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

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Message-ID: <20180108153421.GK25869@arm.com>
Date:   Mon, 8 Jan 2018 15:34:21 +0000
From:   Will Deacon <will.deacon@....com>
To:     Yury Norov <ynorov@...iumnetworks.com>
Cc:     Suzuki K Poulose <Suzuki.Poulose@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        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 06:32:25PM +0300, Yury Norov wrote:
> On Mon, Jan 08, 2018 at 03:15:47PM +0000, Will Deacon wrote:
> > 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.
> 
> Hi Will,
> 
> If driver will be merged in linux-next prior to my rework, I can resend
> it with this patch melded. Is it OK for you?

Sure, as long as the arm64 pull hits mainline before the tree carrying your
rework (which probably makes sense for changes like this anyway).

Will