• Andy Lutomirski's avatar
    x86/boot: Rework reserve_real_mode() to allow multiple tries · 5ff3e2c3
    Andy Lutomirski authored
    If reserve_real_mode() fails, panicing immediately means we're
    doomed.  Make it safe to try more than once to allocate the
    trampoline:
    
     - Degrade a failure from panic() to pr_info().  (If we make it to
       setup_real_mode() without reserving the trampoline, we'll panic
       them.)
    
     - Factor out helpers so that platform code can supply a specific
       address to try.
    
     - Warn if reserve_real_mode() is called after we're done with the
       memblock allocator.  If that were to happen, we would behave
       unpredictably.
    Signed-off-by: default avatarAndy Lutomirski <luto@kernel.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: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Mario Limonciello <mario_limonciello@dell.com>
    Cc: Matt Fleming <mfleming@suse.de>
    Cc: Matthew Garrett <mjg59@srcf.ucam.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Link: http://lkml.kernel.org/r/876e383038f3e9971aa72fd20a4f5da05f9d193d.1470821230.git.luto@kernel.orgSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    5ff3e2c3
init.c 3.73 KB