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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
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3
arch/x86/mm/srat_64.c
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@@ -488,7 +488,8 @@ void __init srat_reserve_add_area(int nodeid)
printk(KERN_INFO "SRAT: This will cost you %Lu MB of "
"pre-allocated memory.\n", (unsigned long long)total_mb);
reserve_bootmem_node(NODE_DATA(nodeid), nodes_add[nodeid].start,
nodes_add[nodeid].end - nodes_add[nodeid].start);
nodes_add[nodeid].end - nodes_add[nodeid].start,
BOOTMEM_DEFAULT);
}
}