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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2008-07-30 21:24:56 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-07-30 21:24:56 +0100
commitb962a286e500c6259af8ba133361f8528eed9172 (patch)
treecdb19c3ac525cb025dbfb4612decab9e1b030f7b /arch
parent905a09d57afcc49511de18a95605c11ad9c88649 (diff)
[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>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/mm/init.c32
1 files changed, 20 insertions, 12 deletions
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index e6352946dde0..30a69d67d673 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));