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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/frv/kernel
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/frv/kernel')
-rw-r--r--arch/frv/kernel/setup.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/arch/frv/kernel/setup.c b/arch/frv/kernel/setup.c
index b38ae1fc15f..6c01464db69 100644
--- a/arch/frv/kernel/setup.c
+++ b/arch/frv/kernel/setup.c
@@ -925,13 +925,15 @@ static void __init setup_linux_memory(void)
#endif
/* take back the memory occupied by the kernel image and the bootmem alloc map */
- reserve_bootmem(kstart, kend - kstart + bootmap_size);
+ reserve_bootmem(kstart, kend - kstart + bootmap_size,
+ BOOTMEM_DEFAULT);
/* reserve the memory occupied by the initial ramdisk */
#ifdef CONFIG_BLK_DEV_INITRD
if (LOADER_TYPE && INITRD_START) {
if (INITRD_START + INITRD_SIZE <= (low_top_pfn << PAGE_SHIFT)) {
- reserve_bootmem(INITRD_START, INITRD_SIZE);
+ reserve_bootmem(INITRD_START, INITRD_SIZE,
+ BOOTMEM_DEFAULT);
initrd_start = INITRD_START + PAGE_OFFSET;
initrd_end = initrd_start + INITRD_SIZE;
}
@@ -986,9 +988,10 @@ static void __init setup_uclinux_memory(void)
/* now take back the bits the core kernel is occupying */
#ifndef CONFIG_PROTECT_KERNEL
- reserve_bootmem(kend, bootmap_size);
+ reserve_bootmem(kend, bootmap_size, BOOTMEM_DEFAULT);
reserve_bootmem((unsigned long) &__kernel_image_start,
- kend - (unsigned long) &__kernel_image_start);
+ kend - (unsigned long) &__kernel_image_start,
+ BOOTMEM_DEFAULT);
#else
dampr = __get_DAMPR(0);
@@ -996,14 +999,15 @@ static void __init setup_uclinux_memory(void)
dampr = (dampr >> 4) + 17;
dampr = 1 << dampr;
- reserve_bootmem(__get_DAMPR(0) & xAMPRx_PPFN, dampr);
+ reserve_bootmem(__get_DAMPR(0) & xAMPRx_PPFN, dampr, BOOTMEM_DEFAULT);
#endif
/* reserve some memory to do uncached DMA through if requested */
#ifdef CONFIG_RESERVE_DMA_COHERENT
if (dma_coherent_mem_start)
reserve_bootmem(dma_coherent_mem_start,
- dma_coherent_mem_end - dma_coherent_mem_start);
+ dma_coherent_mem_end - dma_coherent_mem_start,
+ BOOTMEM_DEFAULT);
#endif
} /* end setup_uclinux_memory() */