• Thomas Gleixner's avatar
    x86/cpu_entry_area: Move it out of the fixmap · 92a0f81d
    Thomas Gleixner authored
    Put the cpu_entry_area into a separate P4D entry. The fixmap gets too big
    and 0-day already hit a case where the fixmap PTEs were cleared by
    cleanup_highmap().
    
    Aside of that the fixmap API is a pain as it's all backwards.
    Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Dave Hansen <dave.hansen@linux.intel.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Josh Poimboeuf <jpoimboe@redhat.com>
    Cc: Juergen Gross <jgross@suse.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: linux-kernel@vger.kernel.org
    Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
    92a0f81d
cpu_entry_area.c 4.29 KB