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Introduce flags for reserve_bootmem()

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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>
This commit is contained in:
Bernhard Walle
2008-02-07 00:15:17 -08:00
committed by Linus Torvalds
parent 25fad945a7
commit 72a7fe3967
43 changed files with 183 additions and 105 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
arch/avr32/kernel/setup.c
View File

@ -489,7 +489,8 @@ static void __init setup_bootmem(void)
/* Reserve space for the bootmem bitmap... */
reserve_bootmem_node(NODE_DATA(node),
PFN_PHYS(bootmap_pfn),
bootmap_size);
bootmap_size,
BOOTMEM_DEFAULT);
/* ...and any other reserved regions. */
for (res = reserved; res; res = res->sibling) {
@ -505,7 +506,8 @@ static void __init setup_bootmem(void)
&& res->end < PFN_PHYS(max_pfn))
reserve_bootmem_node(
NODE_DATA(node), res->start,
res->end - res->start + 1);
res->end - res->start + 1,
BOOTMEM_DEFAULT);
}
node_set_online(node);