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| author | Ingo Molnar <mingo@elte.hu> | 2007-10-17 18:04:34 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@inhelltoy.tec.linutronix.de> | 2007-10-17 20:15:38 +0200 |
| commit | 1e3e19723ecd58149388f3eecbd3285825f64f3b (patch) | |
| tree | 5267cfd354e150412752daa360c548818f24e009 /arch | |
| parent | f97586b610dc87a6494236118321e56ffc13319c (diff) | |
| download | linux-stable-1e3e19723ecd58149388f3eecbd3285825f64f3b.tar.gz linux-stable-1e3e19723ecd58149388f3eecbd3285825f64f3b.tar.bz2 linux-stable-1e3e19723ecd58149388f3eecbd3285825f64f3b.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/head_32.S | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S index 9150ca9b5f80..0fa8a972a679 100644 --- a/arch/x86/kernel/head_32.S +++ b/arch/x86/kernel/head_32.S @@ -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 |