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Date: Fri, 29 Mar 2019 11:54:32 +0800
From: kbuild test robot <lkp@...el.com>
To: Florian Westphal <fw@...len.de>
Cc: kbuild-all@...org, netdev@...r.kernel.org,
steffen.klassert@...unet.com, Florian Westphal <fw@...len.de>
Subject: Re: [PATCH ipsec-next 10/11] xfrm: make xfrm modes builtin
Hi Florian,
I love your patch! Perhaps something to improve:
[auto build test WARNING on ipsec-next/master]
url: https://github.com/0day-ci/linux/commits/Florian-Westphal/xfrm-remove-xfrm_mode-indirections/20190329-041949
base: https://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next.git master
reproduce:
# apt-get install sparse
make ARCH=x86_64 allmodconfig
make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'
sparse warnings: (new ones prefixed by >>)
net/xfrm/xfrm_state.c:928:9: sparse: cast removes address space of expression
net/xfrm/xfrm_state.c:928:9: sparse: cast removes address space of expression
net/xfrm/xfrm_state.c:928:9: sparse: cast removes address space of expression
net/xfrm/xfrm_state.c:928:9: sparse: cast removes address space of expression
net/xfrm/xfrm_state.c:928:9: sparse: cast removes address space of expression
net/xfrm/xfrm_state.c:945:9: sparse: cast removes address space of expression
net/xfrm/xfrm_state.c:945:9: sparse: cast removes address space of expression
net/xfrm/xfrm_state.c:945:9: sparse: cast removes address space of expression
net/xfrm/xfrm_state.c:945:9: sparse: cast removes address space of expression
net/xfrm/xfrm_state.c:945:9: sparse: cast removes address space of expression
net/xfrm/xfrm_state.c:945:9: sparse: cast removes address space of expression
net/xfrm/xfrm_state.c:945:9: sparse: cast removes address space of expression
net/xfrm/xfrm_state.c:945:9: sparse: cast removes address space of expression
net/xfrm/xfrm_state.c:945:9: sparse: cast removes address space of expression
net/xfrm/xfrm_state.c:945:9: sparse: cast removes address space of expression
net/xfrm/xfrm_state.c:945:9: sparse: cast removes address space of expression
net/xfrm/xfrm_state.c:945:9: sparse: cast removes address space of expression
net/xfrm/xfrm_state.c:945:9: sparse: cast removes address space of expression
net/xfrm/xfrm_state.c:945:9: sparse: cast removes address space of expression
net/xfrm/xfrm_state.c:1003:77: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct hlist_head *h @@ got struct hlist_headstruct hlist_head *h @@
net/xfrm/xfrm_state.c:1003:77: expected struct hlist_head *h
net/xfrm/xfrm_state.c:1003:77: got struct hlist_head [noderef] <asn:4>*
net/xfrm/xfrm_state.c:1005:77: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct hlist_head *h @@ got struct hlist_headstruct hlist_head *h @@
net/xfrm/xfrm_state.c:1005:77: expected struct hlist_head *h
net/xfrm/xfrm_state.c:1005:77: got struct hlist_head [noderef] <asn:4>*
net/xfrm/xfrm_state.c:1008:85: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct hlist_head *h @@ got struct hlist_headstruct hlist_head *h @@
net/xfrm/xfrm_state.c:1008:85: expected struct hlist_head *h
net/xfrm/xfrm_state.c:1008:85: got struct hlist_head [noderef] <asn:4>*
net/xfrm/xfrm_state.c:1024:42: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct xfrm_state [noderef] <asn:4>*x @@ got xfrm_state [noderef] <asn:4>*x @@
net/xfrm/xfrm_state.c:1024:42: expected struct xfrm_state [noderef] <asn:4>*x
net/xfrm/xfrm_state.c:1024:42: got struct xfrm_state *[assigned] x
net/xfrm/xfrm_state.c:52:39: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct refcount_struct [usertype] *r @@ got structstruct refcount_struct [usertype] *r @@
net/xfrm/xfrm_state.c:52:39: expected struct refcount_struct [usertype] *r
net/xfrm/xfrm_state.c:52:39: got struct refcount_struct [noderef] <asn:4>*<noident>
