On 05/07/22 at 07:22pm, Catalin Marinas wrote: > On Sat, May 07, 2022 at 11:30:59AM +0800, Baoquan He wrote: > > On 05/07/22 at 09:41am, Leizhen (ThunderTown) wrote: > > > On 2022/5/7 7:14, Baoquan He wrote: > > > > On 05/06/22 at 07:44pm, Zhen Lei wrote: > > > >> Now arm64 has added support for "crashkernel=X,high" and > > > >> "crashkernel=Y,low". Unlike x86, crash low memory is not allocated if > > > >> "crashkernel=Y,low" is not specified. > > > >> > > > >> Signed-off-by: Zhen Lei <thunder.leiz...@huawei.com> > > > >> --- > > > >> Documentation/admin-guide/kernel-parameters.txt | 9 +++++++-- > > > >> 1 file changed, 7 insertions(+), 2 deletions(-) > > > >> > > > >> diff --git a/Documentation/admin-guide/kernel-parameters.txt > > > >> b/Documentation/admin-guide/kernel-parameters.txt > > > >> index 3f1cc5e317ed4a5..aa44c61114aa4b8 100644 > > > >> --- a/Documentation/admin-guide/kernel-parameters.txt > > > >> +++ b/Documentation/admin-guide/kernel-parameters.txt > > > >> @@ -808,7 +808,7 @@ > > > >> Documentation/admin-guide/kdump/kdump.rst for > > > >> an example. > > > >> > > > >> crashkernel=size[KMG],high > > > >> - [KNL, X86-64] range could be above 4G. Allow > > > >> kernel > > > >> + [KNL, X86-64, ARM64] 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 > > > >> @@ -821,7 +821,7 @@ > > > >> that require some amount of low memory, e.g. > > > >> swiotlb > > > >> requires at least 64M+32K low memory, also > > > >> enough extra > > > >> low memory is needed to make sure DMA buffers > > > >> for 32-bit > > > >> - devices won't run out. Kernel would try to > > > >> allocate at > > > >> + devices won't run out. Kernel would try to > > > >> allocate > > > >> at least 256M below 4G automatically. > > > >> This one let user to specify own low range > > > >> under 4G > > > >> for second kernel instead. > > > >> @@ -829,6 +829,11 @@ > > > >> It will be ignored when crashkernel=X,high is > > > >> not used > > > >> or memory reserved is below 4G. > > > >> > > > >> + [KNL, ARM64] range in low memory. > > > >> + This one let user to specify a low range in DMA > > > >> zone for > > > > ^ not needed, > > > > Maybe Catalin can fix it when merging. > > > > > > Delete "This one let user to" or the entire sentence? I understand it to > > > be the former. > > > > Oh, I mean the 'to' is not needed. "This one let user specify ....". The > > 'to' is a grammer mistake. > > Slightly more correct is "This one lets the user specify..." > > I can fix them up when applying.
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