[PATCH 1/1] powerpc: fix off by one in max_zone_pfn initialization for ZONE_DMA

Michael Ellerman patch-notifications at ellerman.id.au
Thu Jul 18 23:56:33 AEST 2019

On Tue, 2019-06-25 at 14:17:27 UTC, Andrea Arcangeli wrote:
> 25078dc1f74be16b858e914f52cc8f4d03c2271a first introduced an off by
> one error in the ZONE_DMA initialization of PPC_BOOK3E_64=y and since
> 9739ab7eda459f0669ec9807e0d9be5020bab88c the off by one applies to
> PPC32=y too. This simply corrects the off by one and should resolve
> crashes like below:
> [   65.179101] page 0x7fff outside node 0 zone DMA [ 0x0 - 0x7fff ]
> Unfortunately in various MM places "max" means a non inclusive end of
> range. free_area_init_nodes max_zone_pfn parameter is one case and
> MAX_ORDER is another one (unrelated) that comes by memory.
> Reported-by: Zorro Lang <zlang at redhat.com>
> Fixes: 25078dc1f74b ("powerpc: use mm zones more sensibly")
> Fixes: 9739ab7eda45 ("powerpc: enable a 30-bit ZONE_DMA for 32-bit pmac")
> Signed-off-by: Andrea Arcangeli <aarcange at redhat.com>
> Reviewed-by: Christoph Hellwig <hch at lst.de>

Applied to powerpc fixes, thanks.



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