Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b962a2...
Commit: b962a286e500c6259af8ba133361f8528eed9172
Parent: 905a09d57afcc49511de18a95605c11ad9c88649
Author: Russell King <rmk@dyn-67.arm.linux.org.uk>
AuthorDate: Wed Jul 30 21:24:56 2008 +0100
Committer: Russell King <rmk+kernel@arm.linux.org.uk>
CommitDate: Wed Jul 30 21:24:56 2008 +0100
[ARM] initrd: claim initrd memory exclusively
Claim the initrd memory exclusively, and order other memory
reservations beforehand. This allows us to determine whether
the initrd memory was overwritten, and disable the initrd in
that case.
This avoids a 'bad page state' bug.
Tested-by: Ralph Siemsen <ralphs@netwinder.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
arch/arm/mm/init.c | 32 ++++++++++++++++++++------------
1 files changed, 20 insertions(+), 12 deletions(-)
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index e635294..30a69d6 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -156,9 +156,9 @@ static int __init check_initrd(struct meminfo *mi)
}
if (initrd_node == -1) {
- printk(KERN_ERR "initrd (0x%08lx - 0x%08lx) extends beyond "
+ printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond "
"physical memory - disabling initrd\n",
- phys_initrd_start, end);
+ phys_initrd_start, phys_initrd_size);
phys_initrd_start = phys_initrd_size = 0;
}
#endif
@@ -239,25 +239,33 @@ bootmem_init_node(int node, int initrd_node, struct meminfo *mi)
reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT,
boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
+ /*
+ * Reserve any special node zero regions.
+ */
+ if (node == 0)
+ reserve_node_zero(pgdat);
+
#ifdef CONFIG_BLK_DEV_INITRD
/*
* If the initrd is in this node, reserve its memory.
*/
if (node == initrd_node) {
- reserve_bootmem_node(pgdat, phys_initrd_start,
- phys_initrd_size, BOOTMEM_DEFAULT);
- initrd_start = __phys_to_virt(phys_initrd_start);
- initrd_end = initrd_start + phys_initrd_size;
+ int res = reserve_bootmem_node(pgdat, phys_initrd_start,
+ phys_initrd_size, BOOTMEM_EXCLUSIVE);
+
+ if (res == 0) {
+ initrd_start = __phys_to_virt(phys_initrd_start);
+ initrd_end = initrd_start + phys_initrd_size;
+ } else {
+ printk(KERN_ERR
+ "INITRD: 0x%08lx+0x%08lx overlaps in-use "
+ "memory region - disabling initrd\n",
+ phys_initrd_start, phys_initrd_size);
+ }
}
#endif
/*
- * Finally, reserve any node zero regions.
- */
- if (node == 0)
- reserve_node_zero(pgdat);
-
- /*
* initialise the zones within this node.
*/
memset(zone_size, 0, sizeof(zone_size));
--
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