From: Yinghai Lu <yinghai@kernel.org>
To: "H. Peter Anvin" <hpa@zytor.com>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@elte.hu>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>,
Olaf Hering <olaf@aepfle.de>, Tejun Heo <tj@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: [PATCH] memblock/nobootmem: Allow alloc_bootmem take 0 as low limit
Date: Sun, 08 May 2011 11:35:07 -0700 [thread overview]
Message-ID: <4DC6E25B.90407@kernel.org> (raw)
bootmem wrapper with memblock support top-down now, So do not need set 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 above 16M on system that have small amount of RAM.
Need to apply this one after
[PATCH] mm: Use alloc_bootmem_node_nopanic on really needed path
Signed-off-by: Yinghai LU <yinghai@kernel.org>
---
include/linux/bootmem.h | 25 ++++++++++++++++---------
1 file changed, 16 insertions(+), 9 deletions(-)
Index: linux-2.6/include/linux/bootmem.h
===================================================================
--- linux-2.6.orig/include/linux/bootmem.h
+++ linux-2.6/include/linux/bootmem.h
@@ -99,24 +99,31 @@ extern void *__alloc_bootmem_low_node(pg
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)
reply other threads:[~2011-05-08 18:35 UTC|newest]
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