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>
diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c
index aa875fa..eb80f5e 100644
--- a/arch/parisc/mm/init.c
+++ b/arch/parisc/mm/init.c
@@ -315,11 +315,13 @@
#define PDC_CONSOLE_IO_IODC_SIZE 32768
reserve_bootmem_node(NODE_DATA(0), 0UL,
- (unsigned long)(PAGE0->mem_free + PDC_CONSOLE_IO_IODC_SIZE));
+ (unsigned long)(PAGE0->mem_free +
+ PDC_CONSOLE_IO_IODC_SIZE), BOOTMEM_DEFAULT);
reserve_bootmem_node(NODE_DATA(0), __pa((unsigned long)_text),
- (unsigned long)(_end - _text));
+ (unsigned long)(_end - _text), BOOTMEM_DEFAULT);
reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT),
- ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT));
+ ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT),
+ BOOTMEM_DEFAULT);
#ifndef CONFIG_DISCONTIGMEM
@@ -328,7 +330,8 @@
for (i = 0; i < npmem_holes; i++) {
reserve_bootmem_node(NODE_DATA(0),
(pmem_holes[i].start_pfn << PAGE_SHIFT),
- (pmem_holes[i].pages << PAGE_SHIFT));
+ (pmem_holes[i].pages << PAGE_SHIFT),
+ BOOTMEM_DEFAULT);
}
#endif
@@ -346,7 +349,8 @@
initrd_below_start_ok = 1;
printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max);
- reserve_bootmem_node(NODE_DATA(0),__pa(initrd_start), initrd_reserve);
+ reserve_bootmem_node(NODE_DATA(0), __pa(initrd_start),
+ initrd_reserve, BOOTMEM_DEFAULT);
}
}
#endif