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SubjectRe: [PATCH] docs/kernel-parameters: update description of mem=
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Hi Mike,

On 3/9/22 04:24, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@linux.ibm.com>
>
> The existing description of mem= does not cover all the cases and
> differences between how architectures treat it.
>
> Extend the description to match the code.
>
> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
> ---
>
> This is in a way a followup for the discussion of mem= usage on MIPS:
>
> https://lore.kernel.org/all/1646461289-31992-1-git-send-email-yangtiezhu@loongson.cn
>
> .../admin-guide/kernel-parameters.txt | 20 +++++++++++++++++++
> 1 file changed, 20 insertions(+)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index f5a27f067db9..f3597841a031 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -2834,6 +2834,15 @@
> 2 when the kernel is not able to see the whole system memory;
> 3 memory that lies after 'mem=' boundary is excluded from
> the hypervisor, then assigned to KVM guests.
> + 4 to limit the memory available for kdump kernel.
> +
> + [ARC,MICROBLAZE] - the limit applies only to low memory,
> + high memory is not affected.
> +
> + [ARM64] - only limits memory covered by the linear
> + mapping. The NOMAP regions are not affected.
> +
> + [HEXAGON] - must be use to set the memory size, there is

Above line seems to be missing something?

Otherwise looks good AFAIK.

>
> [X86] Work as limiting max address. Use together
> with memmap= to avoid physical address space collisions.
> @@ -2844,6 +2853,17 @@
> in above case 3, memory may need be hot added after boot
> if system memory of hypervisor is not sufficient.
>
> + mem=nn[KMG]@ss[KMG]
> + [ARM,MIPS] - override the memory layout reported by
> + firmware.
> + Define a memory region of size nn[KMG] starting at
> + ss[KMG].
> + Multiple different regions can be specified with
> + multiple mem= parameters on the command line.
> +
> + mem=nn[KMG] [HEXAGON] Set the memory size.
> + Must be specified, otherwise memory size will be 0.
> +
> mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
> memory.
>

--
~Randy

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