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    Subject[tip:x86/boot] x86/boot: Clarify what x86_legacy_features.reserve_bios_regions does
    Commit-ID:  30f027398b329c75c8f23a3c13be240b50866fdc
    Gitweb: http://git.kernel.org/tip/30f027398b329c75c8f23a3c13be240b50866fdc
    Author: Andy Lutomirski <luto@kernel.org>
    AuthorDate: Thu, 21 Jul 2016 14:16:51 -0700
    Committer: Ingo Molnar <mingo@kernel.org>
    CommitDate: Fri, 22 Jul 2016 11:46:01 +0200

    x86/boot: Clarify what x86_legacy_features.reserve_bios_regions does

    It doesn't just control probing for the EBDA -- it controls whether we
    detect and reserve the <1MB BIOS regions in general.

    Signed-off-by: Andy Lutomirski <luto@kernel.org>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Brian Gerst <brgerst@gmail.com>
    Cc: Denys Vlasenko <dvlasenk@redhat.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Josh Poimboeuf <jpoimboe@redhat.com>
    Cc: Kees Cook <keescook@chromium.org>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Luis R. Rodriguez <mcgrof@suse.com>
    Cc: Mario Limonciello <mario_limonciello@dell.com>
    Cc: Matthew Garrett <mjg59@srcf.ucam.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Toshi Kani <toshi.kani@hp.com>
    Link: http://lkml.kernel.org/r/55bd591115498440d461857a7b64f349a5d911f3.1469135598.git.luto@kernel.org
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    ---
    arch/x86/include/asm/x86_init.h | 5 +++--
    1 file changed, 3 insertions(+), 2 deletions(-)

    diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
    index c519c05..66c15a0 100644
    --- a/arch/x86/include/asm/x86_init.h
    +++ b/arch/x86/include/asm/x86_init.h
    @@ -168,8 +168,9 @@ struct x86_legacy_devices {
    * struct x86_legacy_features - legacy x86 features
    *
    * @rtc: this device has a CMOS real-time clock present
    - * @reserve_bios_regions: it's safe to search for the EBDA signature in the hardware's
    - * low RAM
    + * @reserve_bios_regions: boot code will search for the EBDA address and the
    + * start of the 640k - 1M BIOS region. If false, the platform must
    + * ensure that its memory map correctly reserves sub-1MB regions as needed.
    * @devices: legacy x86 devices, refer to struct x86_legacy_devices
    * documentation for further details.
    */
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