• Hidehiro Kawai's avatar
    mips/panic: replace smp_send_stop() with kdump friendly version in panic path · 54c721b8
    Hidehiro Kawai authored
    Daniel Walker reported problems which happens when
    crash_kexec_post_notifiers kernel option is enabled
    (https://lkml.org/lkml/2015/6/24/44).
    
    In that case, smp_send_stop() is called before entering kdump routines
    which assume other CPUs are still online.  As the result, kdump
    routines fail to save other CPUs' registers.  Additionally for MIPS
    OCTEON, it misses to stop the watchdog timer.
    
    To fix this problem, call a new kdump friendly function,
    crash_smp_send_stop(), instead of the smp_send_stop() when
    crash_kexec_post_notifiers is enabled.  crash_smp_send_stop() is a
    weak function, and it just call smp_send_stop().  Architecture
    codes should override it so that kdump can work appropriately.
    This patch provides MIPS version.
    
    Fixes: f06e5153 (kernel/panic.c: add "crash_kexec_post_notifiers" option)
    Link: http://lkml.kernel.org/r/20160810080950.11028.28000.stgit@sysi4-13.yrl.intra.hitachi.co.jpSigned-off-by: default avatarHidehiro Kawai <hidehiro.kawai.ez@hitachi.com>
    Reported-by: default avatarDaniel Walker <dwalker@fifo99.com>
    Cc: Dave Young <dyoung@redhat.com>
    Cc: Baoquan He <bhe@redhat.com>
    Cc: Vivek Goyal <vgoyal@redhat.com>
    Cc: Eric Biederman <ebiederm@xmission.com>
    Cc: Masami Hiramatsu <mhiramat@kernel.org>
    Cc: Daniel Walker <dwalker@fifo99.com>
    Cc: Xunlei Pang <xpang@redhat.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Cc: Borislav Petkov <bp@suse.de>
    Cc: David Vrabel <david.vrabel@citrix.com>
    Cc: Toshi Kani <toshi.kani@hpe.com>
    Cc: Ralf Baechle <ralf@linux-mips.org>
    Cc: David Daney <david.daney@cavium.com>
    Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
    Cc: "Steven J. Hill" <steven.hill@cavium.com>
    Cc: Corey Minyard <cminyard@mvista.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    54c721b8
kexec.h 1.55 KB