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authorKen'ichi Ohmichi <oomichi@mxs.nes.nec.co.jp>2007-10-26 14:19:26 +0900
committerThomas Gleixner <tglx@linutronix.de>2007-10-27 20:57:43 +0200
commit69243f91257083795065762ce805120b980e256b (patch)
tree40babe7d59d7b6d95cd250b29d62cf8572b1758d
parent03d0d20e640a6189ec85fa917259d94013b4d730 (diff)
x86: Dump filtering supports x86_64 sparsemem
This patch adds the symbol "init_level4_pgt" to the vmcoreinfo data so that makedumpfile (dump filtering command) supports x86_64 sparsemem kernel of linux-2.6.24. makedumpfile creates a small dumpfile by excluding unnecessary pages for the analysis. It checks attributes in page structures and distinguishes necessary pages and unnecessary ones. To check them, makedumpfile gets the vmcoreinfo data which has the minimum debugging information only for dump filtering. For older x86_64 kernel (linux-2.6.23 or before), makedumpfile translates the virtual address of page structure into physical address by subtracting PAGE_OFFSET from virtual address, but this translation isn't effective for linux-2.6.24 sparsemem kernel, because its page structures are in virtual memmap area. makedumpfile should translate their virtual address by 4-levels paging and it needs the symbol "init_level4_pgt". Signed-off-by: Ken'ichi Ohmichi <oomichi@mxs.nes.nec.co.jp> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--arch/x86/kernel/machine_kexec_64.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
index 0d8577f05422..aa3d2c8f7737 100644
--- a/arch/x86/kernel/machine_kexec_64.c
+++ b/arch/x86/kernel/machine_kexec_64.c
@@ -233,6 +233,8 @@ NORET_TYPE void machine_kexec(struct kimage *image)
void arch_crash_save_vmcoreinfo(void)
{
+ VMCOREINFO_SYMBOL(init_level4_pgt);
+
#ifdef CONFIG_ARCH_DISCONTIGMEM_ENABLE
VMCOREINFO_SYMBOL(node_data);
VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);