net/xfrm/xfrm_state.c:1111:61: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct hlist_head *h @@ got struct hlist_headstruct hlist_head *h @@
net/xfrm/xfrm_state.c:1111:61: expected struct hlist_head *h
net/xfrm/xfrm_state.c:1111:61: got struct hlist_head [noderef] <asn:4>*
net/xfrm/xfrm_state.c:1114:61: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct hlist_head *h @@ got struct hlist_headstruct hlist_head *h @@
net/xfrm/xfrm_state.c:1114:61: expected struct hlist_head *h
net/xfrm/xfrm_state.c:1114:61: got struct hlist_head [noderef] <asn:4>*
net/xfrm/xfrm_state.c:1120:69: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct hlist_head *h @@ got struct hlist_headstruct hlist_head *h @@
net/xfrm/xfrm_state.c:1120:69: expected struct hlist_head *h
net/xfrm/xfrm_state.c:1120:69: got struct hlist_head [noderef] <asn:4>*
net/xfrm/xfrm_state.c:1232:69: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct hlist_head *h @@ got struct hlist_headstruct hlist_head *h @@
net/xfrm/xfrm_state.c:1232:69: expected struct hlist_head *h
net/xfrm/xfrm_state.c:1232:69: got struct hlist_head [noderef] <asn:4>*
net/xfrm/xfrm_state.c:1234:69: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct hlist_head *h @@ got struct hlist_headstruct hlist_head *h @@
net/xfrm/xfrm_state.c:1234:69: expected struct hlist_head *h
net/xfrm/xfrm_state.c:1234:69: got struct hlist_head [noderef] <asn:4>*
net/xfrm/xfrm_state.c:1789:69: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct hlist_head *h @@ got struct hlist_headstruct hlist_head *h @@
net/xfrm/xfrm_state.c:1789:69: expected struct hlist_head *h
net/xfrm/xfrm_state.c:1789:69: got struct hlist_head [noderef] <asn:4>*
net/xfrm/xfrm_state.c:2314:31: sparse: incorrect type in assignment (different address spaces) @@ expected struct hlist_head [noderef] <asn:4>*state_bydst @@ got [noderef] <asn:4>*state_bydst @@
net/xfrm/xfrm_state.c:2314:31: expected struct hlist_head [noderef] <asn:4>*state_bydst
net/xfrm/xfrm_state.c:2314:31: got struct hlist_head *
net/xfrm/xfrm_state.c:2317:31: sparse: incorrect type in assignment (different address spaces) @@ expected struct hlist_head [noderef] <asn:4>*state_bysrc @@ got [noderef] <asn:4>*state_bysrc @@
net/xfrm/xfrm_state.c:2317:31: expected struct hlist_head [noderef] <asn:4>*state_bysrc
net/xfrm/xfrm_state.c:2317:31: got struct hlist_head *
net/xfrm/xfrm_state.c:2320:31: sparse: incorrect type in assignment (different address spaces) @@ expected struct hlist_head [noderef] <asn:4>*state_byspi @@ got [noderef] <asn:4>*state_byspi @@
net/xfrm/xfrm_state.c:2320:31: expected struct hlist_head [noderef] <asn:4>*state_byspi
net/xfrm/xfrm_state.c:2320:31: got struct hlist_head *
net/xfrm/xfrm_state.c:2331:33: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct hlist_head *n @@ got struct hlist_headstruct hlist_head *n @@
net/xfrm/xfrm_state.c:2331:33: expected struct hlist_head *n
net/xfrm/xfrm_state.c:2331:33: got struct hlist_head [noderef] <asn:4>*state_bysrc
net/xfrm/xfrm_state.c:2333:33: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct hlist_head *n @@ got struct hlist_headstruct hlist_head *n @@
net/xfrm/xfrm_state.c:2333:33: expected struct hlist_head *n
net/xfrm/xfrm_state.c:2333:33: got struct hlist_head [noderef] <asn:4>*state_bydst
net/xfrm/xfrm_state.c:2349:9: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct hlist_head const *h @@ got struct hlisstruct hlist_head const *h @@
net/xfrm/xfrm_state.c:2349:9: expected struct hlist_head const *h
net/xfrm/xfrm_state.c:2349:9: got struct hlist_head [noderef] <asn:4>*state_byspi
net/xfrm/xfrm_state.c:2350:33: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct hlist_head *n @@ got struct hlist_headstruct hlist_head *n @@
net/xfrm/xfrm_state.c:2350:33: expected struct hlist_head *n
net/xfrm/xfrm_state.c:2350:33: got struct hlist_head [noderef] <asn:4>*state_byspi
