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From f63d8530b9b6a2d7e79b946e326e5a2197eb8f87 Mon Sep 17 00:00:00 2001
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From: Petr Tesarik <ptesarik@suse.com>
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Date: Thu, 19 Jan 2017 18:37:09 +0100
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Subject: [PATCH] ppc64: Reduce number of ELF LOAD segments
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The number of program header table entries (e_phnum) is an Elf64_Half,
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which is a 16-bit entity, i.e. the limit is 65534 entries (one entry is
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reserved for NOTE). This is a hard limit, defined by the ELF standard.
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It is possible that more LMBs (Logical Memory Blocks) are needed to
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represent all RAM on some machines, and this field overflows, causing
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an incomplete /proc/vmcore file.
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This has actually happened on a machine with 31TB of RAM and an LMB size
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of 256MB.
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However, since there is usually no memory hole between adjacent LMBs, the
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map can be "compressed", combining multiple adjacent into a single LOAD
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segment.
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Signed-off-by: Petr Tesarik <ptesarik@suse.com>
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Signed-off-by: Simon Horman <horms@verge.net.au>
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Signed-off-by: Pingfan Liu <piliu@redhat.com>
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---
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kexec/arch/ppc64/crashdump-ppc64.c | 12 +++++++++++-
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1 file changed, 11 insertions(+), 1 deletion(-)
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diff --git a/kexec/arch/ppc64/crashdump-ppc64.c b/kexec/arch/ppc64/crashdump-ppc64.c
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index b3c8928..f62b159 100644
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--- a/kexec/arch/ppc64/crashdump-ppc64.c
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+++ b/kexec/arch/ppc64/crashdump-ppc64.c
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@@ -123,6 +123,7 @@ static void exclude_crash_region(uint64_t start, uint64_t end)
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static int get_dyn_reconf_crash_memory_ranges(void)
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{
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uint64_t start, end;
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+ uint64_t startrange, endrange;
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char fname[128], buf[32];
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FILE *file;
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unsigned int i;
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@@ -137,6 +138,7 @@ static int get_dyn_reconf_crash_memory_ranges(void)
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}
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fseek(file, 4, SEEK_SET);
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+ startrange = endrange = 0;
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for (i = 0; i < num_of_lmbs; i++) {
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if ((n = fread(buf, 1, 24, file)) < 0) {
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perror(fname);
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@@ -162,8 +164,16 @@ static int get_dyn_reconf_crash_memory_ranges(void)
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if ((flags & 0x80) || !(flags & 0x8))
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continue;
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- exclude_crash_region(start, end);
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+ if (start != endrange) {
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+ if (startrange != endrange)
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+ exclude_crash_region(startrange, endrange);
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+ startrange = start;
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+ }
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+ endrange = end;
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}
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+ if (startrange != endrange)
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+ exclude_crash_region(startrange, endrange);
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+
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fclose(file);
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return 0;
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}
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--
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2.7.4
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