From 8bba154ef29e16331e578029e9050c74b87b7ff9 Mon Sep 17 00:00:00 2001 From: Yinghai Lu Date: Tue, 24 May 2011 17:12:37 -0700 Subject: [PATCH] memblock/nobootmem: allow alloc_bootmem() to take 0 as low limit The bootmem wrapper with memblock supports top-down now, so we do not need to set the low limit to __pa(MAX_DMA_ADDRESS). The logic should be: good to allocate above __pa(MAX_DMA_ADDRESS), but it is ok if we can not find memory above 16M on system that has a small amount of RAM. Signed-off-by: Yinghai LU Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: Olaf Hering Cc: Tejun Heo Cc: Lucas De Marchi Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/bootmem.h | 25 ++++++++++++++++--------- 1 file changed, 16 insertions(+), 9 deletions(-) diff --git a/include/linux/bootmem.h b/include/linux/bootmem.h index 01eca1794e14..ab344a521105 100644 --- a/include/linux/bootmem.h +++ b/include/linux/bootmem.h @@ -99,24 +99,31 @@ extern void *__alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long align, unsigned long goal); +#ifdef CONFIG_NO_BOOTMEM +/* We are using top down, so it is safe to use 0 here */ +#define BOOTMEM_LOW_LIMIT 0 +#else +#define BOOTMEM_LOW_LIMIT __pa(MAX_DMA_ADDRESS) +#endif + #define alloc_bootmem(x) \ - __alloc_bootmem(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS)) + __alloc_bootmem(x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT) #define alloc_bootmem_align(x, align) \ - __alloc_bootmem(x, align, __pa(MAX_DMA_ADDRESS)) + __alloc_bootmem(x, align, BOOTMEM_LOW_LIMIT) #define alloc_bootmem_nopanic(x) \ - __alloc_bootmem_nopanic(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS)) + __alloc_bootmem_nopanic(x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT) #define alloc_bootmem_pages(x) \ - __alloc_bootmem(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS)) + __alloc_bootmem(x, PAGE_SIZE, BOOTMEM_LOW_LIMIT) #define alloc_bootmem_pages_nopanic(x) \ - __alloc_bootmem_nopanic(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS)) + __alloc_bootmem_nopanic(x, PAGE_SIZE, BOOTMEM_LOW_LIMIT) #define alloc_bootmem_node(pgdat, x) \ - __alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS)) + __alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT) #define alloc_bootmem_node_nopanic(pgdat, x) \ - __alloc_bootmem_node_nopanic(pgdat, x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS)) + __alloc_bootmem_node_nopanic(pgdat, x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT) #define alloc_bootmem_pages_node(pgdat, x) \ - __alloc_bootmem_node(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS)) + __alloc_bootmem_node(pgdat, x, PAGE_SIZE, BOOTMEM_LOW_LIMIT) #define alloc_bootmem_pages_node_nopanic(pgdat, x) \ - __alloc_bootmem_node_nopanic(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS)) + __alloc_bootmem_node_nopanic(pgdat, x, PAGE_SIZE, BOOTMEM_LOW_LIMIT) #define alloc_bootmem_low(x) \ __alloc_bootmem_low(x, SMP_CACHE_BYTES, 0) -- 2.11.0