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From 7bdb468c2c99dd780c9a5321f93c79cbfdce2527 Mon Sep 17 00:00:00 2001
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From: Kazuhito Hagio <k-hagio@ab.jp.nec.com>
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Date: Tue, 23 Jul 2019 12:24:47 -0400
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Subject: [PATCH] [PATCH] Increase SECTION_MAP_LAST_BIT to 4
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kernel commit 326e1b8f83a4 ("mm/sparsemem: introduce a SECTION_IS_EARLY
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flag") added the flag to mem_section->section_mem_map value, and it caused
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makedumpfile an error like the following:
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readmem: Can't convert a virtual address(fffffc97d1000000) to physical address.
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readmem: type_addr: 0, addr:fffffc97d1000000, size:32768
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__exclude_unnecessary_pages: Can't read the buffer of struct page.
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create_2nd_bitmap: Can't exclude unnecessary pages.
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To fix this, SECTION_MAP_LAST_BIT needs to be updated. The bit has not
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been used until the addition, so we can just increase the value.
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Signed-off-by: Kazuhito Hagio <k-hagio@ab.jp.nec.com>
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---
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makedumpfile.h | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/makedumpfile-1.6.6/makedumpfile.h b/makedumpfile-1.6.6/makedumpfile.h
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index 24b2f69f400c..df745b9f53e5 100644
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--- a/makedumpfile-1.6.6/makedumpfile.h
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+++ b/makedumpfile-1.6.6/makedumpfile.h
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@@ -195,7 +195,7 @@ isAnon(unsigned long mapping)
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* 2. it has been verified that (1UL<<2) was never set, so it is
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* safe to mask that bit off even in old kernels.
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*/
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-#define SECTION_MAP_LAST_BIT (1UL<<3)
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+#define SECTION_MAP_LAST_BIT (1UL<<4)
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#define SECTION_MAP_MASK (~(SECTION_MAP_LAST_BIT-1))
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#define NR_SECTION_ROOTS() divideup(num_section, SECTIONS_PER_ROOT())
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#define SECTION_NR_TO_PFN(sec) ((sec) << PFN_SECTION_SHIFT())
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--
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2.17.2
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