net/xfrm/xfrm_state.c:2351:9: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct hlist_head const *h @@ got struct hlisstruct hlist_head const *h @@
net/xfrm/xfrm_state.c:2351:9: expected struct hlist_head const *h
net/xfrm/xfrm_state.c:2351:9: got struct hlist_head [noderef] <asn:4>*state_bysrc
net/xfrm/xfrm_state.c:2352:33: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct hlist_head *n @@ got struct hlist_headstruct hlist_head *n @@
net/xfrm/xfrm_state.c:2352:33: expected struct hlist_head *n
net/xfrm/xfrm_state.c:2352:33: got struct hlist_head [noderef] <asn:4>*state_bysrc
net/xfrm/xfrm_state.c:2353:9: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct hlist_head const *h @@ got struct hlisstruct hlist_head const *h @@
net/xfrm/xfrm_state.c:2353:9: expected struct hlist_head const *h
net/xfrm/xfrm_state.c:2353:9: got struct hlist_head [noderef] <asn:4>*state_bydst
net/xfrm/xfrm_state.c:2354:33: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct hlist_head *n @@ got struct hlist_headstruct hlist_head *n @@
net/xfrm/xfrm_state.c:2354:33: expected struct hlist_head *n
net/xfrm/xfrm_state.c:2354:33: got struct hlist_head [noderef] <asn:4>*state_bydst
include/linux/rcupdate.h:647:9: sparse: context imbalance in 'xfrm_register_type' - unexpected unlock
include/linux/rcupdate.h:647:9: sparse: context imbalance in 'xfrm_unregister_type' - unexpected unlock
include/linux/rcupdate.h:647:9: sparse: context imbalance in 'xfrm_get_type' - unexpected unlock
include/linux/rcupdate.h:647:9: sparse: context imbalance in 'xfrm_register_type_offload' - unexpected unlock
include/linux/rcupdate.h:647:9: sparse: context imbalance in 'xfrm_unregister_type_offload' - unexpected unlock
include/linux/rcupdate.h:647:9: sparse: context imbalance in 'xfrm_get_type_offload' - unexpected unlock
net/xfrm/xfrm_state.c:629:17: sparse: dereference of noderef expression
net/xfrm/xfrm_state.c:690:17: sparse: dereference of noderef expression
net/xfrm/xfrm_state.c:650:17: sparse: dereference of noderef expression
net/xfrm/xfrm_state.c:734:17: sparse: dereference of noderef expression
net/xfrm/xfrm_state.c:1056:9: sparse: dereference of noderef expression
net/xfrm/xfrm_state.c:1144:9: sparse: dereference of noderef expression
net/xfrm/xfrm_state.c:1179:9: sparse: dereference of noderef expression
net/xfrm/xfrm_state.c:1407:17: sparse: dereference of noderef expression
net/xfrm/xfrm_state.c:1424:17: sparse: dereference of noderef expression
>> include/linux/rcupdate.h:647:9: sparse: context imbalance in 'xfrm_tmpl_sort' - unexpected unlock
>> include/linux/rcupdate.h:647:9: sparse: context imbalance in 'xfrm_state_sort' - unexpected unlock
net/xfrm/xfrm_state.c:1687:17: sparse: too many warnings
vim +/xfrm_tmpl_sort +647 include/linux/rcupdate.h
^1da177e4 Linus Torvalds 2005-04-16 599
^1da177e4 Linus Torvalds 2005-04-16 600 /*
^1da177e4 Linus Torvalds 2005-04-16 601 * So where is rcu_write_lock()? It does not exist, as there is no
^1da177e4 Linus Torvalds 2005-04-16 602 * way for writers to lock out RCU readers. This is a feature, not
^1da177e4 Linus Torvalds 2005-04-16 603 * a bug -- this property is what provides RCU's performance benefits.
^1da177e4 Linus Torvalds 2005-04-16 604 * Of course, writers must coordinate with each other. The normal
^1da177e4 Linus Torvalds 2005-04-16 605 * spinlock primitives work well for this, but any other technique may be
^1da177e4 Linus Torvalds 2005-04-16 606 * used as well. RCU does not care how the writers keep out of each
^1da177e4 Linus Torvalds 2005-04-16 607 * others' way, as long as they do so.
^1da177e4 Linus Torvalds 2005-04-16 608 */
3d76c0829 Paul E. McKenney 2009-09-28 609
3d76c0829 Paul E. McKenney 2009-09-28 610 /**
ca5ecddfa Paul E. McKenney 2010-04-28 611 * rcu_read_unlock() - marks the end of an RCU read-side critical section.
