Messages in this thread | | | Subject | Re: [PATCH] sched: Work around undefined behavior in sched class checking | From | Andi Kleen <> | Date | Wed, 5 May 2021 09:48:58 -0700 |
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On 5/5/2021 9:41 AM, Nick Desaulniers wrote: > On Wed, May 5, 2021 at 7:39 AM Andi Kleen <ak@linux.intel.com> wrote: >>> Would you please provide a >>> minimal test case? >> You can only reproduce it with a LTO build because it needs knowledge >> between different translation units for this specific case. >> >> But gcc will totally do the optimization even without LTO if it can >> prove the same inside a single TU. > It would be helpful to isolate a test case that doesn't rely on LTO, > if possible.
Like I wrote earlier we used to see it all the time in __pa_symbol before it used RELOC_HIDE. I bet if you make RELOC_HIDE a nop you'll see multiple instances.
But not sure why you want a test case?
-Andi
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