path: root/Documentation
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authorYinghai Lu <yinghai@kernel.org>2013-04-15 22:23:48 -0700
committerH. Peter Anvin <hpa@linux.intel.com>2013-04-17 12:35:33 -0700
commitadbc742bf78695bb98c79d18c558b61571748b99 (patch)
treedc23f5049248f7aa9ddf5ee62434dba81d707531 /Documentation
parent55a20ee7804ab64ac90bcdd4e2868a42829e2784 (diff)
x86, kdump: Change crashkernel_high/low= to crashkernel=,high/low
Per hpa, use crashkernel=X,high crashkernel=Y,low instead of crashkernel_hign=X crashkernel_low=Y. As that could be extensible. -v2: according to Vivek, change delimiter to ; -v3: let hign and low only handle simple form and it conforms to description in kernel-parameters.txt still keep crashkernel=X override any crashkernel=X,high crashkernel=Y,low -v4: update get_last_crashkernel returning and add more strict checking in parse_crashkernel_simple() found by HATAYAMA. -v5: Change delimiter back to , according to HPA. also separate parse_suffix from parse_simper according to vivek. so we can avoid @pos in that path. -v6: Tight the checking about crashkernel=X,highblahblah,high found by HTYAYAMA. Cc: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com> Signed-off-by: Yinghai Lu <yinghai@kernel.org> Link: http://lkml.kernel.org/r/1366089828-19692-5-git-send-email-yinghai@kernel.org Acked-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'Documentation')
1 files changed, 5 insertions, 5 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 709eb3edc6b..a1ac1f1d6d3 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -603,16 +603,16 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
a memory unit (amount[KMG]). See also
Documentation/kdump/kdump.txt for an example.
- crashkernel_high=size[KMG]
+ crashkernel=size[KMG],high
[KNL, x86_64] range could be above 4G. Allow kernel
to allocate physical memory region from top, so could
be above 4G if system have more than 4G ram installed.
Otherwise memory region will be allocated below 4G, if
It will be ignored if crashkernel=X is specified.
- crashkernel_low=size[KMG]
- [KNL, x86_64] range under 4G. When crashkernel_high= is
- passed, kernel could allocate physical memory region
+ crashkernel=size[KMG],low
+ [KNL, x86_64] range under 4G. When crashkernel=X,high
+ is passed, kernel could allocate physical memory region
above 4G, that cause second kernel crash on system
that require some amount of low memory, e.g. swiotlb
requires at least 64M+32K low memory. Kernel would
@@ -620,7 +620,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
This one let user to specify own low range under 4G
for second kernel instead.
0: to disable low allocation.
- It will be ignored when crashkernel_high=X is not used
+ It will be ignored when crashkernel=X,high is not used
or memory reserved is below 4G.
cs89x0_dma= [HW,NET]