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    SubjectRe: [PATCH 1/3] coredump: flush the fpu exit state for proper multi-threaded core dump
    On 05/08, Suresh Siddha wrote:
    > --- a/kernel/exit.c
    > +++ b/kernel/exit.c
    > @@ -656,6 +656,11 @@ static void exit_mm(struct task_struct * tsk)
    > struct core_thread self;
    > up_read(&mm->mmap_sem);
    > + /*
    > + * Flush the live extended register state to memory.
    > + */
    > + prepare_to_copy(tsk);

    This doesn't look very nice imho, but I guess you understand this...

    Perhaps we need an arch-dependent helper which saves the FPU regs
    if needed.

    I can be easily wrong, but I did the quick grep and I am not sure
    we can rely on prepare_to_copy(). For example, it is a nop in
    arch/sh/include/asm/processor_64.h. But at the same time it has

    OTOH, I am not sure it is safe to use prepare_to_copy() in exit_mm(),
    at least in theory. God knows what it can do...

    But again, I do not think I can comment this change. Perhaps this
    is the right step anyway.


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      Last update: 2012-05-09 23:41    [W:0.027 / U:1.184 seconds]
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