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x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=microsoft.com header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934150AbeCSVwC (ORCPT ); Mon, 19 Mar 2018 17:52:02 -0400 Received: from mail-cys01nam02on0133.outbound.protection.outlook.com ([104.47.37.133]:20864 "EHLO NAM02-CY1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S934735AbeCSP5x (ORCPT ); Mon, 19 Mar 2018 11:57:53 -0400 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Julia Cartwright , Shaohua Li , Sasha Levin Subject: [PATCH AUTOSEL for 4.9 003/281] md/raid5: make use of spin_lock_irq over local_irq_disable + spin_lock Thread-Topic: [PATCH AUTOSEL for 4.9 003/281] md/raid5: make use of spin_lock_irq over local_irq_disable + spin_lock Thread-Index: AQHTv5sIwF6EWhsavEasuXAX7E4PJA== Date: Mon, 19 Mar 2018 15:57:51 +0000 Message-ID: <20180319155742.13731-3-alexander.levin@microsoft.com> References: <20180319155742.13731-1-alexander.levin@microsoft.com> In-Reply-To: <20180319155742.13731-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB1096;7:xxOteRG6kTL/jNm51d0w4EYBMeJp6a1MFz91KjQUp2/Z45og/Qo9xy3qGu5u2ZEJSM9Z0AV76Rk632dXluPX2IRxnN5tg2PJApSTB3EpC49p5LLr+OwPeySU7fKCvGUBs+maCOhl7r+b9oCPEGCob5HZfuKo+FCsAOe+B9N5lVm68tpZ2VhB21ZPyiJdcCZtoERyLP40R5PdwvjxEwtoFritoUYTZLJ/DYVRZYaCBLRoBCnM4aTPqCV8kX/ZU4UZ;20:XpGmOKQwEe4gNtHeTqxfO9umfS1hribA5zyNY6dBuZWCoDnK9n8Awwfg8IkfmWjJzdQFzKZC3RCX8K1K0EdzHC+IEbQGJBU2e8FU2CFVZ5tnSbNOes1h9hK2pnEZ1BAVjA+MJmG/0955LSt4B3+pvyCXvv9GvAHhgg+5GuGu0LY= x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: a6857327-305b-45f1-d301-08d58db22b67 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB1096; 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On PREEMPT_RT builds, this fixes the following warning, seen by Alexander GQ Gerasiov, due to the sleeping nature of spinlocks. BUG: sleeping function called from invalid context at kernel/locking/rtm= utex.c:993 in_atomic(): 0, irqs_disabled(): 1, pid: 58, name: kworker/u12:1 CPU: 5 PID: 58 Comm: kworker/u12:1 Tainted: G W 4.9.20-rt16= -stand6-686 #1 Hardware name: Supermicro SYS-5027R-WRF/X9SRW-F, BIOS 3.2a 10/28/2015 Workqueue: writeback wb_workfn (flush-253:0) Call Trace: dump_stack+0x47/0x68 ? migrate_enable+0x4a/0xf0 ___might_sleep+0x101/0x180 rt_spin_lock+0x17/0x40 add_stripe_bio+0x4e3/0x6c0 [raid456] ? preempt_count_add+0x42/0xb0 raid5_make_request+0x737/0xdd0 [raid456] Reported-by: Alexander GQ Gerasiov Tested-by: Alexander GQ Gerasiov Signed-off-by: Julia Cartwright Signed-off-by: Shaohua Li Signed-off-by: Sasha Levin --- drivers/md/raid5.c | 17 +++++++---------- 1 file changed, 7 insertions(+), 10 deletions(-) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 475a7a1bcfe0..d4f82854207b 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -110,8 +110,7 @@ static inline void unlock_device_hash_lock(struct r5con= f *conf, int hash) static inline void lock_all_device_hash_locks_irq(struct r5conf *conf) { int i; - local_irq_disable(); - spin_lock(conf->hash_locks); + spin_lock_irq(conf->hash_locks); for (i =3D 1; i < NR_STRIPE_HASH_LOCKS; i++) spin_lock_nest_lock(conf->hash_locks + i, conf->hash_locks); spin_lock(&conf->device_lock); @@ -121,9 +120,9 @@ static inline void unlock_all_device_hash_locks_irq(str= uct r5conf *conf) { int i; spin_unlock(&conf->device_lock); - for (i =3D NR_STRIPE_HASH_LOCKS; i; i--) - spin_unlock(conf->hash_locks + i - 1); - local_irq_enable(); + for (i =3D NR_STRIPE_HASH_LOCKS - 1; i; i--) + spin_unlock(conf->hash_locks + i); + spin_unlock_irq(conf->hash_locks); } =20 /* bio's attached to a stripe+device for I/O are linked together in bi_sec= tor @@ -732,12 +731,11 @@ static bool is_full_stripe_write(struct stripe_head *= sh) =20 static void lock_two_stripes(struct stripe_head *sh1, struct stripe_head *= sh2) { - local_irq_disable(); if (sh1 > sh2) { - spin_lock(&sh2->stripe_lock); + spin_lock_irq(&sh2->stripe_lock); spin_lock_nested(&sh1->stripe_lock, 1); } else { - spin_lock(&sh1->stripe_lock); + spin_lock_irq(&sh1->stripe_lock); spin_lock_nested(&sh2->stripe_lock, 1); } } @@ -745,8 +743,7 @@ static void lock_two_stripes(struct stripe_head *sh1, s= truct stripe_head *sh2) static void unlock_two_stripes(struct stripe_head *sh1, struct stripe_head= *sh2) { spin_unlock(&sh1->stripe_lock); - spin_unlock(&sh2->stripe_lock); - local_irq_enable(); + spin_unlock_irq(&sh2->stripe_lock); } =20 /* Only freshly new full stripe normal write stripe can be added to a batc= h list */ --=20 2.14.1