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memblock: Introduce default allocation limit and use it to replace explicit ones

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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>
This commit is contained in:
Benjamin Herrenschmidt 2010-07-06 15:39:01 -07:00
parent 27f574c223
commit e63075a3c9
14 changed files with 63 additions and 53 deletions
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16
include/linux/memblock.h
View file

@ -34,6 +34,7 @@ struct memblock_type {
struct memblock {
unsigned long debug;
u64 rmo_size;
u64 current_limit;
struct memblock_type memory;
struct memblock_type reserved;
};
@ -46,11 +47,16 @@ extern long memblock_add(u64 base, u64 size);
extern long memblock_remove(u64 base, u64 size);
extern long __init memblock_free(u64 base, u64 size);
extern long __init memblock_reserve(u64 base, u64 size);
extern u64 __init memblock_alloc_nid(u64 size, u64 align, int nid);
extern u64 __init memblock_alloc(u64 size, u64 align);
/* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
#define MEMBLOCK_ALLOC_ANYWHERE (~(u64)0)
#define MEMBLOCK_ALLOC_ACCESSIBLE 0
extern u64 __init memblock_alloc_base(u64 size,
u64, u64 max_addr);
#define MEMBLOCK_ALLOC_ANYWHERE 0
extern u64 __init __memblock_alloc_base(u64 size,
u64 align, u64 max_addr);
extern u64 __init memblock_phys_mem_size(void);
@ -66,6 +72,14 @@ extern void memblock_dump_all(void);
/* Provided by the architecture */
extern u64 memblock_nid_range(u64 start, u64 end, int *nid);
/**
* memblock_set_current_limit - Set the current allocation limit to allow
* limiting allocations to what is currently
* accessible during boot
* @limit: New limit value (physical address)
*/
extern void memblock_set_current_limit(u64 limit);
/*
* pfn conversion functions