Hi Kazu and Cascardo,
I encounter a weird problem when running makedumpfile on a s390 machine.
Our production kernel uses extreme sparse memory model, and has the
following:
in mm/sparse.c
#ifdef CONFIG_SPARSEMEM_EXTREME
struct mem_section **mem_section;
#else
struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT]
____cacheline_internodealigned_in_smp;
#endif
So in makedumpfile.c, get_mem_section(), it got a failed result when the
first call site to validate_mem_section(), then it should success at the
second call site to validate_mem_section(), which is inside if
(is_sparsemem_extreme()) condition.
But the actual result is not like expected.
After introducing
commit e113f1c974c820f9633dc0073eda525d7575f365 [PATCH] cope with
not-present mem section
I got two successful calls to validate_mem_section(), and finally failed
at the condition
ret = symbol_valid ^ pointer_valid;
if (!ret) {
ERRMSG("Could not validate mem_section.\n");
}
Do you have any idea?
Thanks,
Pingfan
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