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authorKen'ichi Ohmichi <oomichi@mxs.nes.nec.co.jp>2008-04-02 16:04:50 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-02 18:28:19 -0400
commit629c8b4cdb354518308663aff2f719e02f69ffbe (patch)
tree0754db238b377089f77b57ba4a8071054119fb33 /arch/x86/kernel/machine_kexec_64.c
parent865965a66ea616a413012edcd3a10ef39c06d672 (diff)
vmcoreinfo: add the symbol "phys_base"
Fix the problem that makedumpfile sometimes fails on x86_64 machine. This patch adds the symbol "phys_base" to a vmcoreinfo data. The vmcoreinfo data has the minimum debugging information only for dump filtering. makedumpfile (dump filtering command) gets it to distinguish unnecessary pages, and makedumpfile creates a small dumpfile. On x86_64 kernel which compiled with CONFIG_PHYSICAL_START=0x0 and CONFIG_RELOCATABLE=y, makedumpfile fails like the following: # makedumpfile -d31 /proc/vmcore dumpfile The kernel version is not supported. The created dumpfile may be incomplete. _exclude_free_page: Can't get next online node. makedumpfile Failed. # The cause is the lack of the symbol "phys_base" in a vmcoreinfo data. If the symbol "phys_base" does not exist, makedumpfile considers an x86_64 kernel as non relocatable. As the result, makedumpfile misunderstands the physical address where the kernel is loaded, and it cannot translate a kernel virtual address to physical address correctly. To fix this problem, this patch adds the symbol "phys_base" to a vmcoreinfo data. Signed-off-by: Ken'ichi Ohmichi <oomichi@mxs.nes.nec.co.jp> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: <stable@kernel.org> Acked-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86/kernel/machine_kexec_64.c')
-rw-r--r--arch/x86/kernel/machine_kexec_64.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
index 236d2f8f7dd..576a03db451 100644
--- a/arch/x86/kernel/machine_kexec_64.c
+++ b/arch/x86/kernel/machine_kexec_64.c
@@ -233,6 +233,7 @@ NORET_TYPE void machine_kexec(struct kimage *image)
233 233
234void arch_crash_save_vmcoreinfo(void) 234void arch_crash_save_vmcoreinfo(void)
235{ 235{
236 VMCOREINFO_SYMBOL(phys_base);
236 VMCOREINFO_SYMBOL(init_level4_pgt); 237 VMCOREINFO_SYMBOL(init_level4_pgt);
237 238
238#ifdef CONFIG_NUMA 239#ifdef CONFIG_NUMA