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[PATCH] kdump: dynamic per cpu allocation of memory for saving cpu registers

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- In case of system crash, current state of cpu registers is saved in memory
  in elf note format.  So far memory for storing elf notes was being allocated
  statically for NR_CPUS.

- This patch introduces dynamic allocation of memory for storing elf notes.
  It uses alloc_percpu() interface.  This should lead to better memory usage.

- Introduced based on Andi Kleen's and Eric W. Biederman's suggestions.

- This patch also moves memory allocation for elf notes from architecture
  dependent portion to architecture independent portion.  Now crash_notes is
  architecture independent.  The whole idea is that size of memory to be
  allocated per cpu (MAX_NOTE_BYTES) can be architecture dependent and
  allocation of this memory can be architecture independent.

Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Vivek Goyal
2006-01-09 20:51:41 -08:00
committed by Linus Torvalds
parent 8240941157
commit cc57165874
10 changed files with 21 additions and 24 deletions
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6
arch/ppc/kernel/machine_kexec.c
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@@ -28,12 +28,6 @@ typedef NORET_TYPE void (*relocate_new_kernel_t)(
const extern unsigned char relocate_new_kernel[];
const extern unsigned int relocate_new_kernel_size;
/*
* Provide a dummy crash_notes definition while crash dump arrives to ppc.
* This prevents breakage of crash_notes attribute in kernel/ksysfs.c.
*/
note_buf_t crash_notes[NR_CPUS];
void machine_shutdown(void)
{
if (ppc_md.machine_shutdown)