linux-kernel - Re: [PATCH net-next v2 5/6] rust: Add read_poll

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Message-Id: <20241015.123653.216260102436009448.fujita.tomonori@gmail.com>
Date: Tue, 15 Oct 2024 12:36:53 +0900 (JST)
From: FUJITA Tomonori <fujita.tomonori@...il.com>
To: boqun.feng@...il.com
Cc: andrew@...n.ch, fujita.tomonori@...il.com, netdev@...r.kernel.org,
 rust-for-linux@...r.kernel.org, hkallweit1@...il.com, tmgross@...ch.edu,
 ojeda@...nel.org, alex.gaynor@...il.com, gary@...yguo.net,
 bjorn3_gh@...tonmail.com, benno.lossin@...ton.me, a.hindborg@...sung.com,
 aliceryhl@...gle.com, anna-maria@...utronix.de, frederic@...nel.org,
 tglx@...utronix.de, arnd@...db.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 5/6] rust: Add read_poll_timeout function

On Sat, 5 Oct 2024 15:22:23 -0700
Boqun Feng <boqun.feng@...il.com> wrote:

> On Sat, Oct 05, 2024 at 08:32:01PM +0200, Andrew Lunn wrote:
>> > might_sleep() is called via a wrapper so the __FILE__ and __LINE__
>> > debug info with CONFIG_DEBUG_ATOMIC_SLEEP enabled isn't what we
>> > expect; the wrapper instead of the caller.
>> 
>> So not very useful. All we know is that somewhere in Rust something is
>> sleeping in atomic context. Is it possible to do better? Does __FILE__
>> and __LINE__ exist in Rust?
>> 
> 
> Sure, you can use: 
> 
> 	https://doc.rust-lang.org/core/macro.line.html

To get the proper file name and line number with those macros, we need
to use __might_sleep() instead of might_sleep(). We could also call to
might_resched() there to emulate might_sleep() but fsleep() works
without it so I call only __might_sleep() in the next version.