On Tue, 2017-04-18 at 16:38:17 UTC, Mahesh Salgaonkar wrote: > From: Mahesh Salgaonkar <mah...@linux.vnet.ibm.com> > > machine_check_early() gets called in real mode. The very first time when > add_taint() is called, it prints a warning which ends up calling opal > call (that uses OPAL_CALL wrapper) for writing it to console. If we get a > very first machine check while we are in opal we are doomed. OPAL_CALL > overwrites the PACASAVEDMSR in r13 and in this case when we are done with > MCE handling the original opal call will use this new MSR on it's way > back to opal_return. This usually leads unexpected behaviour or kernel > to panic. Instead move the add_taint() call later in the virtual mode > where it is safe to call. > > This is broken with current FW level. We got lucky so far for not getting > very first MCE hit while in OPAL. But easily reproducible on Mambo. > This should go to stable. > > Fixes: 27ea2c420cad powerpc: Set the correct kernel taint on machine check > errors. > Signed-off-by: Mahesh Salgaonkar <mah...@linux.vnet.ibm.com>
Applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/d93b0ac01a9ce276ec39644be47001 cheers
