linux-kernel - Re: [PATCH] mips: sgi-ip27: switch from DISCONTIGMEM to SPARSEMEM

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Date:   Thu, 5 Sep 2019 23:38:00 +0200
From:   Thomas Bogendoerfer <tbogendoerfer@...e.de>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     Paul Burton <paul.burton@...s.com>, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, Mike Rapoport <rppt@...ux.ibm.com>
Subject: Re: [PATCH] mips: sgi-ip27: switch from DISCONTIGMEM to SPARSEMEM

On Thu, 5 Sep 2019 18:47:49 +0300
Mike Rapoport <rppt@...nel.org> wrote:

> On Thu, Sep 05, 2019 at 03:48:31PM +0200, Thomas Bogendoerfer wrote:
> > On Thu, 5 Sep 2019 16:32:53 +0300
> > Mike Rapoport <rppt@...nel.org> wrote:
> > 
> > > On Thu, Sep 05, 2019 at 03:21:50PM +0200, Thomas Bogendoerfer wrote:
> > > > On Thu,  5 Sep 2019 08:47:57 +0300
> > > > Mike Rapoport <rppt@...nel.org> wrote:
> > > > 
> > > > > From: Mike Rapoport <rppt@...ux.ibm.com>
> > > > > 
> > > > > The memory initialization of SGI-IP27 is already half-way to support
> > > > > SPARSEMEM and only a call to sparse_init() was missing. Add it to
> > > > > prom_meminit() and adjust arch/mips/Kconfig to enable SPARSEMEM and
> > > > > SPARSEMEM_EXTREME for SGI-IP27
> > > > > 
> > > > > Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
> > > > > ---
> > > > > 
> > > > > Thomas, could you please test this on your Origin machine?
> > > > 
> > > > it crashes in sparse_early_usemaps_alloc_pgdat_section(). Since there is
> > > > already a sparse_init() in arch_mem_setup() I removed it from ip27-memory.c.
> > > 
> > > Oops, missed that.
> > > 
> > > > With this booting made more progress but I get an unaligned access in
> > > > kernel_init_free_pages(). 
> > > 
> > > Can you please share the log?
> > 
> > sure
> 
> Nothing looked particularly suspicious, but I've found that I've missed the
> definition of pfn_to_nid() is for DISCONTIGMEM only, maybe making it
> available for SPARSE would help :)
> 
> I'm pretty much shooting in the dark here, but can you please try the patch
> below on top of the original one:

doesn't compile: 

/home/tbogendoerfer/wip/mips/linux/include/linux/mmzone.h:1367:0: warning: "pfn_to_nid" redefined
 #define pfn_to_nid(pfn)       \


For testing I've removed the version in linux/mmzone.h, but kernel still crashes. Only
difference is that several CPUs are printing the oops in unaligned handler in parallel.
With the sparse_init() in prom_meminit() kernel dies at the same spot as before.

Thomas.

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