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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2010-07-07 02:39:01 +0400
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2010-08-05 06:56:07 +0400
commite63075a3c9377536d085bc013cd3fe6323162449 (patch)
tree28fde124dde6df867947882fc686d228502846df /arch/powerpc/mm/init_32.c
parent27f574c223d2c09610058b3ec7a29582d63a3e06 (diff)
downloadlinux-e63075a3c9377536d085bc013cd3fe6323162449.tar.xz
memblock: Introduce default allocation limit and use it to replace explicit ones
This introduce memblock.current_limit which is used to limit allocations from memblock_alloc() or memblock_alloc_base(..., MEMBLOCK_ALLOC_ACCESSIBLE). The old MEMBLOCK_ALLOC_ANYWHERE changes value from 0 to ~(u64)0 and can still be used with memblock_alloc_base() to allocate really anywhere. It is -no-longer- cropped to MEMBLOCK_REAL_LIMIT which disappears. Note to archs: I'm leaving the default limit to MEMBLOCK_ALLOC_ANYWHERE. I strongly recommend that you ensure that you set an appropriate limit during boot in order to guarantee that an memblock_alloc() at any time results in something that is accessible with a simple __va(). The reason is that a subsequent patch will introduce the ability for the array to resize itself by reallocating itself. The MEMBLOCK core will honor the current limit when performing those allocations. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/mm/init_32.c')
-rw-r--r--arch/powerpc/mm/init_32.c29
1 files changed, 7 insertions, 22 deletions
diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c
index 6a6975dc2654..59b208b7ec6f 100644
--- a/arch/powerpc/mm/init_32.c
+++ b/arch/powerpc/mm/init_32.c
@@ -92,12 +92,6 @@ int __allow_ioremap_reserved;
unsigned long __max_low_memory = MAX_LOW_MEM;
/*
- * address of the limit of what is accessible with initial MMU setup -
- * 256MB usually, but only 16MB on 601.
- */
-phys_addr_t __initial_memory_limit_addr = (phys_addr_t)0x10000000;
-
-/*
* Check for command-line options that affect what MMU_init will do.
*/
void MMU_setup(void)
@@ -126,13 +120,6 @@ void __init MMU_init(void)
if (ppc_md.progress)
ppc_md.progress("MMU:enter", 0x111);
- /* 601 can only access 16MB at the moment */
- if (PVR_VER(mfspr(SPRN_PVR)) == 1)
- __initial_memory_limit_addr = 0x01000000;
- /* 8xx can only access 8MB at the moment */
- if (PVR_VER(mfspr(SPRN_PVR)) == 0x50)
- __initial_memory_limit_addr = 0x00800000;
-
/* parse args from command line */
MMU_setup();
@@ -190,20 +177,18 @@ void __init MMU_init(void)
#ifdef CONFIG_BOOTX_TEXT
btext_unmap();
#endif
+
+ /* Shortly after that, the entire linear mapping will be available */
+ memblock_set_current_limit(lowmem_end_addr);
}
/* This is only called until mem_init is done. */
void __init *early_get_page(void)
{
- void *p;
-
- if (init_bootmem_done) {
- p = alloc_bootmem_pages(PAGE_SIZE);
- } else {
- p = __va(memblock_alloc_base(PAGE_SIZE, PAGE_SIZE,
- __initial_memory_limit_addr));
- }
- return p;
+ if (init_bootmem_done)
+ return alloc_bootmem_pages(PAGE_SIZE);
+ else
+ return __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE));
}
/* Free up now-unused memory */