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From e113f1c974c820f9633dc0073eda525d7575f365 Mon Sep 17 00:00:00 2001
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From: Pingfan Liu <piliu@redhat.com>
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Date: Mon, 20 Jan 2020 10:25:24 +0800
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Subject: [PATCH 3/7] [PATCH] cope with not-present mem section
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After kernel commit ba72b4c8cf60 ("mm/sparsemem: support sub-section
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hotplug"), when hot-removed, section_mem_map is still encoded with section
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start pfn, not NULL. This break the current makedumpfile.
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# makedumpfile -x vmlinux -l -d 31 vmcore vmcore.dump
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get_mem_section: Could not validate mem_section.
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get_mm_sparsemem: Can't get the address of mem_section.
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makedumpfile Failed.
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Whatever section_mem_map coding info after hot-removed, it is reliable
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just to work on SECTION_MARKED_PRESENT bit. Fixing makedumpfile by this
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way.
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[ This issue occurs on kernel 5.3 through 5.5, and should be fixed by
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commit 1f503443e7df ("mm/sparse.c: reset section's mem_map when fully
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deactivated") in 5.6-rc1, 5.5.3 and 5.4.19. ]
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Signed-off-by: Pingfan Liu <piliu@redhat.com>
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To: kexec@lists.infradead.org
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Cc: Kazuhito Hagio <k-hagio@ab.jp.nec.com>
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Cc: Baoquan He <bhe@redhat.com>
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Cc: David Hildenbrand <david@redhat.com>
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Cc: Andrew Morton <akpm@linux-foundation.org>
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Cc: Dan Williams <dan.j.williams@intel.com>
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Cc: Oscar Salvador <osalvador@suse.de>
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Cc: Michal Hocko <mhocko@kernel.org>
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Cc: Qian Cai <cai@lca.pw>
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---
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makedumpfile.c | 6 +-----
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1 file changed, 1 insertion(+), 5 deletions(-)
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diff --git a/makedumpfile-1.6.7/makedumpfile.c b/makedumpfile-1.6.7/makedumpfile.c
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index ae7336a..607e07f 100644
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--- a/makedumpfile-1.6.7/makedumpfile.c
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+++ b/makedumpfile-1.6.7/makedumpfile.c
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@@ -3406,8 +3406,6 @@ section_mem_map_addr(unsigned long addr, unsigned long *map_mask)
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map = ULONG(mem_section + OFFSET(mem_section.section_mem_map));
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mask = SECTION_MAP_MASK;
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*map_mask = map & ~mask;
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- if (map == 0x0)
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- *map_mask |= SECTION_MARKED_PRESENT;
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map &= mask;
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free(mem_section);
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@@ -3453,10 +3451,8 @@ validate_mem_section(unsigned long *mem_sec,
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mem_map = NOT_MEMMAP_ADDR;
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} else {
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mem_map = section_mem_map_addr(section, &map_mask);
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+ /* for either no mem_map or hot-removed */
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if (!(map_mask & SECTION_MARKED_PRESENT)) {
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- return FALSE;
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- }
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- if (mem_map == 0) {
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mem_map = NOT_MEMMAP_ADDR;
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} else {
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mem_map = sparse_decode_mem_map(mem_map,
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--
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2.7.5
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