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Message-Id: <1403814824-7587-6-git-send-email-vgoyal@redhat.com>
Date: Thu, 26 Jun 2014 16:33:34 -0400
From: Vivek Goyal <vgoyal@...hat.com>
To: linux-kernel@...r.kernel.org, kexec@...ts.infradead.org
Cc: ebiederm@...ssion.com, hpa@...or.com, mjg59@...f.ucam.org,
greg@...ah.com, bp@...en8.de, dyoung@...hat.com,
chaowang@...hat.com, bhe@...hat.com, akpm@...ux-foundation.org,
Vivek Goyal <vgoyal@...hat.com>
Subject: [PATCH 05/15] 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@...hat.com>
---
kernel/kexec.c | 105 +++++++++++++++++++--------------------------------------
1 file changed, 34 insertions(+), 71 deletions(-)
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 44e823e..c69ce00 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -260,12 +260,20 @@ 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();
@@ -274,20 +282,26 @@ 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) {
@@ -295,10 +309,12 @@ 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;
@@ -307,60 +323,7 @@ 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,
@@ -1003,16 +966,16 @@ 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)
--
1.9.0
--
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