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61 lines
2.4 KiB
Diff
61 lines
2.4 KiB
Diff
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From be7d40bc3716ddaaff3cc085f0bdd90b26b72aeb Mon Sep 17 00:00:00 2001
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From: Dan Williams <dan.j.williams@intel.com>
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Date: Wed, 21 Sep 2016 12:50:45 -0700
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Subject: [PATCH] x86/boot: Fix kdump, cleanup aborted E820_PRAM max_pfn
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manipulation
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commit 917db484dc6a69969d317b3e57add4208a8d9d42 upstream.
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In commit:
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ec776ef6bbe1 ("x86/mm: Add support for the non-standard protected e820 type")
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Christoph references the original patch I wrote implementing pmem support.
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The intent of the 'max_pfn' changes in that commit were to enable persistent
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memory ranges to be covered by the struct page memmap by default.
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However, that approach was abandoned when Christoph ported the patches [1], and
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that functionality has since been replaced by devm_memremap_pages().
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In the meantime, this max_pfn manipulation is confusing kdump [2] that
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assumes that everything covered by the max_pfn is "System RAM". This
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results in kdump hanging or crashing.
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[1]: https://lists.01.org/pipermail/linux-nvdimm/2015-March/000348.html
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[2]: https://bugzilla.redhat.com/show_bug.cgi?id=1351098
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So fix it.
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Reported-by: Zhang Yi <yizhan@redhat.com>
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Reported-by: Jeff Moyer <jmoyer@redhat.com>
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Tested-by: Zhang Yi <yizhan@redhat.com>
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Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
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Cc: Andrew Morton <akpm@linux-foundation.org>
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Cc: Boaz Harrosh <boaz@plexistor.com>
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Cc: Christoph Hellwig <hch@lst.de>
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Cc: Linus Torvalds <torvalds@linux-foundation.org>
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Cc: Peter Zijlstra <peterz@infradead.org>
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Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
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Cc: Thomas Gleixner <tglx@linutronix.de>
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Cc: linux-nvdimm@lists.01.org
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Fixes: ec776ef6bbe1 ("x86/mm: Add support for the non-standard protected e820 type")
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Link: http://lkml.kernel.org/r/147448744538.34910.11287693517367139607.stgit@dwillia2-desk3.amr.corp.intel.com
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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arch/x86/kernel/e820.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/arch/x86/kernel/e820.c
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+++ b/arch/x86/kernel/e820.c
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@@ -347,7 +347,7 @@ int __init sanitize_e820_map(struct e820
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* continue building up new bios map based on this
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* information
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*/
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- if (current_type != last_type || current_type == E820_PRAM) {
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+ if (current_type != last_type) {
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if (last_type != 0) {
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new_bios[new_bios_entry].size =
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change_point[chgidx]->addr - last_addr;
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