• Nick Piggin's avatar
    generic-ipi: fix stack and rcu interaction bug in smp_call_function_mask(), fix · c2fc1198
    Nick Piggin authored
    > > Nick Piggin (1):
    > >       generic-ipi: fix stack and rcu interaction bug in
    > > smp_call_function_mask()
    >
    > I'm still not 100% sure that I have this patch right... I might have seen
    > a lockup trace implicating the smp call function path... which may have
    > been due to some other problem or a different bug in the new call function
    > code, but if some more people can take a look at it before merging?
    
    OK indeed it did have a couple of bugs. Firstly, I wasn't freeing the
    data properly in the alloc && wait case. Secondly, I wasn't resetting
    CSD_FLAG_WAIT in the for each cpu loop (so only the first CPU would
    wait).
    
    After those fixes, the patch boots and runs with the kmalloc commented
    out (so it always executes the slowpath).
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    c2fc1198
smp.c 10.5 KB