linux-kernel - Re: [PATCH] coresight replicator: set default y after Kconfig rename

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Date:   Fri, 9 Feb 2018 09:51:52 +0000
From:   Suzuki K Poulose <Suzuki.Poulose@....com>
To:     Kim Phillips <kim.phillips@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] coresight replicator: set default y after Kconfig rename

On 07/02/18 21:03, Kim Phillips wrote:
> Commit 1c8859848dbb ("coresight replicator: Cleanup programmable
> replicator naming") changed the Kconfig symbol name from
> QCOM_REPLICATOR, which, whilst not in the single arm64 defconfig,
> was being set in my juno build script, which left the new symbol unset,
> causing the following unexpected grief:
> 
>   # ./perf record -vvv -C 0 -e cs_etm/@...70000.etr/ --per-thread true
>   ..<snip>..
>   sys_perf_event_open: pid -1  cpu 0  group_fd -1  flags 0x8 = 5
>   mmap size 528384B
>   AUX area mmap length 4194304
>   perf event ring buffer mmapped per cpu
>   failed to mmap AUX area
>   failed to mmap with 12 (Cannot allocate memory)
> 
> Make it default y to help not surprise unsuspecting users.

I think the best way to address this issue is to set the proper errno when
we fail to build a path, say -ENODEV, that could give us a better clue
on what is going wrong. Have you checked the dmesg to see if it complains
about "build path" failure ?

Cheers
Suzuki