----- "Ken'ichi Ohmichi" <oomichi(a)mxs.nes.nec.co.jp> wrote:
Hi Dave,
When 'kmem -p'/'kmem -i' is executed on i386 linux-2.6.26 sparsemem
kernel,
current crash utility misunderstands the number of struct page in
each
section and refers invalid struct page.
The cause is that SECTION_SIZE_BITS of PAE has been changed to 29 from
30
since linux-2.6.26 by the following:
[PATCH 3 of 4] sparsemem: reduce i386 PAE section size
http://www.uwsg.iu.edu/hypermail/linux/kernel/0803.3/1882.html
If applying the attached patch, the crash utility can catch up the
above change. It makes the results of both 'kmem -p' and 'kmem -i'
correct. The attached patch is for crash-4.0-7.4.
There is the same problem in makedumpfile, and I will fix it :-)
Thanks
Ken'ichi Ohmichi
Thanks Ken'ichi -- it's queued for the next release.
Dave
Signed-off-by: Ken'ichi Ohmichi <oomichi(a)mxs.nes.nec.co.jp>
---
diff -rpuN crash-4.0-7.4.orig/defs.h crash-4.0-7.4/defs.h
--- crash-4.0-7.4.orig/defs.h 2008-10-16 17:32:46.000000000 +0900
+++ crash-4.0-7.4/defs.h 2008-10-16 17:46:30.000000000 +0900
@@ -2069,7 +2069,8 @@ struct load_module {
#define TIF_SIGPENDING (2)
// CONFIG_X86_PAE
-#define _SECTION_SIZE_BITS_PAE 30
+#define _SECTION_SIZE_BITS_PAE_ORIG 30
+#define _SECTION_SIZE_BITS_PAE_2_6_26 29
#define _MAX_PHYSMEM_BITS_PAE 36
// !CONFIG_X86_PAE
diff -rpuN crash-4.0-7.4.orig/x86.c crash-4.0-7.4/x86.c
--- crash-4.0-7.4.orig/x86.c 2008-10-16 17:32:46.000000000 +0900
+++ crash-4.0-7.4/x86.c 2008-10-16 17:47:58.000000000 +0900
@@ -1819,7 +1819,12 @@ x86_init(int when)
}
if (machdep->flags & PAE) {
- machdep->section_size_bits = _SECTION_SIZE_BITS_PAE;
+ if (THIS_KERNEL_VERSION < LINUX(2,6,26))
+ machdep->section_size_bits =
+ _SECTION_SIZE_BITS_PAE_ORIG;
+ else
+ machdep->section_size_bits =
+ _SECTION_SIZE_BITS_PAE_2_6_26;
machdep->max_physmem_bits = _MAX_PHYSMEM_BITS_PAE;
} else {
machdep->section_size_bits = _SECTION_SIZE_BITS;
_
--
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