diff options
| author | Bernhard Walle <bwalle@suse.de> | 2008-02-07 11:15:17 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-07 19:42:25 +0300 |
| commit | 72a7fe3967dbf86cb34e24fbf1d957fe24d2f246 (patch) | |
| tree | c19f7d0b530577359840e959cce204939caf0649 /include/linux/bootmem.h | |
| parent | 25fad945a7f7ff2cf06e437381c6a1121784dbd9 (diff) | |
| download | linux-72a7fe3967dbf86cb34e24fbf1d957fe24d2f246.tar.xz | |
Introduce flags for reserve_bootmem()
This patchset adds a flags variable to reserve_bootmem() and uses the
BOOTMEM_EXCLUSIVE flag in crashkernel reservation code to detect collisions
between crashkernel area and already used memory.
This patch:
Change the reserve_bootmem() function to accept a new flag BOOTMEM_EXCLUSIVE.
If that flag is set, the function returns with -EBUSY if the memory already
has been reserved in the past. This is to avoid conflicts.
Because that code runs before SMP initialisation, there's no race condition
inside reserve_bootmem_core().
[akpm@linux-foundation.org: coding-style fixes]
[akpm@linux-foundation.org: fix powerpc build]
Signed-off-by: Bernhard Walle <bwalle@suse.de>
Cc: <linux-arch@vger.kernel.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/bootmem.h')
| -rw-r--r-- | include/linux/bootmem.h | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/include/linux/bootmem.h b/include/linux/bootmem.h index 0365ec9fc0c9..4e4e340592fb 100644 --- a/include/linux/bootmem.h +++ b/include/linux/bootmem.h @@ -60,8 +60,20 @@ extern void *__alloc_bootmem_core(struct bootmem_data *bdata, unsigned long goal, unsigned long limit); +/* + * flags for reserve_bootmem (also if CONFIG_HAVE_ARCH_BOOTMEM_NODE, + * the architecture-specific code should honor this) + */ +#define BOOTMEM_DEFAULT 0 +#define BOOTMEM_EXCLUSIVE (1<<0) + #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE -extern void reserve_bootmem(unsigned long addr, unsigned long size); +/* + * If flags is 0, then the return value is always 0 (success). If + * flags contains BOOTMEM_EXCLUSIVE, then -EBUSY is returned if the + * memory already was reserved. + */ +extern int reserve_bootmem(unsigned long addr, unsigned long size, int flags); #define alloc_bootmem(x) \ __alloc_bootmem(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS)) #define alloc_bootmem_low(x) \ @@ -84,7 +96,8 @@ extern unsigned long init_bootmem_node(pg_data_t *pgdat, unsigned long endpfn); extern void reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr, - unsigned long size); + unsigned long size, + int flags); extern void free_bootmem_node(pg_data_t *pgdat, unsigned long addr, unsigned long size); |