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From a02f5f078ce635dd1633dab70869306b0a62e2e2 Mon Sep 17 00:00:00 2001
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From: Pratyush Anand <panand@redhat.com>
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Date: Thu, 17 Aug 2017 12:47:13 +0900
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Subject: [PATCH v2] Fix SECTION_MAP_MASK for kernel >= v.13
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* Required for kernel 4.13
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commit 2d070eab2e82 "mm: consider zone which is not fully populated to
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have holes" added a new flag SECTION_IS_ONLINE and therefore
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SECTION_MAP_MASK has been changed. We are not able to find correct
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mem_map in makedumpfile for kernel version v4.13-rc1 and onward because
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of the above kernel change.
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This patch fixes the MASK value keeping the code backward compatible
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Signed-off-by: Pratyush Anand <panand@redhat.com>
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---
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makedumpfile.c | 5 ++++-
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makedumpfile.h | 4 +++-
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2 files changed, 7 insertions(+), 2 deletions(-)
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diff --git a/makedumpfile-1.6.2/makedumpfile.c b/makedumpfile-1.6.2/makedumpfile.c
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index 8af0c9d..5096319 100644
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--- a/makedumpfile-1.6.2/makedumpfile.c
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+++ b/makedumpfile-1.6.2/makedumpfile.c
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@@ -3304,7 +3304,10 @@ section_mem_map_addr(unsigned long addr)
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return NOT_KV_ADDR;
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}
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map = ULONG(mem_section + OFFSET(mem_section.section_mem_map));
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- map &= SECTION_MAP_MASK;
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+ if (info->kernel_version < KERNEL_VERSION(4, 13, 0))
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+ map &= SECTION_MAP_MASK_4_12;
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+ else
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+ map &= SECTION_MAP_MASK;
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free(mem_section);
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return map;
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diff --git a/makedumpfile-1.6.2/makedumpfile.h b/makedumpfile-1.6.2/makedumpfile.h
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index b0cdd02..6f188e4 100644
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--- a/makedumpfile-1.6.2/makedumpfile.h
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+++ b/makedumpfile-1.6.2/makedumpfile.h
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@@ -183,7 +183,9 @@ isAnon(unsigned long mapping)
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#define SECTIONS_PER_ROOT() (info->sections_per_root)
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#define SECTION_ROOT_MASK() (SECTIONS_PER_ROOT() - 1)
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#define SECTION_NR_TO_ROOT(sec) ((sec) / SECTIONS_PER_ROOT())
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-#define SECTION_MAP_LAST_BIT (1UL<<2)
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+#define SECTION_IS_ONLINE (1UL<<2)
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+#define SECTION_MAP_LAST_BIT (1UL<<3)
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+#define SECTION_MAP_MASK_4_12 (~(SECTION_IS_ONLINE-1))
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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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2.7.4
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