Re: [PATCH 1/1] riscv: select CONFIG_ARCH_KEEP_MEMBLOCK

[Kefeng Wang]

On 2021/8/16 23:52, Heinrich Schuchardt wrote:
> On 8/16/21 5:30 PM, Kefeng Wang wrote:
> > On 2021/8/16 22:47, Heinrich Schuchardt wrote:
> > > For analyzing memory blocks we can either use the memblock=debug 
> > > command
> > > line argument which creates massive output or a debug file system.
> > >
> > > Select CONFIG_ARCH_KEEP_MEMBLOCK to provide a debugfs at
> > > /sys/kernel/debug/memblock to analyze memory blocks. The
> > > same is already done for arm, arm64, mips, powerpc.
> > >
> > > The actual provisioning of the file system depends on CONFIG_DEBUG_FS.
> >
> > Hi，for riscv, it don't use memblock(eg, no provide pfn_valid to use 
> > memblock),
> >
> > we could call memblock_discard() to discard memblock private memory 
> > to save
> >
> > some memory, right?  So I think we don't need this config for now.
>
> What do you mean by "it don't use memblock?

Sorry, it should be  "the riscv don't use memblock after the page 
allocator is initialized"