x86: prepare page allocator for high allocations on PAGEALLOC=y
To preserve the DMA pool in CONFIG_DEBUG_PAGEALLOC=y kernels, we'll allocate pagetables from above the 16MB DMA limit, so we'll have to set up boot pagetables to cover 16MB more RAM (worst-case). Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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@ -51,6 +51,15 @@
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*/
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LOW_PAGES = 1<<(32-PAGE_SHIFT_asm)
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/*
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* To preserve the DMA pool in PAGEALLOC kernels, we'll allocate
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* pagetables from above the 16MB DMA limit, so we'll have to set
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* up pagetables 16MB more (worst-case):
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*/
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#ifdef CONFIG_DEBUG_PAGEALLOC
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LOW_PAGES = LOW_PAGES + 0x1000000
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#endif
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#if PTRS_PER_PMD > 1
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PAGE_TABLE_SIZE = (LOW_PAGES / PTRS_PER_PMD) + PTRS_PER_PGD
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#else
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