3d76c0829 Paul E. McKenney 2009-09-28 612 *
f27bc4873 Paul E. McKenney 2014-05-04 613 * In most situations, rcu_read_unlock() is immune from deadlock.
f27bc4873 Paul E. McKenney 2014-05-04 614 * However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()
f27bc4873 Paul E. McKenney 2014-05-04 615 * is responsible for deboosting, which it does via rt_mutex_unlock().
f27bc4873 Paul E. McKenney 2014-05-04 616 * Unfortunately, this function acquires the scheduler's runqueue and
f27bc4873 Paul E. McKenney 2014-05-04 617 * priority-inheritance spinlocks. This means that deadlock could result
f27bc4873 Paul E. McKenney 2014-05-04 618 * if the caller of rcu_read_unlock() already holds one of these locks or
ec84b27f9 Anna-Maria Gleixner 2018-05-25 619 * any lock that is ever acquired while holding them.
f27bc4873 Paul E. McKenney 2014-05-04 620 *
f27bc4873 Paul E. McKenney 2014-05-04 621 * That said, RCU readers are never priority boosted unless they were
f27bc4873 Paul E. McKenney 2014-05-04 622 * preempted. Therefore, one way to avoid deadlock is to make sure
f27bc4873 Paul E. McKenney 2014-05-04 623 * that preemption never happens within any RCU read-side critical
f27bc4873 Paul E. McKenney 2014-05-04 624 * section whose outermost rcu_read_unlock() is called with one of
f27bc4873 Paul E. McKenney 2014-05-04 625 * rt_mutex_unlock()'s locks held. Such preemption can be avoided in
f27bc4873 Paul E. McKenney 2014-05-04 626 * a number of ways, for example, by invoking preempt_disable() before
f27bc4873 Paul E. McKenney 2014-05-04 627 * critical section's outermost rcu_read_lock().
f27bc4873 Paul E. McKenney 2014-05-04 628 *
f27bc4873 Paul E. McKenney 2014-05-04 629 * Given that the set of locks acquired by rt_mutex_unlock() might change
f27bc4873 Paul E. McKenney 2014-05-04 630 * at any time, a somewhat more future-proofed approach is to make sure
f27bc4873 Paul E. McKenney 2014-05-04 631 * that that preemption never happens within any RCU read-side critical
f27bc4873 Paul E. McKenney 2014-05-04 632 * section whose outermost rcu_read_unlock() is called with irqs disabled.
f27bc4873 Paul E. McKenney 2014-05-04 633 * This approach relies on the fact that rt_mutex_unlock() currently only
f27bc4873 Paul E. McKenney 2014-05-04 634 * acquires irq-disabled locks.
f27bc4873 Paul E. McKenney 2014-05-04 635 *
f27bc4873 Paul E. McKenney 2014-05-04 636 * The second of these two approaches is best in most situations,
f27bc4873 Paul E. McKenney 2014-05-04 637 * however, the first approach can also be useful, at least to those
f27bc4873 Paul E. McKenney 2014-05-04 638 * developers willing to keep abreast of the set of locks acquired by
f27bc4873 Paul E. McKenney 2014-05-04 639 * rt_mutex_unlock().
f27bc4873 Paul E. McKenney 2014-05-04 640 *
3d76c0829 Paul E. McKenney 2009-09-28 641 * See rcu_read_lock() for more information.
3d76c0829 Paul E. McKenney 2009-09-28 642 */
bc33f24bd Paul E. McKenney 2009-08-22 643 static inline void rcu_read_unlock(void)
bc33f24bd Paul E. McKenney 2009-08-22 644 {
f78f5b90c Paul E. McKenney 2015-06-18 645 RCU_LOCKDEP_WARN(!rcu_is_watching(),
bde23c689 Heiko Carstens 2012-02-01 646 "rcu_read_unlock() used illegally while idle");
bc33f24bd Paul E. McKenney 2009-08-22 @647 __release(RCU);
bc33f24bd Paul E. McKenney 2009-08-22 648 __rcu_read_unlock();
d24209bb6 Paul E. McKenney 2015-01-21 649 rcu_lock_release(&rcu_lock_map); /* Keep acq info for rls diags. */
bc33f24bd Paul E. McKenney 2009-08-22 650 }
^1da177e4 Linus Torvalds 2005-04-16 651
:::::: The code at line 647 was first introduced by commit
:::::: bc33f24bdca8b6e97376e3a182ab69e6cdefa989 rcu: Consolidate sparse and lockdep declarations in include/linux/rcupdate.h
:::::: TO: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
:::::: CC: Ingo Molnar <mingo@...e.hu>
---
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