From: Matthew Wilcox <willy@infradead.org>
To: Michel Lespinasse <walken@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Laurent Dufour <ldufour@linux.ibm.com>,
Vlastimil Babka <vbabka@suse.cz>,
Liam Howlett <Liam.Howlett@oracle.com>,
Jerome Glisse <jglisse@redhat.com>,
Davidlohr Bueso <dave@stgolabs.net>,
David Rientjes <rientjes@google.com>,
Hugh Dickins <hughd@google.com>, Ying Han <yinghan@google.com>,
Jason Gunthorpe <jgg@ziepe.ca>,
Daniel Jordan <daniel.m.jordan@oracle.com>
Subject: Re: [PATCH v5 10/10] mmap locking API: rename mmap_sem to mmap_lock
Date: Tue, 21 Apr 2020 18:58:29 -0700 [thread overview]
Message-ID: <20200422015829.GR5820@bombadil.infradead.org> (raw)
In-Reply-To: <20200422001422.232330-11-walken@google.com>
On Tue, Apr 21, 2020 at 05:14:22PM -0700, Michel Lespinasse wrote:
> Rename the mmap_sem field to mmap_lock. Any new uses of this lock
Shouldn't some of these be folded into the previous patch?
(Quoted below are the ones I think should be mmap_assert_locked())
This does illustrate that we also need an mmap_assert_write_locked(),
and lockdep_assert_held_write() doesn't have a non-lockdep counterpart.
We can at least assert that it's not _unlocked_, even if we can't assert
that it's definitely _write_ locked.
> +++ b/arch/x86/events/core.c
> @@ -2179,10 +2179,10 @@ static void x86_pmu_event_mapped(struct perf_event *event, struct mm_struct *mm)
> * userspace with CR4.PCE clear while another task is still
> * doing on_each_cpu_mask() to propagate CR4.PCE.
> *
> - * For now, this can't happen because all callers hold mmap_sem
> + * For now, this can't happen because all callers hold mmap_lock
> * for write. If this changes, we'll need a different solution.
> */
> - lockdep_assert_held_write(&mm->mmap_sem);
> + lockdep_assert_held_write(&mm->mmap_lock);
>
> if (atomic_inc_return(&mm->context.perf_rdpmc_allowed) == 1)
> on_each_cpu_mask(mm_cpumask(mm), refresh_pce, NULL, 1);
> diff --git a/mm/hmm.c b/mm/hmm.c
> index 280585833adf..8660aec6aafa 100644
> --- a/mm/hmm.c
> +++ b/mm/hmm.c
> @@ -581,7 +581,7 @@ long hmm_range_fault(struct hmm_range *range)
> struct mm_struct *mm = range->notifier->mm;
> int ret;
>
> - lockdep_assert_held(&mm->mmap_sem);
> + lockdep_assert_held(&mm->mmap_lock);
>
> do {
> /* If range is no longer valid force retry. */
> diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
> index cfd0a03bf5cc..6717278d6d49 100644
> --- a/mm/mmu_notifier.c
> +++ b/mm/mmu_notifier.c
> @@ -609,7 +609,7 @@ int __mmu_notifier_register(struct mmu_notifier *subscription,
> struct mmu_notifier_subscriptions *subscriptions = NULL;
> int ret;
>
> - lockdep_assert_held_write(&mm->mmap_sem);
> + lockdep_assert_held_write(&mm->mmap_lock);
> BUG_ON(atomic_read(&mm->mm_users) <= 0);
>
> if (IS_ENABLED(CONFIG_LOCKDEP)) {
> @@ -761,7 +761,7 @@ struct mmu_notifier *mmu_notifier_get_locked(const struct mmu_notifier_ops *ops,
> struct mmu_notifier *subscription;
> int ret;
>
> - lockdep_assert_held_write(&mm->mmap_sem);
> + lockdep_assert_held_write(&mm->mmap_lock);
>
> if (mm->notifier_subscriptions) {
> subscription = find_get_mmu_notifier(mm, ops);
> @@ -1006,7 +1006,7 @@ int mmu_interval_notifier_insert_locked(
> mm->notifier_subscriptions;
