linux-kernel - Re: [PATCH] hexagon: switch to NO

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Date:   Wed, 25 Jul 2018 08:28:09 +0300
From:   Mike Rapoport <rppt@...ux.vnet.ibm.com>
To:     Richard Kuo <rkuo@...eaurora.org>
Cc:     Michal Hocko <mhocko@...nel.org>, linux-hexagon@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hexagon: switch to NO_BOOTMEM

On Tue, Jul 24, 2018 at 09:12:55PM -0500, Richard Kuo wrote:
> On Tue, Jul 24, 2018 at 08:47:04AM +0300, Mike Rapoport wrote:
> > On Mon, Jul 23, 2018 at 04:23:39PM -0500, Richard Kuo wrote:
> > > 
> > > On Mon, Jul 16, 2018 at 10:43:18AM +0300, Mike Rapoport wrote:
> > > > This patch adds registration of the system memory with memblock, eliminates
> > > > bootmem initialization and converts early memory reservations from bootmem
> > > > to memblock.
> > > > 
> > > > Signed-off-by: Mike Rapoport <rppt@...ux.vnet.ibm.com>
> > > 
> > > Sorry for the delay, and thanks for this patch.
> > > 
> > > I think the first memblock_reserve should use ARCH_PFN_OFFSET instead of
> > > PHYS_OFFSET.
> > 
> > memblock_reserve gets physical address rather than a pfn.
> > 
> > If I read arch/hexagon/include/asm/mem-layout.h correctly, the PHYS_OFFSET
> > *is* the physical address of the RAM and ARCH_PFN_OFFSET is the first pfn:
> > 
> > #define PHYS_PFN_OFFSET	(PHYS_OFFSET >> PAGE_SHIFT)
> > #define ARCH_PFN_OFFSET	PHYS_PFN_OFFSET
> > 
> > Did I miss something?
> 
> Sorry, I should have been more clear.  In the size calculation, it's
> subtracting the unshifted PHYS_OFFSET from the start page number, which
> I'm pretty sure is wrong.

Yeah, you're right. I've missed that one.
 
> Thanks,
> Richard Kuo
> 
> 
> -- 
> Employee of Qualcomm Innovation Center, Inc.
> Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, 
> a Linux Foundation Collaborative Project
> 

-- 
Sincerely yours,
Mike.