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authorBernhard Walle <bwalle@suse.de>2008-02-07 00:15:17 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-07 08:42:25 -0800
commit72a7fe3967dbf86cb34e24fbf1d957fe24d2f246 (patch)
treec19f7d0b530577359840e959cce204939caf0649 /arch/x86/kernel/setup_64.c
parent25fad945a7f7ff2cf06e437381c6a1121784dbd9 (diff)
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 'arch/x86/kernel/setup_64.c')
-rw-r--r--arch/x86/kernel/setup_64.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
index c8939dfddfb..8345c3b12f0 100644
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -189,7 +189,7 @@ contig_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, end_pfn);
e820_register_active_regions(0, start_pfn, end_pfn);
free_bootmem_with_active_regions(0, end_pfn);
- reserve_bootmem(bootmap, bootmap_size);
+ reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT);
}
#endif
@@ -238,7 +238,8 @@ static void __init reserve_crashkernel(void)
(unsigned long)(free_mem >> 20));
crashk_res.start = crash_base;
crashk_res.end = crash_base + crash_size - 1;
- reserve_bootmem(crash_base, crash_size);
+ reserve_bootmem(crash_base, crash_size,
+ BOOTMEM_DEFAULT);
} else
printk(KERN_INFO "crashkernel reservation failed - "
"you have to specify a base address\n");