forked from Minki/linux
powerpc: fix off by one in max_zone_pfn initialization for ZONE_DMA
25078dc1f7
first introduced an off by one error in the ZONE_DMA initialization of PPC_BOOK3E_64=y and since9739ab7eda
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@redhat.com> Fixes:25078dc1f7
("powerpc: use mm zones more sensibly") Fixes:9739ab7eda
("powerpc: enable a 30-bit ZONE_DMA for 32-bit pmac") Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190625141727.2883-1-aarcange@redhat.com
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@ -249,7 +249,7 @@ void __init paging_init(void)
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#ifdef CONFIG_ZONE_DMA
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max_zone_pfns[ZONE_DMA] = min(max_low_pfn,
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((1UL << ARCH_ZONE_DMA_BITS) - 1) >> PAGE_SHIFT);
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1UL << (ARCH_ZONE_DMA_BITS - PAGE_SHIFT));
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#endif
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max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
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#ifdef CONFIG_HIGHMEM
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