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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; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV YrOOI5VGLHge0awt7bhMCTM9KAfPc+xL/ZxAMVWd3NCk5SamL2cE99UWgtvNOIYU8m6EjTLhsj8sn VluJH0/RcxEeFbnSaswVChNSGa7mXJrTR22lRL6ZPjdMgS2Km90haWPRc8Wolcz07Y2se0xpGVLEQ cDEsvv5IMmeMe1/qLZ6NaVkNuL3WOXvxaVT9USW1+/SGipO2IpKJjeDZfehlB/kpfF24+RrK+seQf 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Yy9YbXtWctUz8uvDR7shsQxAhX3qO7DilMtuGo1v97I/Kx4gXQ52syh/w6EBny71CZrOgD6kJwPVV AaM1LRC28muq91WCFhs/nzHozpbzcheyGtMUI2Ao4K6mnY+3zIuXPygZMFr9KXE6fF7HzKxKuZMJO aEZCiDOq0anx6FmOzs5E6Jqdpo/mtI8beK+BE7Va6ni7YrQlnT0i3vaTVMTiCThbqsB20VrbMjlhp f8lfK1XVNbRq/R7GZ9zHESlsa35ha60yd/j3pu5hT2xyy8krV8vGhHvnJ1XRMJBAB/UYb6FyC7S+m QZIQXVeAA+smfTT0tDrisj1U5x6ZB9b3nBg65kc= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.2 (3.58.2-1.fc43) Precedence: bulk X-Mailing-List: linux-modules@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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