[PATCH] check that acpi_wakeup_address is below 1MB v2

[matthieu castet <castet.matthieu@xxxxxxx>]

Hi,

this patch add a check that the memory allocated for s3 wakeup is in the 
first 1MB as required by acpi spec.


Signed-off-by: "Matthieu CASTET <castet.matthieu@xxxxxxx>"

diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c
index 6bc815c..6636859 100644
--- a/arch/x86/kernel/acpi/sleep.c
+++ b/arch/x86/kernel/acpi/sleep.c
@@ -65,6 +65,13 @@ void __init acpi_reserve_bootmem(void)
 	acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE*2);
 	if (!acpi_wakeup_address)
 		printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
+	/* check if we are in first 1MB of memory */
+	if (__pa(acpi_wakeup_address) >= 1024*1024-PAGE_SIZE*2) {
+		printk(KERN_ERR "ACPI: Cannot allocate lowmem in first 1MB,"
+				"S3 disabled.\n");
+		free_bootmem(acpi_wakeup_address, PAGE_SIZE*2);
+		acpi_wakeup_address = 0;
+	}
 }