Hi, Thanks for the update, but still some nitpicks :( I'm sorry I did not catch them previously, but maybe it is not worth to repost the whole series if no other changes needed. On 07/03/20 at 11:58am, Chen Zhou wrote: > Now we support crashkernel=X,[low] on arm64, update the Documentation. > We could use parameters "crashkernel=X crashkernel=Y,low" to reserve > memory above 4G. > > Signed-off-by: Chen Zhou <chenzhou10@xxxxxxxxxx> > Tested-by: John Donnelly <John.p.donnelly@xxxxxxxxxx> > Tested-by: Prabhakar Kushwaha <pkushwaha@xxxxxxxxxxx> > --- > Documentation/admin-guide/kdump/kdump.rst | 14 ++++++++++++-- > Documentation/admin-guide/kernel-parameters.txt | 17 +++++++++++++++-- > 2 files changed, 27 insertions(+), 4 deletions(-) > > diff --git a/Documentation/admin-guide/kdump/kdump.rst b/Documentation/admin-guide/kdump/kdump.rst > index 2da65fef2a1c..e80fc9e28a9a 100644 > --- a/Documentation/admin-guide/kdump/kdump.rst > +++ b/Documentation/admin-guide/kdump/kdump.rst > @@ -299,7 +299,15 @@ Boot into System Kernel > "crashkernel=64M@16M" tells the system kernel to reserve 64 MB of memory > starting at physical address 0x01000000 (16MB) for the dump-capture kernel. > > - On x86 and x86_64, use "crashkernel=64M@16M". > + On x86 use "crashkernel=64M@16M". > + > + On x86_64, use "crashkernel=Y" to select a region under 4G first, and > + fall back to reserve region above 4G. > + We can also use "crashkernel=X,high" to select a region above 4G, which > + also tries to allocate at least 256M below 4G automatically and > + "crashkernel=Y,low" can be used to allocate specified size low memory. > + Use "crashkernel=Y@X" if we really have to reserve memory from specified s/we/you > + start address X. > > On ppc64, use "crashkernel=128M@32M". > > @@ -316,8 +324,10 @@ Boot into System Kernel > kernel will automatically locate the crash kernel image within the > first 512MB of RAM if X is not given. > > - On arm64, use "crashkernel=Y[@X]". Note that the start address of > + On arm64, use "crashkernel=Y[@X]". Note that the start address of > the kernel, X if explicitly specified, must be aligned to 2MiB (0x200000). > + If crashkernel=Z,low is specified simultaneously, reserve spcified size s/spcified/specified > + low memory firstly and then reserve memory above 4G. > > Load the Dump-capture Kernel > ============================ > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt > index fb95fad81c79..58a731eed011 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -722,6 +722,9 @@ > [KNL, x86_64] select a region under 4G first, and > fall back to reserve region above 4G when '@offset' > hasn't been specified. > + [KNL, arm64] If crashkernel=X,low is specified, reserve > + spcified size low memory firstly, and then reserve memory s/spcified/specified > + above 4G. > See Documentation/admin-guide/kdump/kdump.rst for further details. > > crashkernel=range1:size1[,range2:size2,...][@offset] > @@ -746,13 +749,23 @@ > 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 > - at least 256M below 4G automatically. > + least 256M below 4G automatically. > 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=X,high is not used > or memory reserved is below 4G. > - > + [KNL, arm64] range under 4G. > + This one let user to specify own low range under 4G s/own low/a low > + for crash dump kernel instead. > + Be different from x86_64, kernel reserves specified size > + physical memory region only when this parameter is specified > + instead of trying to reserve at least 256M below 4G > + automatically. > + Use this parameter along with crashkernel=X when we want > + to reserve crashkernel above 4G. If there are devices > + need to use ZONE_DMA in crash dump kernel, it is also > + a good choice. > cryptomgr.notests > [KNL] Disable crypto self-tests > > -- > 2.20.1 >
