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Date: Wed, 26 Jul 2017 16:42:07 +0200 From: Paolo Bonzini <pbonzini@...hat.com> To: Arnd Bergmann <arnd@...db.de>, Andrew Morton <akpm@...ux-foundation.org> Cc: Ralf Baechle <ralf@...ux-mips.org>, James Hogan <james.hogan@...tec.com>, Paul Burton <paul.burton@...tec.com>, Peter Zijlstra <peterz@...radead.org>, Juergen Gross <jgross@...e.com>, Ingo Molnar <mingo@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v2] smp_call_function: use inline helpers instead of macros On 26/07/2017 15:32, Arnd Bergmann wrote: > A new caller of smp_call_function() passes a local variable as the 'wait' > argument, and that variable is otherwise unused, so we get a warning > in non-SMP configurations: > > virt/kvm/kvm_main.c: In function 'kvm_make_all_cpus_request': > virt/kvm/kvm_main.c:195:7: error: unused variable 'wait' [-Werror=unused-variable] > bool wait = req & KVM_REQUEST_WAIT; > > This addresses the warning by changing the two macros into inline functions. > As reported by the 0day build bot, a small change is required in the MIPS > r4k code for this, which then gets a warning about a missing variable. > > Fixes: 7a97cec26b94 ("KVM: mark requests that need synchronization") > Cc: Paolo Bonzini <pbonzini@...hat.com> > Link: https://patchwork.kernel.org/patch/9722063/ > Signed-off-by: Arnd Bergmann <arnd@...db.de> This is not needed anymore, I've fixed it in KVM: commit b49defe83659cefbb1763d541e779da32594ab10 Author: Paolo Bonzini <pbonzini@...hat.com> Date: Fri Jun 30 13:25:45 2017 +0200 kvm: avoid unused variable warning for UP builds The uniprocessor version of smp_call_function_many does not evaluate all of its argument, and the compiler emits a warning about "wait" being unused. This breaks the build on architectures for which "-Werror" is enabled by default. Work around it by moving the invocation of smp_call_function_many to its own inline function. Reported-by: Paul Mackerras <paulus@...abs.org> Cc: stable@...r.kernel.org Fixes: 7a97cec26b94c909f4cbad2dc3186af3e457a522 Signed-off-by: Paolo Bonzini <pbonzini@...hat.com> Paolo
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