Messages in this thread | | | Date | Tue, 11 Oct 2016 07:20:49 -0500 | From | Josh Poimboeuf <> | Subject | Re: [PATCH] [RFC] x86: avoid -mtune=atom for objtool warnings |
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On Tue, Oct 11, 2016 at 10:08:12AM +0200, Arnd Bergmann wrote: > On Monday, October 10, 2016 3:23:22 PM CEST Josh Poimboeuf wrote: > > > > Thanks for reporting it. It looks like 'mtune=atom' sometimes makes a > > slight change to one of the stack frame setup instructions. Instead of: > > > > move rsp, rbp > > > > It sometimes does: > > > > lea (%rsp),%rbp > > > > They're two different instructions, but they have the same result. It's > > an easy fix for objtool. I'll post a patch soon. > > > > > > Ah, good to hear. I've replaced my patch with yours in my randconfig > tests now and will let you know if there are any other warnings on > atom. I've done a few thousand x86 randconfig builds now and done private > patches for all warnings I got (I previously had fixes only for the arm > warnings). I found objtool warnings for a few files in some configurations > that do not involve -mtune=atom, maybe you can also look at what > is going on there as I have no idea for how to address them: > > drivers/scsi/fnic/fnic_main.o: warning: objtool: fnic_log_q_error() falls through to next function fnic_handle_link_event() > drivers/scsi/snic/snic_res.o: warning: objtool: .text: unexpected end of section > drivers/infiniband/sw/rxe/rxe_comp.o: warning: objtool: rxe_completer()+0x2f3: sibling call from callable instruction with changed frame pointer > drivers/infiniband/sw/rxe/rxe_resp.o: warning: objtool: rxe_responder()+0x10f: sibling call from callable instruction with changed frame pointer > kernel/locking/rwsem.o: warning: objtool: down_write_killable()+0x16: call without frame pointer save/setup > > I can provide additional information for reproducing them if it's > not immediately obvious what the problems are.
I'm really surprised the 0-day bot didn't find these. I was under the impression that it continuously did a bunch of randconfigs.
Anyway, if you could send the configs for the warnings, that would be very helpful.
I also happen to be working on a significant rewrite of objtool and these configs will come in handy for making a regression suite.
-- Josh
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