From: Byungchul Park <byungchul@sk•com>
To: Jeff Layton <jlayton@kernel•org>
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Subject: Re: [PATCH v18 41/42] SUNRPC: relocate struct rcu_head to the first field of struct rpc_xprt
Date: Mon, 15 Dec 2025 14:15:17 +0900 [thread overview]
Message-ID: <20251215051517.GB49936@system.software.com> (raw)
In-Reply-To: <cd65b963dd4edade3afb2e7d27eb33af1c62682e.camel@kernel.org>
On Fri, Dec 05, 2025 at 04:27:52AM -0500, Jeff Layton wrote:
> On Fri, 2025-12-05 at 16:18 +0900, Byungchul Park wrote:
> > While compiling Linux kernel with DEPT on, the following error was
> > observed:
> >
> > ./include/linux/rcupdate.h:1084:17: note: in expansion of macro
> > ‘BUILD_BUG_ON’
> > 1084 | BUILD_BUG_ON(offsetof(typeof(*(ptr)), rhf) >= 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
> >
> > 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.
> >
> > Relocate struct rcu_head to the first field of struct rpc_xprt from an
> > arbitrary location to avoid the issue and meet the assumption.
> >
> > Reported-by: Yunseong Kim <ysk@kzalloc•com>
> > Signed-off-by: Byungchul Park <byungchul@sk•com>
> > ---
> > include/linux/sunrpc/xprt.h | 9 ++++++++-
> > 1 file changed, 8 insertions(+), 1 deletion(-)
> >
> > 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 {
> >
> > 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 <jlayton@kernel•org>
Thank you, Jeff.
Byungchul
next prev parent reply other threads:[~2025-12-15 5:15 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-05 7:18 [PATCH v18 00/42] DEPT(DEPendency Tracker) Byungchul Park
2025-12-05 7:18 ` [PATCH v18 01/42] dept: implement " Byungchul Park
2025-12-05 7:18 ` [PATCH v18 02/42] dept: add single event dependency tracker APIs Byungchul Park
2025-12-05 7:18 ` [PATCH v18 03/42] dept: add lock " Byungchul Park
2025-12-05 7:18 ` [PATCH v18 04/42] dept: tie to lockdep and IRQ tracing Byungchul Park
2025-12-05 7:18 ` [PATCH v18 05/42] dept: add proc knobs to show stats and dependency graph Byungchul Park
2025-12-05 7:18 ` [PATCH v18 06/42] dept: distinguish each kernel context from another Byungchul Park
2025-12-05 7:18 ` [PATCH v18 07/42] dept: distinguish each work " Byungchul Park
2025-12-05 7:18 ` [PATCH v18 08/42] dept: add a mechanism to refill the internal memory pools on running out Byungchul Park
2025-12-05 7:18 ` [PATCH v18 09/42] dept: record the latest one out of consecutive waits of the same class Byungchul Park
2025-12-05 7:18 ` [PATCH v18 10/42] dept: apply sdt_might_sleep_{start,end}() to wait_for_completion()/complete() Byungchul Park
2025-12-05 7:18 ` [PATCH v18 11/42] dept: apply sdt_might_sleep_{start,end}() to swait Byungchul Park
2025-12-05 7:18 ` [PATCH v18 12/42] dept: apply sdt_might_sleep_{start,end}() to waitqueue wait Byungchul Park
2025-12-05 7:18 ` [PATCH v18 13/42] dept: apply sdt_might_sleep_{start,end}() to hashed-waitqueue wait Byungchul Park
2025-12-05 7:18 ` [PATCH v18 14/42] dept: apply sdt_might_sleep_{start,end}() to dma fence Byungchul Park
2025-12-05 7:18 ` [PATCH v18 15/42] dept: track timeout waits separately with a new Kconfig Byungchul Park
2025-12-05 7:18 ` [PATCH v18 16/42] dept: apply timeout consideration to wait_for_completion()/complete() Byungchul Park
2025-12-05 7:18 ` [PATCH v18 17/42] dept: apply timeout consideration to swait Byungchul Park
2025-12-05 7:18 ` [PATCH v18 18/42] dept: apply timeout consideration to waitqueue wait Byungchul Park
2025-12-05 7:18 ` [PATCH v18 19/42] dept: apply timeout consideration to hashed-waitqueue wait Byungchul Park
