Re: [PATCH][2/4] kexec: Enable co-existence of normal kexec Image and kexec on panic Image

[Hariprasad Nellitheertha <hari@in.ibm.com>]

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This patch, to kexec, makes it possible to separate out the 
two uses of kexec - for normal kexec usage and 
kexec-on-panic. The image for the panic case is loaded using 
the "kexec -p" option instead of "kexec -l".

Regards, Hari

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Signed-off-by: Hariprasad Nellitheertha <hari@in.ibm.com>
---

 linux-kexec-hari/include/linux/kexec.h |    1 +
 linux-kexec-hari/kernel/kexec.c        |   13 +++++--------
 2 files changed, 6 insertions(+), 8 deletions(-)

diff -puN include/linux/kexec.h~kexec-panic include/linux/kexec.h
--- linux-kexec/include/linux/kexec.h~kexec-panic	2004-10-18 14:59:01.000000000 +0530
+++ linux-kexec-hari/include/linux/kexec.h	2004-10-18 15:00:33.000000000 +0530
@@ -52,5 +52,6 @@ extern asmlinkage long sys_kexec(unsigne
 	struct kexec_segment *segments);
 extern struct page *kimage_alloc_control_pages(struct kimage *image, unsigned int order);
 extern struct kimage *kexec_image;
+extern struct kimage *kexec_crash_image;
 #endif
 #endif /* LINUX_KEXEC_H */
diff -puN kernel/kexec.c~kexec-panic kernel/kexec.c
--- linux-kexec/kernel/kexec.c~kexec-panic	2004-10-18 14:59:01.000000000 +0530
+++ linux-kexec-hari/kernel/kexec.c	2004-10-19 14:12:33.000000000 +0530
@@ -585,6 +585,7 @@ static int kimage_load_segment(struct ki
  * that to happen you need to do that yourself.
  */
 struct kimage *kexec_image = NULL;
+struct kimage *kexec_crash_image = NULL;
 
 asmlinkage long sys_kexec_load(unsigned long entry, unsigned long nr_segments,
 	struct kexec_segment *segments, unsigned long flags)
@@ -596,13 +597,6 @@ asmlinkage long sys_kexec_load(unsigned 
 	if (!capable(CAP_SYS_BOOT))
 		return -EPERM;
 
-	/*
-	 * In case we need just a little bit of special behavior for
-	 * reboot on panic.
-	 */
-	if (flags != 0)
-		return -EINVAL;
-
 	if (nr_segments > KEXEC_SEGMENT_MAX)
 		return -EINVAL;
 
@@ -632,7 +626,10 @@ asmlinkage long sys_kexec_load(unsigned 
 		}
 	}
 
-	image = xchg(&kexec_image, image);
+	if (!flags)
+		image = xchg(&kexec_image, image);
+	else
+		image = xchg(&kexec_crash_image, image);
 
  out:
 	kimage_free(image);
_