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authorBernhard Walle <bwalle@suse.de>2007-10-18 23:40:58 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-19 11:53:49 -0700
commitcba63c3089fe57bfafff56239a67ac26bfe027a0 (patch)
treea247f3b0352e29e9da5cc07e840b28b5e27ba2e4 /include
parent283bb7fada7e33a759d8fc9bd7a44532e4ad420e (diff)
Extended crashkernel command line
This patch adds a extended crashkernel syntax that makes the value of reserved system RAM dependent on the system RAM itself: crashkernel=<range1>:<size1>[,<range2>:<size2>,...][@offset] range=start-[end] For example: crashkernel=512M-2G:64M,2G-:128M The motivation comes from distributors that configure their crashkernel command line automatically with some configuration tool (YaST, you know ;)). Of course that tool knows the value of System RAM, but if the user removes RAM, then the system becomes unbootable or at least unusable and error handling is very difficult. This series implements this change for i386, x86_64, ia64, ppc64 and sh. That should be all platforms that support kdump in current mainline. I tested all platforms except sh due to the lack of a sh processor. This patch: This is the generic part of the patch. It adds a parse_crashkernel() function in kernel/kexec.c that is called by the architecture specific code that actually reserves the memory. That function takes the whole command line and looks itself for "crashkernel=" in it. If there are multiple occurrences, then the last one is taken. The advantage is that if you have a bootloader like lilo or elilo which allows you to append a command line parameter but not to remove one (like in GRUB), then you can add another crashkernel value for testing at the boot command line and this one overwrites the command line in the configuration then. Signed-off-by: Bernhard Walle <bwalle@suse.de> Cc: Andi Kleen <ak@suse.de> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Vivek Goyal <vgoyal@in.ibm.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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/kexec.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index ad4b82ce84a..2d9c448d8c5 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -187,6 +187,8 @@ extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
extern size_t vmcoreinfo_size;
extern size_t vmcoreinfo_max_size;
+int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
+ unsigned long long *crash_size, unsigned long long *crash_base);
#else /* !CONFIG_KEXEC */
struct pt_regs;