2025-12-05 7:18 ` [PATCH v18 20/42] dept: apply timeout consideration to dma fence wait Byungchul Park
2025-12-05 7:18 ` [PATCH v18 21/42] dept: make dept able to work with an external wgen Byungchul Park
2025-12-05 7:18 ` [PATCH v18 22/42] dept: track PG_locked with dept Byungchul Park
2025-12-05 7:18 ` [PATCH v18 23/42] dept: print staged wait's stacktrace on report Byungchul Park
2025-12-05 7:18 ` [PATCH v18 24/42] locking/lockdep: prevent various lockdep assertions when lockdep_off()'ed Byungchul Park
2025-12-05 7:18 ` [PATCH v18 25/42] dept: add documents for dept Byungchul Park
2025-12-06 0:25 ` Bagas Sanjaya
2025-12-15 4:22 ` Byungchul Park
2025-12-15 9:06 ` Bagas Sanjaya
2026-04-28 16:26 ` [PATCH] dept: update documentation function names to match implementation Yunseong Kim
2026-05-06 6:27 ` Byungchul Park
2025-12-05 7:18 ` [PATCH v18 26/42] cpu/hotplug: use a weaker annotation in AP thread Byungchul Park
2025-12-05 7:18 ` [PATCH v18 27/42] dept: assign dept map to mmu notifier invalidation synchronization Byungchul Park
2025-12-05 7:18 ` [PATCH v18 28/42] dept: assign unique dept_key to each distinct dma fence caller Byungchul Park
2025-12-05 7:18 ` [PATCH v18 29/42] dept: make dept aware of lockdep_set_lock_cmp_fn() annotation Byungchul Park
2025-12-05 7:18 ` [PATCH v18 30/42] dept: make dept stop from working on debug_locks_off() Byungchul Park
2025-12-05 7:18 ` [PATCH v18 31/42] dept: assign unique dept_key to each distinct wait_for_completion() caller Byungchul Park
2026-02-15 6:42 ` Dirk Behme
2026-02-23 0:32 ` Byungchul Park
2025-12-05 7:18 ` [PATCH v18 32/42] completion, dept: introduce init_completion_dmap() API Byungchul Park
2025-12-05 7:18 ` [PATCH v18 33/42] dept: introduce a new type of dependency tracking between multi event sites Byungchul Park
2025-12-05 7:18 ` [PATCH v18 34/42] dept: add module support for struct dept_event_site and dept_event_site_dep Byungchul Park
2026-01-07 12:19 ` Petr Pavlu
2026-02-13 5:50 ` Byungchul Park
2026-02-18 15:08 ` Petr Pavlu
2026-02-23 0:33 ` Byungchul Park
2025-12-05 7:18 ` [PATCH v18 35/42] dept: introduce event_site() to disable event tracking if it's recoverable Byungchul Park
2025-12-05 7:18 ` [PATCH v18 36/42] dept: implement a basic unit test for dept Byungchul Park
2025-12-05 7:18 ` [PATCH v18 37/42] dept: call dept_hardirqs_off() in local_irq_*() regardless of irq state Byungchul Park
2025-12-05 7:18 ` [PATCH v18 38/42] rcu/update: fix same dept key collision between various types of RCU Byungchul Park
2025-12-05 7:18 ` [PATCH v18 39/42] dept: introduce APIs to set page usage and use subclasses_evt for the usage Byungchul Park
2025-12-05 7:18 ` [PATCH v18 40/42] dept: track PG_writeback with dept Byungchul Park
2025-12-05 7:18 ` [PATCH v18 41/42] SUNRPC: relocate struct rcu_head to the first field of struct rpc_xprt Byungchul Park
2025-12-05 9:27 ` Jeff Layton
2025-12-15 5:15 ` Byungchul Park [this message]
2025-12-05 7:18 ` [PATCH v18 42/42] mm: percpu: increase PERCPU_DYNAMIC_SIZE_SHIFT on DEPT and large PAGE_SIZE Byungchul Park
2026-03-17 4:44 ` [PATCH v18 00/42] DEPT(DEPendency Tracker) Byungchul Park
2026-03-18 5:58 ` Yunseong Kim
2026-05-23 12:32 ` DEPT (the dependency tracker) as AI review prompt? (was: DEPT v18) Harry Yoo
2026-05-23 14:00 ` Yunseong Kim
2026-05-23 14:34 ` DEPT (the dependency tracker) as AI review prompt? Harry Yoo
2026-05-23 15:04 ` Yunseong Kim
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