Messages in this thread | | | Date | Mon, 06 Apr 2020 11:39:19 +1000 | From | Nicholas Piggin <> | Subject | Re: [RFC PATCH v2 13/13] powerpc/kernel: Do not use READ_ONCE() to access current thread_info flags |
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Christophe Leroy's on April 6, 2020 3:44 am: > current is a volatile pointer hold by r2 register. > > READ_ONCE() is not required. > > Before: 327 cycles on null_syscall > Before: 325 cycles on null_syscall
Patches against Michael's next-test branch have a few small changes here. I need to look at the fallout on 64-bit code, although most likely it's not measurable so if it saves you a few cycles we can lean toward what ppc32 prefers.
Same with the compat test.
Thanks, Nick
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