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SubjectRe: [PATCH v2 RESEND 1/4] coresight: etm4x: Add lock for reading virtual context ID comparator
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Hi Leo

On 04/02/2022 15:24, Leo Yan wrote:
> Updates to the values and the index are protected via the spinlock.
> Ensure we use the same lock to read the value safely.
>
> Signed-off-by: Leo Yan <leo.yan@linaro.org>
> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
> drivers/hwtracing/coresight/coresight-etm4x-sysfs.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> index 10ef2a29006e..2f3b4eef8261 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> @@ -2111,7 +2111,9 @@ static ssize_t vmid_val_show(struct device *dev,
> struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
> struct etmv4_config *config = &drvdata->config;
>
> + spin_lock(&drvdata->spinlock);
> val = (unsigned long)config->vmid_val[config->vmid_idx];
> + spin_unlock(&drvdata->spinlock);
> return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
> }
>


I have queued this patch. For the rest, we would need to wait
until the helper lands in the rc.

Suzuki

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