Commit-ID: cd670599b7b00d9263f6f11a05c0edeb9cbedaf3 Gitweb: http://git.kernel.org/tip/cd670599b7b00d9263f6f11a05c0edeb9cbedaf3 Author: H. Peter Anvin <hpa@xxxxxxxxx> AuthorDate: Wed, 1 Apr 2009 11:35:00 -0700 Committer: H. Peter Anvin <hpa@xxxxxxxxx> CommitDate: Wed, 1 Apr 2009 11:35:00 -0700 x86, setup: guard against pre-ACPI 3 e820 code not updating %ecx Impact: BIOS bug safety For pre-ACPI 3 BIOSes, pre-initialize the end of the e820 buffer just in case the BIOS returns an unchanged %ecx but without actually touching the ACPI 3 extended flags field. Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxx> --- arch/x86/boot/memory.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/arch/x86/boot/memory.c b/arch/x86/boot/memory.c index d5d2360..5054c2d 100644 --- a/arch/x86/boot/memory.c +++ b/arch/x86/boot/memory.c @@ -31,6 +31,12 @@ static int detect_memory_e820(void) struct e820entry *desc = boot_params.e820_map; static struct e820_ext_entry buf; /* static so it is zeroed */ + /* + * Set this here so that if the BIOS doesn't change this field + * but still doesn't change %ecx, we're still okay... + */ + buf.ext_flags = 1; + do { size = sizeof buf; -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html