM ranges */
return 1;
@ -2187,7 +2169,12 @@ int kexec_add_buffer(struct kimage *image, char *buffer, unsigned long bufsz,
}
/* Found a suitable memory range */
ksegment = &image->segment[image->nr_segments - 1];
ksegment = &image->segment[image->nr_segments];
ksegment->kbuf = kbuf->buffer;
ksegment->bufsz = kbuf->bufsz;
ksegment->mem = kbuf->mem;
ksegment->memsz = kbuf->memsz;
image->nr_segments++;
*load_addr = ksegment->mem;
return 0;
}