[Crash-utility] [PATCH] Support linux-2.6.26 sparsemem kernel on i386.

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 Signed-off-by: Ken'ichi Ohmichi <oomichi(a)mxs.nes.nec.co.jp&gt; --- 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; _