On Mon, May 26, 2014 at 04:39:35PM +0800, Dave Young wrote:
>
> For efi=old_map and any old_map quirks like SGI UV in current
> tree kexec/kdump will fail because it depends on the new 1:1 mapping.
>
> Thus export the mapping method to sysfs so kexec tools can switch
> to original way to boot.
>
> Since we have efi.flags for all efi facilities so let's just export the
> efi.flags itself, it maybe useful for other arches and use cases.
>
Does it require any documentation in Documentation/ABI/..
Vivek
> Signed-off-by: Dave Young <dyo...@redhat.com>
> ---
> drivers/firmware/efi/efi.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> Index: linux-2.6/drivers/firmware/efi/efi.c
> ===================================================================
> --- linux-2.6.orig/drivers/firmware/efi/efi.c
> +++ linux-2.6/drivers/firmware/efi/efi.c
> @@ -86,16 +86,19 @@ static ssize_t name##_show(struct kobjec
> EFI_ATTR_SHOW(fw_vendor);
> EFI_ATTR_SHOW(runtime);
> EFI_ATTR_SHOW(config_table);
> +EFI_ATTR_SHOW(flags);
>
> static struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor);
> static struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime);
> static struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table);
> +static struct kobj_attribute efi_attr_flags = __ATTR_RO(flags);
>
> static struct attribute *efi_subsys_attrs[] = {
> &efi_attr_systab.attr,
> &efi_attr_fw_vendor.attr,
> &efi_attr_runtime.attr,
> &efi_attr_config_table.attr,
> + &efi_attr_flags.attr,
> NULL,
> };
>
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