Commit 1e3e1972 authored Oct 17, 2007 by Ingo Molnar Committed by Thomas Gleixner Oct 17, 2007

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>

parent f97586b6

arch/x86/kernel/head_32.S

+9 −0

Original line number	Diff line number	Diff line
		@@ -51,6 +51,15 @@
		*/
		LOW_PAGES = 1<<(32-PAGE_SHIFT_asm)

		/*
		* To preserve the DMA pool in PAGEALLOC kernels, we'll allocate
		* pagetables from above the 16MB DMA limit, so we'll have to set
		* up pagetables 16MB more (worst-case):
		*/
		#ifdef CONFIG_DEBUG_PAGEALLOC
		LOW_PAGES = LOW_PAGES + 0x1000000
		#endif

		#if PTRS_PER_PMD > 1
		PAGE_TABLE_SIZE = (LOW_PAGES / PTRS_PER_PMD) + PTRS_PER_PGD
		#else