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    [PATCH] kdump: Use real pt_regs from exception · 6e274d14
    Alexander Nyberg 提交于
    Makes kexec_crashdump() take a pt_regs * as an argument.  This allows to
    get exact register state at the point of the crash.  If we come from direct
    panic assertion NULL will be passed and the current registers saved before
    crashdump.
    
    This hooks into two places:
    die(): check the conditions under which we will panic when calling
    do_exit and go there directly with the pt_regs that caused the fatal
    fault.
    
    die_nmi(): If we receive an NMI lockup while in the kernel use the
    pt_regs and go directly to crash_kexec(). We're probably nested up badly
    at this point so this might be the only chance to escape with proper
    information.
    Signed-off-by: NAlexander Nyberg <alexn@telia.com>
    Signed-off-by: NAndrew Morton <akpm@osdl.org>
    Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
    6e274d14
kexec.c 27.0 KB