• Heiko Carstens's avatar
    generic bug: use show_regs() instead of dump_stack() · 608e2619
    Heiko Carstens authored
    The current generic bug implementation has a call to dump_stack() in case a
    WARN_ON(whatever) gets hit.  Since report_bug(), which calls dump_stack(),
    gets called from an exception handler we can do better: just pass the
    pt_regs structure to report_bug() and pass it to show_regs() in case of a
    warning.  This will give more debug informations like register contents,
    etc...  In addition this avoids some pointless lines that dump_stack()
    emits, since it includes a stack backtrace of the exception handler which
    is of no interest in case of a warning.  E.g.  on s390 the following lines
    are currently always present in a stack backtrace if dump_stack() gets
    called from report_bug():
    
     [<000000000001517a>] show_trace+0x92/0xe8)
     [<0000000000015270>] show_stack+0xa0/0xd0
     [<00000000000152ce>] dump_stack+0x2e/0x3c
     [<0000000000195450>] report_bug+0x98/0xf8
     [<0000000000016cc8>] illegal_op+0x1fc/0x21c
     [<00000000000227d6>] sysc_return+0x0/0x10
    Acked-by: default avatarJeremy Fitzhardinge <jeremy@goop.org>
    Acked-by: default avatarHaavard Skinnemoen <hskinnemoen@atmel.com>
    Cc: Andi Kleen <ak@suse.de>
    Cc: Kyle McMartin <kyle@parisc-linux.org>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Paul Mundt <lethal@linux-sh.org>
    Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
    Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    608e2619
bug.h 1.1 KB