Add extended crashkernel command line syntax

Bernhard Walle kexec linux-arch linux-ia64 linuxppc-dev lkml 1 version Sep 25, 2007 In review

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v1 Latest Sep 25, 20077 patches 9 repliesIn review

Patches in v1 No applies recorded yet

#	Subject and files	Size	Replies
1/7	Extended crashkernel command line`include/linux/kexec.h` `kernel/kexec.c`	+144 -0	7 replies
2/7	Use extended crashkernel command line on i386`arch/i386/kernel/e820.c` `arch/i386/kernel/machine_kexec.c` `arch/i386/kernel/setup.c`	+46 ~~-28~~	0 replies
3/7	Use extended crashkernel command line on x86_64`arch/x86_64/kernel/e820.c` `arch/x86_64/kernel/machine_kexec.c` `arch/x86_64/kernel/setup.c`	+34 ~~-35~~	0 replies
4/7	Use extended crashkernel command line on ia64`arch/ia64/kernel/efi.c` `arch/ia64/kernel/setup.c` `include/asm-ia64/meminit.h`	+50 ~~-44~~	0 replies
5/7	Use extended crashkernel command line on ppc64`arch/powerpc/kernel/machine_kexec.c`	+26 ~~-26~~	2 replies
6/7	Use extended crashkernel command line on sh`arch/sh/kernel/machine_kexec.c` `arch/sh/kernel/setup.c`	+33 ~~-26~~	0 replies
7/7	Add documentation for extended crashkernel syntax`Documentation/kdump/kdump.txt` `Documentation/kernel-parameters.txt`	+33 -0	0 replies

Reviews trailers per patch

2 of 7 patches have a Reviewed-by or Acked-by.

Patch	Paul Mundt	Oleg Verych
1/7		R-b
2/7
3/7
4/7
5/7
6/7	A-b
7/7

Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.

Read the v1 thread

Cover letter [patch 0/7] Add extended crashkernel command line syntax

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.

The patch series is against 2.6.23-rc8-mm1 and replaces following patches:

- extended-crashkernel-command-line.patch
- use-extended-crashkernel-command-line-on-i386.patch
- use-extended-crashkernel-command-line-on-i386-fix-config_nohighmem-for-extended-crashkernel-command-line.patch
- use-extended-crashkernel-command-line-on-i386-fix-config_nohighmem-for-extended-crashkernel-command-line-fix.patch
- use-extended-crashkernel-command-line-on-x86_64.patch
- use-extended-crashkernel-command-line-on-ia64.patch
- use-extended-crashkernel-command-line-on-ia64-fix.patch
- use-extended-crashkernel-command-line-on-ppc64.patch
- use-extended-crashkernel-command-line-on-sh.patch
- add-documentation-for-extended-crashkernel-syntax.patch
- add-documentation-for-extended-crashkernel-syntax-add-extended-crashkernel-syntax-to-kernel-parameterstxt.patch

Modifications compared to last submit:

- typecast to (unsigned long long) before shifting
- small coding style adjustments
- BUG_ON() in parse_crashkernel()
- merge patch that adds documentation do Documentation/kernel-parameters.txt in documentation patch (this has been an extra patch previously)
- fix build on IA64
- fix build on i386 with CONFIG_NOHIGHMEM

Signed-off-by Bernhard Walle <[email protected]>

Read the cover letter in its thread