linux-kernel - Re: [PATCH] powerpc/perf: Convert fsl_emb notifier to state machine callbacks

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Date:   Tue, 22 Aug 2023 05:18:45 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] powerpc/perf: Convert fsl_emb notifier to state machine
 callbacks



Le 18/08/2023 à 10:59, Christophe Leroy a écrit :
>    CC      arch/powerpc/perf/core-fsl-emb.o
> arch/powerpc/perf/core-fsl-emb.c:675:6: error: no previous prototype for 'hw_perf_event_setup' [-Werror=missing-prototypes]
>    675 | void hw_perf_event_setup(int cpu)
>        |      ^~~~~~~~~~~~~~~~~~~
> 
> Looks like fsl_emb was completely missed by commit 3f6da3905398 ("perf:
> Rework and fix the arch CPU-hotplug hooks")
> 
> So, apply same changes as commit 3f6da3905398 ("perf: Rework and fix
> the arch CPU-hotplug hooks") then commit 57ecde42cc74 ("powerpc/perf:
> Convert book3s notifier to state machine callbacks")
> 
> While at it, also fix following error:
> 
> arch/powerpc/perf/core-fsl-emb.c: In function 'perf_event_interrupt':
> arch/powerpc/perf/core-fsl-emb.c:648:13: error: variable 'found' set but not used [-Werror=unused-but-set-variable]
>    648 |         int found = 0;
>        |             ^~~~~
> 
> Fixes: 3f6da3905398 ("perf: Rework and fix the arch CPU-hotplug hooks")
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
> Cc: Arnd Bergmann <arnd@...db.de>

Reported-by: kernel test robot <lkp@...el.com>
Closes: 
https://lore.kernel.org/oe-kbuild-all/202308220658.OR5hHFcD-lkp@intel.com/

> ---
>   arch/powerpc/perf/core-fsl-emb.c | 8 +++++---
>   1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/powerpc/perf/core-fsl-emb.c b/arch/powerpc/perf/core-fsl-emb.c
> index ee721f420a7b..1a53ab08447c 100644
> --- a/arch/powerpc/perf/core-fsl-emb.c
> +++ b/arch/powerpc/perf/core-fsl-emb.c
> @@ -645,7 +645,6 @@ static void perf_event_interrupt(struct pt_regs *regs)
>   	struct cpu_hw_events *cpuhw = this_cpu_ptr(&cpu_hw_events);
>   	struct perf_event *event;
>   	unsigned long val;
> -	int found = 0;
>   
>   	for (i = 0; i < ppmu->n_counter; ++i) {
>   		event = cpuhw->event[i];
> @@ -654,7 +653,6 @@ static void perf_event_interrupt(struct pt_regs *regs)
>   		if ((int)val < 0) {
>   			if (event) {
>   				/* event has overflowed */
> -				found = 1;
>   				record_and_restart(event, val, regs);
>   			} else {
>   				/*
> @@ -672,11 +670,13 @@ static void perf_event_interrupt(struct pt_regs *regs)
>   	isync();
>   }
>   
> -void hw_perf_event_setup(int cpu)
> +static int fsl_emb_pmu_prepare_cpu(unsigned int cpu)
>   {
>   	struct cpu_hw_events *cpuhw = &per_cpu(cpu_hw_events, cpu);
>   
>   	memset(cpuhw, 0, sizeof(*cpuhw));
> +
> +	return 0;
>   }
>   
>   int register_fsl_emb_pmu(struct fsl_emb_pmu *pmu)
> @@ -689,6 +689,8 @@ int register_fsl_emb_pmu(struct fsl_emb_pmu *pmu)
>   		pmu->name);
>   
>   	perf_pmu_register(&fsl_emb_pmu, "cpu", PERF_TYPE_RAW);
> +	cpuhp_setup_state(CPUHP_PERF_POWER, "perf/powerpc:prepare",
> +			  fsl_emb_pmu_prepare_cpu, NULL);
>   
>   	return 0;
>   }