Messages in this thread | | | Date | Mon, 4 Apr 2016 18:02:41 +0200 | From | Peter Zijlstra <> | Subject | Re: [Linux-v4.6-rc1] ext4: WARNING: CPU: 2 PID: 2692 at kernel/locking/lockdep.c:2017 __lock_acquire+0x180e/0x2260 |
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On Mon, Apr 04, 2016 at 05:31:40PM +0200, Sedat Dilek wrote: > > +/* https://en.wikipedia.org/wiki/Xorshift#xorshift.2A */ > > +#define UINT64_C(x) x##ULL > > +static inline u64 xorshift64star(u64 x) > > +{ > > + x ^= x >> 12; // a > > + x ^= x << 25; // b > > + x ^= x >> 27; // c > > + return x * UINT64_C(2685821657736338717); > > +}
> Will you push that also to peterz/queue.git#locking/urgent?
Only after I've had a play and observed it making any difference; Dmitry supposedly has a reproducer, but I've not yet had a moment to try.
> - Sedat - > > P.S.: "lockdep: print chain_key collision information" in your above > tree differs from the upstream one.
I'll drop mine, I just hadn't moved to the very latestestest tip.
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