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[100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 1264E44290; Fri, 5 Dec 2025 09:28:06 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E3F54C4CEF1; Fri, 5 Dec 2025 09:27:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1764926885; bh=/3K8i488KBtohoPjUWcmwxOuPxkVYp8UF2/iPAPxq7Y=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=YRrD1IbijzZtM+qkYdKqMCtJSY7HW/b2RS+RGwoFe9bPK/qWFg3n6jePfSjkEJ252 CAstxESV1t5hIfHaNpivukj3cMXOpAMg0/UqoCgsIZzotoaILL21oKFa9ikkMb7YNl qqNVditrpYtGa7rGlqrjiS8gpKMFlw9u1U78kVXNQ6fZ18DGyDH2qOcSrxYOJtk1WN dF0rZn265IWR71TmnUtnGq8SAs1Q/6QTETPixkqjPtVt06ZheKAgeGXqIyF47v2gee 2OnhEW5m8+31fx4RYUVZM3XYN7ukMj5estutAcl9/Ron0WYtClPzGLKIvzh03vv/vR FOpwVUcjkVvvA== Message-ID: Subject: Re: [PATCH v18 41/42] SUNRPC: relocate struct rcu_head to the first field of struct rpc_xprt From: Jeff Layton To: Byungchul Park , linux-kernel@vger.kernel.org Cc: kernel_team@skhynix.com, 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wangfushuai@baidu.com, linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, linux-i2c@vger.kernel.org, linux-arch@vger.kernel.org, linux-modules@vger.kernel.org, rcu@vger.kernel.org, linux-nfs@vger.kernel.org, linux-rt-devel@lists.linux.dev, 2407018371@qq.com, dakr@kernel.org, miguel.ojeda.sandonis@gmail.com, neilb@ownmail.net, bagasdotme@gmail.com, wsa+renesas@sang-engineering.com, dave.hansen@intel.com, geert@linux-m68k.org, ojeda@kernel.org, alex.gaynor@gmail.com, gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org, a.hindborg@kernel.org, aliceryhl@google.com, tmgross@umich.edu, rust-for-linux@vger.kernel.org Date: Fri, 05 Dec 2025 04:27:52 -0500 In-Reply-To: <20251205071855.72743-42-byungchul@sk.com> References: <20251205071855.72743-1-byungchul@sk.com> <20251205071855.72743-42-byungchul@sk.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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 WQ7+S8Ko BT4M7ezxXW9DMFcODOcF72RtPRNvAMbXU3k8silJSB9kl0a5dieDKgAGfCQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, 2025-12-05 at 16:18 +0900, Byungchul Park wrote: > While compiling Linux kernel with DEPT on, the following error was > observed: >=20 > ./include/linux/rcupdate.h:1084:17: note: in expansion of macro > =E2=80=98BUILD_BUG_ON=E2=80=99 > 1084 | BUILD_BUG_ON(offsetof(typeof(*(ptr)), rhf) >=3D 4096); \ > | ^~~~~~~~~~~~ > ./include/linux/rcupdate.h:1047:29: note: in expansion of macro > 'kvfree_rcu_arg_2' > 1047 | #define kfree_rcu(ptr, rhf) kvfree_rcu_arg_2(ptr, rhf) > | ^~~~~~~~~~~~~~~~ > net/sunrpc/xprt.c:1856:9: note: in expansion of macro 'kfree_rcu' > 1856 | kfree_rcu(xprt, rcu); > | ^~~~~~~~~ > CC net/kcm/kcmproc.o > make[4]: *** [scripts/Makefile.build:203: net/sunrpc/xprt.o] Error 1 >=20 > Since kfree_rcu() assumes 'offset of struct rcu_head in a rcu-managed > struct < 4096', the offest of struct rcu_head in struct rpc_xprt should > not exceed 4096 but does, due to the debug information added by DEPT. >=20 > Relocate struct rcu_head to the first field of struct rpc_xprt from an > arbitrary location to avoid the issue and meet the assumption. >=20 > Reported-by: Yunseong Kim > Signed-off-by: Byungchul Park > --- > include/linux/sunrpc/xprt.h | 9 ++++++++- > 1 file changed, 8 insertions(+), 1 deletion(-) >=20 > diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h > index f46d1fb8f71a..666e42a17a31 100644 > --- a/include/linux/sunrpc/xprt.h > +++ b/include/linux/sunrpc/xprt.h > @@ -211,6 +211,14 @@ enum xprt_transports { > =20 > struct rpc_sysfs_xprt; > struct rpc_xprt { > + /* > + * Place struct rcu_head within the first 4096 bytes of struct > + * rpc_xprt if sizeof(struct rpc_xprt) > 4096, so that > + * kfree_rcu() can simply work assuming that. See the comment > + * in kfree_rcu(). > + */ > + struct rcu_head rcu; > + > struct kref kref; /* Reference count */ > const struct rpc_xprt_ops *ops; /* transport methods */ > unsigned int id; /* transport id */ > @@ -317,7 +325,6 @@ struct rpc_xprt { > #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) > struct dentry *debugfs; /* debugfs directory */ > #endif > - struct rcu_head rcu; > const struct xprt_class *xprt_class; > struct rpc_sysfs_xprt *xprt_sysfs; > bool main; /*mark if this is the 1st transport */ Seems fine to me. Reviewed-by: Jeff Layton