From: Mark Rutland <mark.rutland@arm.com>
To: Shaokun Zhang <zhangshaokun@hisilicon.com>
Cc: linux-arm-kernel@lists.infradead.org, Will Deacon <will@kernel.org>
Subject: Re: [PATCH -next] arm64: perf: Fix hw_event_id check in __armv8_pmuv3_map_event
Date: Mon, 7 Jun 2021 09:37:04 +0100 [thread overview]
Message-ID: <20210607083704.GA97489@C02TD0UTHF1T.local> (raw)
In-Reply-To: <1623050343-62397-1-git-send-email-zhangshaokun@hisilicon.com>
On Mon, Jun 07, 2021 at 03:19:03PM +0800, Shaokun Zhang wrote:
> Raw event SW_INCR (0x0000) shall be included in this check, so fix it.
>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: Will Deacon <will@kernel.org>
> Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Given that SW_INCR depends on the specific counter used (and userspace
has no control over this), I don't think that it makes sense to expose
to userspace, much like CHAIN, so I suspect it's better to update the
commentary instead.
Do you have a need for SW_INCR, or was this found by inspection?
Thanks,
Mark.
> ---
> arch/arm64/kernel/perf_event.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
> index a661010308c0..fa2f60d09e15 100644
> --- a/arch/arm64/kernel/perf_event.c
> +++ b/arch/arm64/kernel/perf_event.c
> @@ -1000,7 +1000,7 @@ static int __armv8_pmuv3_map_event(struct perf_event *event,
> event->hw.flags |= ARMPMU_EVT_64BIT;
>
> /* Only expose micro/arch events supported by this PMU */
> - if ((hw_event_id > 0) && (hw_event_id < ARMV8_PMUV3_MAX_COMMON_EVENTS)
> + if ((hw_event_id >= 0) && (hw_event_id < ARMV8_PMUV3_MAX_COMMON_EVENTS)
> && test_bit(hw_event_id, armpmu->pmceid_bitmap)) {
> return hw_event_id;
> }
> --
> 2.7.4
>
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next prev parent reply other threads:[~2021-06-07 8:44 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-07 7:19 [PATCH -next] arm64: perf: Fix hw_event_id check in __armv8_pmuv3_map_event Shaokun Zhang
2021-06-07 8:37 ` Mark Rutland [this message]
2021-06-07 10:39 ` Shaokun Zhang
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