linux-kernel - Re: [PATCH] perf: arm_dsu_pmu: convert to bitmap_from

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Date:   Mon, 8 Jan 2018 15:15:47 +0000
From:   Will Deacon <will.deacon@....com>
To:     Suzuki K Poulose <Suzuki.Poulose@....com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Yury Norov <ynorov@...iumnetworks.com>,
        Mark Rutland <mark.rutland@....com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf: arm_dsu_pmu: convert to bitmap_from_arr32

On Mon, Jan 08, 2018 at 02:56:24PM +0000, Suzuki K Poulose wrote:
> On 08/01/18 12:48, Arnd Bergmann wrote:
> >The bitmap_from_u32array() interface got replaced in a global
> >change, but the arm_dsu_pmu driver adds another instance,
> >resulting in a build failure:
> >
> >drivers/perf/arm_dsu_pmu.c: In function 'dsu_pmu_probe_pmu':
> >drivers/perf/arm_dsu_pmu.c:661:2: error: implicit declaration of function 'bitmap_from_u32array'; did you mean 'bitmap_from_arr32'? [-Werror=implicit-function-declaration]
> >
> >This changes the new instance accordingly.
> >
> >Fixes: mmotm ("bitmap: replace bitmap_{from,to}_u32array")
> >Fixes: 7520fa99246d ("perf: ARM DynamIQ Shared Unit PMU support")
> >Signed-off-by: Arnd Bergmann <arnd@...db.de>
> >---
> >The global change is currently in linux-mm, so it should be
> >possible to just fold this patch into it, without causing
> >extra work.
> >---
> >  drivers/perf/arm_dsu_pmu.c | 6 ++----
> >  1 file changed, 2 insertions(+), 4 deletions(-)
> >
> >diff --git a/drivers/perf/arm_dsu_pmu.c b/drivers/perf/arm_dsu_pmu.c
> >index 37c0526c93d5..e2700888a7d9 100644
> >--- a/drivers/perf/arm_dsu_pmu.c
> >+++ b/drivers/perf/arm_dsu_pmu.c
> >@@ -658,10 +658,8 @@ static void dsu_pmu_probe_pmu(struct dsu_pmu *dsu_pmu)
> >  		return;
> >  	cpmceid[0] = __dsu_pmu_read_pmceid(0);
> >  	cpmceid[1] = __dsu_pmu_read_pmceid(1);
> >-	bitmap_from_u32array(dsu_pmu->cpmceid_bitmap,
> >-				DSU_PMU_MAX_COMMON_EVENTS,
> >-				cpmceid,
> >-				ARRAY_SIZE(cpmceid));
> >+	bitmap_from_arr32(dsu_pmu->cpmceid_bitmap, cpmceid,
> >+			  DSU_PMU_MAX_COMMON_EVENTS);
> >  }
> >  static void dsu_pmu_set_active_cpu(int cpu, struct dsu_pmu *dsu_pmu)
> >
> 
> Arnd,
> 
> Thanks for fixing this. FWIW,
> 
> Acked-by: Suzuki K Poulose <suzuki.poulose@....com>

Hmm, what's the best way to get this upstream? The PMU driver is likely to
be queued via arm64 soon, but this fixup doesn't apply there.

Will