On Tue, 22 Jan 2019, Joe Lawrence wrote: > This patchset fixes a false negative report (ie, unreliable) from the > ppc64 reliable stack unwinder, discussed here [1] when it may > inadvertently trip over a stale exception marker left on the stack. > > The first two patches fix this bug. Nicolai's change clears the marker > from the stack when an exception is finished. The next patch modifies > the unwinder to only look for such on stack elements when the ABI > guarantees that they will actually be initialized. > > The final two patches consist of code cleanups that Nicolai and I > spotted during the development of the fixes. > > Testing included re-running the original test scenario (loading a > livepatch module on ppc64le) on a 5.0.0-rc2 kernel as well as a RHEL-7 > backport. I ran internal tests on the RHEL-7 backport and no new test > failures were introduced. I believe that Nicolai has done the same > with respect to the first patch. > > [1] https://lore.kernel.org/lkml/7f468285-b149-37e2-e782-c9e538b997a9@xxxxxxxxxx/ > > Joe Lawrence (3): > powerpc/livepatch: relax reliable stack tracer checks for first-frame > powerpc/livepatch: small cleanups in save_stack_trace_tsk_reliable() > powerpc/livepatch: return -ERRNO values in > save_stack_trace_tsk_reliable() > > Nicolai Stange (1): > powerpc/64s: Clear on-stack exception marker upon exception return Michael, are you fine with this going through LP tree, or do you plan to take it through yours? Thanks, -- Jiri Kosina SUSE Labs
