• Peter Zijlstra's avatar
    debug: Add _ONCE() logic to report_bug() · 19d43626
    Peter Zijlstra authored
    Josh suggested moving the _ONCE logic inside the trap handler, using a
    bit in the bug_entry::flags field, avoiding the need for the extra
    Sadly this only works for WARN_ON_ONCE(), since the others have
    printk() statements prior to triggering the trap.
    Still, this saves a fair amount of text and some data:
      text         data       filename
      10682460     4530992    defconfig-build/vmlinux.orig
      10665111     4530096    defconfig-build/vmlinux.patched
    Suggested-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
    Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Arnd Bergmann <arnd@arndb.de>
    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: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
bug.h 4.51 KB