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| author | Bernhard Walle <bwalle@suse.de> | 2008-02-07 00:15:17 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-07 08:42:25 -0800 |
| commit | 72a7fe3967dbf86cb34e24fbf1d957fe24d2f246 (patch) | |
| tree | c19f7d0b530577359840e959cce204939caf0649 /arch/s390/kernel | |
| parent | 25fad945a7f7ff2cf06e437381c6a1121784dbd9 (diff) | |
| download | op-kernel-dev-72a7fe3967dbf86cb34e24fbf1d957fe24d2f246.zip op-kernel-dev-72a7fe3967dbf86cb34e24fbf1d957fe24d2f246.tar.gz | |
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/s390/kernel')
| -rw-r--r-- | arch/s390/kernel/setup.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index 29ae165..f9f8779 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -649,21 +649,24 @@ setup_memory(void) /* * Reserve memory used for lowcore/command line/kernel image. */ - reserve_bootmem(0, (unsigned long)_ehead); + reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT); reserve_bootmem((unsigned long)_stext, - PFN_PHYS(start_pfn) - (unsigned long)_stext); + PFN_PHYS(start_pfn) - (unsigned long)_stext, + BOOTMEM_DEFAULT); /* * Reserve the bootmem bitmap itself as well. We do this in two * steps (first step was init_bootmem()) because this catches * the (very unlikely) case of us accidentally initializing the * bootmem allocator with an invalid RAM area. */ - reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size); + reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size, + BOOTMEM_DEFAULT); #ifdef CONFIG_BLK_DEV_INITRD if (INITRD_START && INITRD_SIZE) { if (INITRD_START + INITRD_SIZE <= memory_end) { - reserve_bootmem(INITRD_START, INITRD_SIZE); + reserve_bootmem(INITRD_START, INITRD_SIZE, + BOOTMEM_DEFAULT); initrd_start = INITRD_START; initrd_end = initrd_start + INITRD_SIZE; } else { |
