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SubjectRe: [sched] c3a340f7e7: invalid_opcode:#[##]
On Tue, Jun 30, 2020 at 04:02:31PM +0200, Peter Zijlstra wrote:
> On Tue, Jun 30, 2020 at 03:55:05PM +0200, Rasmus Villemoes wrote:
>
> > > Consistently so with GCC-4.9. Any other GCC I tried does the sane thing.
> >
> > Does that include gcc 4.8, or is it only "anything newer than 4.9"?
>
> It includes 4.8 :-)
>
> > so the section it was put in has an alignment of 64. The generated
> > assembly is indeed
> >
> > .globl fair_sched_class
> > .section __fair_sched_class,"a",@progbits
> > .align 64
> >
> > /me goes brew coffee
>
> Right.. so I now have the below patch, and with that I get:
>
> 62931: c1e62c20 0 NOTYPE GLOBAL DEFAULT 2 __begin_sched_classes
> 65736: c1e62e40 128 OBJECT GLOBAL DEFAULT 2 stop_sched_class
> 71813: c1e62cc0 128 OBJECT GLOBAL DEFAULT 2 fair_sched_class
> 78689: c1e62c40 128 OBJECT GLOBAL DEFAULT 2 idle_sched_class
> 78953: c1e62ec0 0 NOTYPE GLOBAL DEFAULT 2 __end_sched_classes
> 79090: c1e62d40 128 OBJECT GLOBAL DEFAULT 2 rt_sched_class
> 79431: c1e62dc0 128 OBJECT GLOBAL DEFAULT 2 dl_sched_class
>
>
> Which has me stumped on __begin_sched_classes being on a 32byte edge
> (and crashes differently due to that).

OK, when I look at defconfig-build/arch/x86/kernel/vmlinux.lds I get:

. = ALIGN(32); *(__dummy_sched_class) __begin_sched_classes = .;

So I'm thinking the GCC_VERSION thing works for sched.h but not for
arch//x86/kernel/vmlinux.lds.S, lovely. Let me try and figure out why.

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