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Merge branch 'x86-kdump-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull x86 kdump update from Ingo Molnar:
 "This includes two changes:

   - Raise the crash kernel reservation limit from from ~896MB to ~4GB.

     Only very old (and already known-broken) kexec-tools is supposed to
     be affected by this negatively.

   - Allow higher than 4GB crash kernel allocations when low allocations
     fail"

* 'x86-kdump-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/kdump: Fall back to reserve high crashkernel memory
  x86/kdump: Have crashkernel=X reserve under 4G by default
This commit is contained in:
Linus Torvalds
2019-05-06 16:11:45 -07:00
parent 8f14772703 b9ac3849af
commit e913c4a4c2
2 changed files with 24 additions and 15 deletions
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7
Documentation/admin-guide/kernel-parameters.txt
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@@ -704,8 +704,11 @@
upon panic. This parameter reserves the physical
memory region [offset, offset + size] for that kernel
image. If '@offset' is omitted, then a suitable offset
is selected automatically. Check
Documentation/kdump/kdump.txt for further details.
is selected automatically.
[KNL, x86_64] select a region under 4G first, and
fall back to reserve region above 4G when '@offset'
hasn't been specified.
See Documentation/kdump/kdump.txt for further details.
crashkernel=range1:size1[,range2:size2,...][@offset]
[KNL] Same as above, but depends on the memory