The patch titled
vmcoreinfo: add the symbol "phys_base"
has been removed from the -mm tree. Its filename was
vmcoreinfo-add-the-symbol-phys_base.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: vmcoreinfo: add the symbol "phys_base"
From: "Ken'ichi Ohmichi" <oomichi@xxxxxxxxxxxxxxxxx>
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 proble, the attached patch
which adds the symbol "phys_base" to a vmcoreinfo data.
Signed-off-by: Ken'ichi Ohmichi <oomichi@xxxxxxxxxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxx>
Acked-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/machine_kexec_64.c | 1 +
1 file changed, 1 insertion(+)
diff -puN arch/x86/kernel/machine_kexec_64.c~vmcoreinfo-add-the-symbol-phys_base arch/x86/kernel/machine_kexec_64.c
--- a/arch/x86/kernel/machine_kexec_64.c~vmcoreinfo-add-the-symbol-phys_base
+++ a/arch/x86/kernel/machine_kexec_64.c
@@ -233,6 +233,7 @@ NORET_TYPE void machine_kexec(struct kim
void arch_crash_save_vmcoreinfo(void)
{
+ VMCOREINFO_SYMBOL(phys_base);
VMCOREINFO_SYMBOL(init_level4_pgt);
#ifdef CONFIG_NUMA
_
Patches currently in -mm which might be from oomichi@xxxxxxxxxxxxxxxxx are
origin.patch
vmcoreinfo-add-page-flags-values.patch
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