Re: [PATCH v4 0/4] MIPS: Modify mem= and memmap= parameter

[Mike Rapoport <rppt@kernel.org>]

Hi,

On Tue, Mar 01, 2022 at 12:28:57PM +0800, Tiezhu Yang wrote:
> In the current code, the kernel command-line parameter mem= and memmap=
> can not work well on MIPS, this patchset refactors the related code to
> fix them.
> 
> For kdump on MIPS, if the users want to limit the memory region for the
> capture kernel to avoid corrupting the memory image of the panic kernel,
> use the parameter memmap=limit@base is the proper way, I will submit a
> patch to use memmap=limit@base for kexec-tools after this patchset is
> applied.

Sorry, apparently I misread the prevoius version.
What's wrong with the current implementation of mem=limit@base for the
kdump case?
 
> v4: Fix some build warnings reported by kernel test robot
> 
> v3: Modify patch #3 to maintain compatibility for memmap=limit{$,#,!}base,
>     commented by Mike Rapoport, thank you
> 
> v2: Add some new patches to support memmap=limit@base
> 
> Tiezhu Yang (4):
>   MIPS: Refactor early_parse_mem() to fix mem= parameter
>   memblock: Introduce memblock_mem_range_remove_map()
>   MIPS: Refactor early_parse_memmap() to fix memmap= parameter
>   MIPS: Remove not used variable usermem
> 
>  arch/mips/kernel/setup.c | 69 ++++++++++++++++++++++--------------------------
>  include/linux/memblock.h |  1 +
>  mm/memblock.c            |  9 +++++--
>  3 files changed, 40 insertions(+), 39 deletions(-)
> 
> -- 
> 2.1.0
> 

-- 
Sincerely yours,
Mike.