Peter Zijlstra 6cbc304f2f perf/x86/intel: Fix unwind errors from PEBS entries (mk-II) ... Vince reported the perf_fuzzer giving various unwinder warnings and Josh reported: > Deja vu. Most of these are related to perf PEBS, similar to the > following issue: > > b8000586c9 ("perf/x86/intel: Cure bogus unwind from PEBS entries") > > This is basically the ORC version of that. setup_pebs_sample_data() is > assembling a franken-pt_regs which ORC isn't happy about. RIP is > inconsistent with some of the other registers (like RSP and RBP). And where the previous unwinder only needed BP,SP ORC also requires IP. But we cannot spoof IP because then the sample will get displaced, entirely negating the point of PEBS. So cure the whole thing differently by doing the unwind early; this does however require a means to communicate we did the unwind early. We (ab)use an unused sample_type bit for this, which we set on events that fill out the data->callchain before the normal perf_prepare_sample(). Debugged-by: Josh Poimboeuf <jpoimboe@redhat.com> Reported-by: Vince Weaver <vincent.weaver@maine.edu> Tested-by: Josh Poimboeuf <jpoimboe@redhat.com> Tested-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>		2018-07-25 11:46:21 +02:00
..
acpi	ACPI / processor: Finish making acpi_processor_ppc_has_changed() void	2018-06-20 10:50:40 +02:00
asm-generic	mm: allow arch to supply p??_free_tlb functions	2018-07-14 11:11:09 -07:00
clocksource
crypto	Revert changes to convert to ->poll_mask() and aio IOCB_CMD_POLL	2018-06-28 10:40:47 -07:00
drm
dt-bindings	dt-bindings: clock: imx6ul: Do not change the clock definition order	2018-06-29 11:40:20 -07:00
keys	docs: Fix some broken references	2018-06-15 18:10:01 -03:00
kvm
linux	perf/x86/intel: Fix unwind errors from PEBS entries (mk-II)	2018-07-25 11:46:21 +02:00
math-emu
media
memory
misc
net	ipv6: fix useless rol32 call on hash	2018-07-18 15:11:09 -07:00
pcmcia
ras
rdma	4.18-rc	2018-06-21 07:22:30 +09:00
scsi	SCSI misc on 20180610	2018-06-10 13:01:12 -07:00
soc	ARM: SoC: late updates	2018-06-11 18:19:45 -07:00
sound
target
trace	NFS client updates for Linux 4.18	2018-06-12 10:09:03 -07:00
uapi	perf/x86/intel: Fix unwind errors from PEBS entries (mk-II)	2018-07-25 11:46:21 +02:00
video	fbdev changes for v4.18:	2018-06-17 05:00:24 +09:00
xen	xen: fixes for 4.18-rc2	2018-06-23 20:44:11 +08:00