From fd6441bf26dd614b3e814278771bc0d9268cffab Mon Sep 17 00:00:00 2001 Message-Id: In-Reply-To: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org> References: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org> From: Sebastian Andrzej Siewior Date: Mon, 16 Feb 2015 18:49:10 +0100 Subject: [PATCH 096/333] fs/aio: simple simple work Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.148-rt64.tar.xz |BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:768 |in_atomic(): 1, irqs_disabled(): 0, pid: 26, name: rcuos/2 |2 locks held by rcuos/2/26: | #0: (rcu_callback){.+.+..}, at: [] rcu_nocb_kthread+0x1e2/0x380 | #1: (rcu_read_lock_sched){.+.+..}, at: [] percpu_ref_kill_rcu+0xa6/0x1c0 |Preemption disabled at:[] rcu_nocb_kthread+0x263/0x380 |Call Trace: | [] dump_stack+0x4e/0x9c | [] __might_sleep+0xfb/0x170 | [] rt_spin_lock+0x24/0x70 | [] free_ioctx_users+0x30/0x130 | [] percpu_ref_kill_rcu+0x1b4/0x1c0 | [] rcu_nocb_kthread+0x263/0x380 | [] kthread+0xd6/0xf0 | [] ret_from_fork+0x7c/0xb0 replace this preempt_disable() friendly swork. Reported-By: Mike Galbraith Suggested-by: Benjamin LaHaise Signed-off-by: Sebastian Andrzej Siewior --- fs/aio.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/fs/aio.c b/fs/aio.c index 413ec289bfa1..ac3430d5b0da 100644 --- a/fs/aio.c +++ b/fs/aio.c @@ -42,6 +42,7 @@ #include #include #include +#include #include #include @@ -121,6 +122,7 @@ struct kioctx { long nr_pages; struct rcu_work free_rwork; /* see free_ioctx() */ + struct swork_event free_swork; /* see free_ioctx() */ /* * signals when all in-flight requests are done @@ -266,6 +268,7 @@ static int __init aio_setup(void) .mount = aio_mount, .kill_sb = kill_anon_super, }; + BUG_ON(swork_get()); aio_mnt = kern_mount(&aio_fs); if (IS_ERR(aio_mnt)) panic("Failed to create aio fs mount."); @@ -607,9 +610,9 @@ static void free_ioctx_reqs(struct percpu_ref *ref) * and ctx->users has dropped to 0, so we know no more kiocbs can be submitted - * now it's safe to cancel any that need to be. */ -static void free_ioctx_users(struct percpu_ref *ref) +static void free_ioctx_users_work(struct swork_event *sev) { - struct kioctx *ctx = container_of(ref, struct kioctx, users); + struct kioctx *ctx = container_of(sev, struct kioctx, free_swork); struct aio_kiocb *req; spin_lock_irq(&ctx->ctx_lock); @@ -627,6 +630,14 @@ static void free_ioctx_users(struct percpu_ref *ref) percpu_ref_put(&ctx->reqs); } +static void free_ioctx_users(struct percpu_ref *ref) +{ + struct kioctx *ctx = container_of(ref, struct kioctx, users); + + INIT_SWORK(&ctx->free_swork, free_ioctx_users_work); + swork_queue(&ctx->free_swork); +} + static int ioctx_add_table(struct kioctx *ctx, struct mm_struct *mm) { unsigned i, new_nr; -- 2.17.1