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[103.168.172.200]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-87cf521c120sm80452916d6.20.2025.10.21.20.42.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Oct 2025 20:42:39 -0700 (PDT) Received: from phl-compute-10.internal (phl-compute-10.internal [10.202.2.50]) by mailfauth.phl.internal (Postfix) with ESMTP id 4BB81F40067; Tue, 21 Oct 2025 23:42:39 -0400 (EDT) Received: from phl-mailfrontend-01 ([10.202.2.162]) by phl-compute-10.internal (MEProxy); Tue, 21 Oct 2025 23:42:39 -0400 X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeeffedrtdeggddugedvheefucetufdoteggodetrf dotffvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfurfetoffkrfgpnffqhgenuceu rghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujf gurhephffvvefufffkofgjfhgggfestdekredtredttdenucfhrhhomhepuehoqhhunhcu hfgvnhhguceosghoqhhunhdrfhgvnhhgsehgmhgrihhlrdgtohhmqeenucggtffrrghtth gvrhhnpeegleejiedthedvheeggfejveefjeejkefgveffieeujefhueeigfegueehgeeg gfenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhgrihhlfhhrohhmpegsoh hquhhnodhmvghsmhhtphgruhhthhhpvghrshhonhgrlhhithihqdeiledvgeehtdeigedq udejjeekheehhedvqdgsohhquhhnrdhfvghngheppehgmhgrihhlrdgtohhmsehfihigmh gvrdhnrghmvgdpnhgspghrtghpthhtohepudelpdhmohguvgepshhmthhpohhuthdprhgt phhtthhopehpvghtvghriiesihhnfhhrrgguvggrugdrohhrghdprhgtphhtthhopegurg hnihgvlhdrrghlmhgvihgurgestgholhhlrggsohhrrgdrtghomhdprhgtphhtthhopehm mhgruhhrvghrsehgohhoghhlvgdrtghomhdprhgtphhtthhopegurghkrheskhgvrhhnvg hlrdhorhhgpdhrtghpthhtohepshhfrhestggrnhgsrdgruhhughdrohhrghdrrghupdhr tghpthhtohepthhglhigsehlihhnuhhtrhhonhhigidruggvpdhrtghpthhtohepmhhinh hgoheskhgvrhhnvghlrdhorhhgpdhrtghpthhtohephhhprgesiiihthhorhdrtghomhdp rhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrgh X-ME-Proxy: Feedback-ID: iad51458e:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Tue, 21 Oct 2025 23:42:38 -0400 (EDT) From: Boqun Feng To: Peter Zijlstra , Daniel Almeida , Matthew Maurer , Danilo Krummrich Cc: Stephen Rothwell , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , linux-kernel@vger.kernel.org, linux-next@vger.kernel.org, Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , lossin@kernel.org, Andreas Hindborg , Alice Ryhl , Trevor Gross , rust-for-linux@vger.kernel.org Subject: [PATCH] rust: debugfs: Implement Reader for Mutex only when T is Unpin Date: Tue, 21 Oct 2025 23:42:37 -0400 Message-ID: <20251022034237.70431-1-boqun.feng@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Since we are going to make `Mutex` structurally pin the data (i.e. `T`), therefore `.lock()` function only returns a `Guard` that can dereference a mutable reference to `T` if only `T` is `Unpin`, therefore restrict the impl `Reader` block of `Mutex` to that. Signed-off-by: Boqun Feng --- rust/kernel/debugfs/traits.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/rust/kernel/debugfs/traits.rs b/rust/kernel/debugfs/traits.rs index ab009eb254b3..ba7ec5a900b8 100644 --- a/rust/kernel/debugfs/traits.rs +++ b/rust/kernel/debugfs/traits.rs @@ -50,7 +50,7 @@ pub trait Reader { fn read_from_slice(&self, reader: &mut UserSliceReader) -> Result; } -impl Reader for Mutex { +impl Reader for Mutex { fn read_from_slice(&self, reader: &mut UserSliceReader) -> Result { let mut buf = [0u8; 128]; if reader.len() > buf.len() { -- 2.51.0