linux-kernel - Re: linux-next: Tree for May 3

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Message-ID: <20220511141034.GA31732@lst.de>
Date:   Wed, 11 May 2022 16:10:34 +0200
From:   Christoph Hellwig <hch@....de>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     Christoph Hellwig <hch@....de>, Conor.Dooley@...rochip.com,
        sfr@...b.auug.org.au, linux-next@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: linux-next: Tree for May 3

On Wed, May 11, 2022 at 05:08:52PM +0300, Mike Rapoport wrote:
> I guess the default to use memblock_alloc_low() backfires on system with
> physical memory living at 0x1000200000:
> 
> [    0.000000] Early memory node ranges
> [    0.000000]   node   0: [mem 0x0000001000200000-0x000000103fffffff]
> 
> The default limit for "low" memory is 0xffffffff and there is simply no
> memory there.

Is there any way to ask memblock for a specific address limit?
swiotlb just wants <= 32-bit by default.  With the little caveat
that it should be 32-bit addressable for all devices, and we don't
know the physical to dma address mapping at time of allocation.