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authorVivek Goyal <vgoyal@redhat.com>2014-08-09 01:25:48 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-09 02:57:32 +0400
commit255aedd90e3e804fb52e1a71636a3b22cf12f81b (patch)
tree5b25989bec463c43a82d159c8b285fdbbb57eb03 /kernel/kexec.c
parentdabe78628dd886c4b71971d1d78f1cecc674b760 (diff)
downloadlinux-255aedd90e3e804fb52e1a71636a3b22cf12f81b.tar.xz
kexec: use common function for kimage_normal_alloc() and kimage_crash_alloc()
kimage_normal_alloc() and kimage_crash_alloc() are doing lot of similar things and differ only little. So instead of having two separate functions create a common function kimage_alloc_init() and pass it the "flags" argument which tells whether it is normal kexec or kexec_on_panic. And this function should be able to deal with both the cases. This consolidation also helps later where we can use a common function kimage_file_alloc_init() to handle normal and crash cases for new file based kexec syscall. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Cc: Borislav Petkov <bp@suse.de> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Eric Biederman <ebiederm@xmission.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Greg Kroah-Hartman <greg@kroah.com> Cc: Dave Young <dyoung@redhat.com> Cc: WANG Chao <chaowang@redhat.com> Cc: Baoquan He <bhe@redhat.com> Cc: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/kexec.c')
-rw-r--r--kernel/kexec.c105
1 files changed, 34 insertions, 71 deletions
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 062e5567750e..bfdda316697d 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -261,12 +261,20 @@ static struct kimage *do_kimage_alloc_init(void)
static void kimage_free_page_list(struct list_head *list);
-static int kimage_normal_alloc(struct kimage **rimage, unsigned long entry,
- unsigned long nr_segments,
- struct kexec_segment __user *segments)
+static int kimage_alloc_init(struct kimage **rimage, unsigned long entry,
+ unsigned long nr_segments,
+ struct kexec_segment __user *segments,
+ unsigned long flags)
{
- int result;
+ int ret;
struct kimage *image;
+ bool kexec_on_panic = flags & KEXEC_ON_CRASH;
+
+ if (kexec_on_panic) {
+ /* Verify we have a valid entry point */
+ if ((entry < crashk_res.start) || (entry > crashk_res.end))
+ return -EADDRNOTAVAIL;
+ }
/* Allocate and initialize a controlling structure */
image = do_kimage_alloc_init();
@@ -275,20 +283,26 @@ static int kimage_normal_alloc(struct kimage **rimage, unsigned long entry,
image->start = entry;
- result = copy_user_segment_list(image, nr_segments, segments);
- if (result)
+ ret = copy_user_segment_list(image, nr_segments, segments);
+ if (ret)
goto out_free_image;
- result = sanity_check_segment_list(image);
- if (result)
+ ret = sanity_check_segment_list(image);
+ if (ret)
goto out_free_image;
+ /* Enable the special crash kernel control page allocation policy. */
+ if (kexec_on_panic) {
+ image->control_page = crashk_res.start;
+ image->type = KEXEC_TYPE_CRASH;
+ }
+
/*
* Find a location for the control code buffer, and add it
* the vector of segments so that it's pages will also be
* counted as destination pages.
*/
- result = -ENOMEM;
+ ret = -ENOMEM;
image->control_code_page = kimage_alloc_control_pages(image,
get_order(KEXEC_CONTROL_PAGE_SIZE));
if (!image->control_code_page) {
@@ -296,10 +310,12 @@ static int kimage_normal_alloc(struct kimage **rimage, unsigned long entry,
goto out_free_image;
}
- image->swap_page = kimage_alloc_control_pages(image, 0);
- if (!image->swap_page) {
- pr_err("Could not allocate swap buffer\n");
- goto out_free_control_pages;
+ if (!kexec_on_panic) {
+ image->swap_page = kimage_alloc_control_pages(image, 0);
+ if (!image->swap_page) {
+ pr_err("Could not allocate swap buffer\n");
+ goto out_free_control_pages;
+ }
}
*rimage = image;
@@ -308,60 +324,7 @@ out_free_control_pages:
kimage_free_page_list(&image->control_pages);
out_free_image:
kfree(image);
- return result;
-}
-
-static int kimage_crash_alloc(struct kimage **rimage, unsigned long entry,
- unsigned long nr_segments,
- struct kexec_segment __user *segments)
-{
- int result;
- struct kimage *image;
-
- /* Verify we have a valid entry point */
- if ((entry < crashk_res.start) || (entry > crashk_res.end))
- return -EADDRNOTAVAIL;
-
- /* Allocate and initialize a controlling structure */
- image = do_kimage_alloc_init();
- if (!image)
- return -ENOMEM;
-
- image->start = entry;
-
- /* Enable the special crash kernel control page
- * allocation policy.
- */
- image->control_page = crashk_res.start;
- image->type = KEXEC_TYPE_CRASH;
-
- result = copy_user_segment_list(image, nr_segments, segments);
- if (result)
- goto out_free_image;
-
- result = sanity_check_segment_list(image);
- if (result)
- goto out_free_image;
-
- /*
- * Find a location for the control code buffer, and add
- * the vector of segments so that it's pages will also be
- * counted as destination pages.
- */
- result = -ENOMEM;
- image->control_code_page = kimage_alloc_control_pages(image,
- get_order(KEXEC_CONTROL_PAGE_SIZE));
- if (!image->control_code_page) {
- pr_err("Could not allocate control_code_buffer\n");
- goto out_free_image;
- }
-
- *rimage = image;
- return 0;
-
-out_free_image:
- kfree(image);
- return result;
+ return ret;
}
static int kimage_is_destination_range(struct kimage *image,
@@ -1004,16 +967,16 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments,
/* Loading another kernel to reboot into */
if ((flags & KEXEC_ON_CRASH) == 0)
- result = kimage_normal_alloc(&image, entry,
- nr_segments, segments);
+ result = kimage_alloc_init(&image, entry, nr_segments,
+ segments, flags);
/* Loading another kernel to switch to if this one crashes */
else if (flags & KEXEC_ON_CRASH) {
/* Free any current crash dump kernel before
* we corrupt it.
*/
kimage_free(xchg(&kexec_crash_image, NULL));
- result = kimage_crash_alloc(&image, entry,
- nr_segments, segments);
+ result = kimage_alloc_init(&image, entry, nr_segments,
+ segments, flags);
crash_map_reserved_pages();
}
if (result)