• Michael Neuling's avatar
    powerpc/tm: Fix return of active 64bit signals · 87b4e539
    Michael Neuling authored
    Currently we only restore signals which are transactionally suspended but it's
    possible that the transaction can be restored even when it's active.  Most
    likely this will result in a transactional rollback by the hardware as the
    transaction will have been doomed by an earlier treclaim.
    
    The current code is a legacy of earlier kernel implementations which did
    software rollback of active transactions in the kernel.  That code has now gone
    but we didn't correctly fix up this part of the signals code which still makes
    assumptions based on having software rollback.
    
    This changes the signal return code to always restore both contexts on 64 bit
    signal return.  It also ensures that the MSR TM bits are properly restored from
    the signal context which they are not currently.
    Signed-off-by: default avatarMichael Neuling <mikey@neuling.org>
    cc: stable@vger.kernel.org (v3.9+)
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    87b4e539
signal_64.c 24.8 KB