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Date: Thu, 25 Jun 2020 21:35:33 +0200 From: Marco Elver <elver@...gle.com> To: Peter Zijlstra <peterz@...radead.org> Cc: "Paul E. McKenney" <paulmck@...nel.org>, kernel test robot <lkp@...el.com>, kbuild-all@...ts.01.org, LKML <linux-kernel@...r.kernel.org>, Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com> Subject: Re: [rcu:rcu/next 35/35] kernel/rcu/tree.c:251:8: error: implicit declaration of function 'arch_atomic_add_return'; did you mean On Thu, Jun 25, 2020 at 04:11PM +0200, Peter Zijlstra wrote: > On Thu, Jun 25, 2020 at 01:29:26PM +0200, Peter Zijlstra wrote: > > I fear the same. Let me see if I can quickly modify the atomic scripts > > to generate the required fallbacks. > > Something like so ought to work, I suppose. > > --- > Subject: locking/atomics: Provide the arch_atomic_ interface to generic code > From: Peter Zijlstra <peterz@...radead.org> > Date: Thu Jun 25 15:55:14 CEST 2020 > > Architectures with instrumented (KASAN/KCSAN) atomic operations > natively provide arch_atomic_ variants that are not instrumented. > > It turns out that some generic code also requires arch_atomic_ in > order to avoid instrumentation, so provide the arch_atomic_ interface > as a direct map into the regular atomic_ interface for > non-instrumented architectures. > > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org> > --- > include/linux/atomic-fallback.h | 236 +++++++++++++++++++++++++++++++++- > scripts/atomic/gen-atomic-fallback.sh | 31 ++++ > 2 files changed, 266 insertions(+), 1 deletion(-) Thanks, looks reasonable! If noinstr becomes important on architectures that don't implement atomics using arch_ themselves, there might be a problem with CONFIG_TRACE_BRANCH_PROFILING, because unlikely() is used throughout this file. Probably not something to worry about now. Thanks, -- Marco
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