From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Andrey Konovalov <andreyknvl@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Alan Stern <stern@rowland.harvard.edu>,
Shuah Khan <shuah@kernel.org>,
Alexander Potapenko <glider@google.com>,
Marco Elver <elver@google.com>,
Aleksandr Nogikh <nogikh@google.com>,
Nazime Hande Harputluoglu <handeharput@gmail.com>,
tglx@linutronix.de
Subject: Re: [PATCH v4] kcov, usb: only collect coverage from __usb_hcd_giveback_urb in softirq
Date: Fri, 13 Nov 2020 13:30:35 +0100
Message-ID: <20201113123035.tjllvijjzd54npsf@linutronix.de> (raw)
In-Reply-To: <f3a7a153f0719cb53ec385b16e912798bd3e4cf9.1602856358.git.andreyknvl@google.com>
On 2020-10-16 15:57:45 [+0200], Andrey Konovalov wrote:
> --- a/drivers/usb/core/hcd.c
> +++ b/drivers/usb/core/hcd.c
> @@ -1646,9 +1646,16 @@ static void __usb_hcd_giveback_urb(struct urb *urb)
>
> /* pass ownership to the completion handler */
> urb->status = status;
> - kcov_remote_start_usb((u64)urb->dev->bus->busnum);
> + /*
> + * This function can be called in task context inside another remote
> + * coverage collection section, but KCOV doesn't support that kind of
> + * recursion yet. Only collect coverage in softirq context for now.
> + */
> + if (in_serving_softirq())
Could this in_serving_softirq() usage be replaced, please?
> + kcov_remote_start_usb((u64)urb->dev->bus->busnum);
> urb->complete(urb);
> - kcov_remote_stop();
> + if (in_serving_softirq())
> + kcov_remote_stop();
>
> usb_anchor_resume_wakeups(anchor);
> atomic_dec(&urb->use_count);
Sebastian
next prev parent reply index
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-16 13:57 Andrey Konovalov
2020-10-16 14:33 ` Dmitry Vyukov
2020-11-13 12:30 ` Sebastian Andrzej Siewior [this message]
2020-11-13 12:51 ` Andrey Konovalov
2020-11-13 13:28 ` Sebastian Andrzej Siewior
2020-11-13 13:42 ` Andrey Konovalov
2020-11-13 15:32 ` Greg Kroah-Hartman
2020-11-13 15:47 ` Marco Elver
2020-11-23 23:42 ` Andrey Konovalov
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