> int ret;
>
> - lockdep_assert_held_write(&mm->mmap_sem);
> + lockdep_assert_held_write(&mm->mmap_lock);
>
> if (!subscriptions || !subscriptions->has_itree) {
> ret = __mmu_notifier_register(NULL, mm);
> diff --git a/mm/pagewalk.c b/mm/pagewalk.c
> index 928df1638c30..d669a3146c0f 100644
> --- a/mm/pagewalk.c
> +++ b/mm/pagewalk.c
> @@ -395,7 +396,7 @@ int walk_page_range(struct mm_struct *mm, unsigned long start,
> if (!walk.mm)
> return -EINVAL;
>
> - lockdep_assert_held(&walk.mm->mmap_sem);
> + lockdep_assert_held(&walk.mm->mmap_lock);
>
> vma = find_vma(walk.mm, start);
> do {
> @@ -453,7 +454,7 @@ int walk_page_range_novma(struct mm_struct *mm, unsigned long start,
> if (start >= end || !walk.mm)
> return -EINVAL;
>
> - lockdep_assert_held(&walk.mm->mmap_sem);
> + lockdep_assert_held(&walk.mm->mmap_lock);
>
> return __walk_page_range(start, end, &walk);
> }
> @@ -472,7 +473,7 @@ int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops,
> if (!walk.mm)
> return -EINVAL;
>
> - lockdep_assert_held(&walk.mm->mmap_sem);
> + lockdep_assert_held(&walk.mm->mmap_lock);
>
> err = walk_page_test(vma->vm_start, vma->vm_end, &walk);
> if (err > 0)
> diff --git a/mm/util.c b/mm/util.c
> index ea2e15b21446..56c562f7ad19 100644
> --- a/mm/util.c
> +++ b/mm/util.c
> @@ -437,7 +437,7 @@ int __account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc,
> unsigned long locked_vm, limit;
> int ret = 0;
>
> - lockdep_assert_held_write(&mm->mmap_sem);
> + lockdep_assert_held_write(&mm->mmap_lock);
>
> locked_vm = mm->locked_vm;
> if (inc) {
> --
> 2.26.1.301.g55bc3eb7cb9-goog
>
next prev parent reply other threads:[~2020-04-22 1:58 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-22 0:14 [PATCH v5 00/10] Add a new mmap locking API wrapping mmap_sem calls Michel Lespinasse
2020-04-22 0:14 ` [PATCH v5 01/10] mmap locking API: initial implementation as rwsem wrappers Michel Lespinasse
2020-05-18 9:28 ` Vlastimil Babka
2020-05-18 13:18 ` Laurent Dufour
2020-04-22 0:14 ` [PATCH v5 02/10] MMU notifier: use the new mmap locking API Michel Lespinasse
2020-05-18 9:28 ` Vlastimil Babka
2020-05-18 13:19 ` Laurent Dufour
2020-04-22 0:14 ` [PATCH v5 03/10] DMA reservations: " Michel Lespinasse
2020-05-18 9:30 ` Vlastimil Babka
2020-05-18 13:20 ` Laurent Dufour
2020-04-22 0:14 ` [PATCH v5 04/10] mmap locking API: use coccinelle to convert mmap_sem rwsem call sites Michel Lespinasse
2020-05-18 9:36 ` Vlastimil Babka
2020-05-18 13:21 ` Laurent Dufour
2020-04-22 0:14 ` [PATCH v5 05/10] mmap locking API: convert mmap_sem call sites missed by coccinelle Michel Lespinasse
2020-05-18 9:44 ` Vlastimil Babka
2020-05-18 13:23 ` Laurent Dufour
2020-04-22 0:14 ` [PATCH v5 06/10] mmap locking API: convert nested write lock sites Michel Lespinasse
2020-05-18 10:32 ` Vlastimil Babka
2020-05-19 12:54 ` Michel Lespinasse
2020-05-18 13:24 ` Laurent Dufour
2020-04-22 0:14 ` [PATCH v5 07/10] mmap locking API: add mmap_read_trylock_non_owner() Michel Lespinasse
2020-05-18 10:42 ` Vlastimil Babka
2020-04-22 0:14 ` [PATCH v5 08/10] mmap locking API: add MMAP_LOCK_INITIALIZER Michel Lespinasse
2020-05-18 10:45 ` Vlastimil Babka
2020-05-19 12:56 ` Michel Lespinasse
2020-05-18 13:33 ` Laurent Dufour
2020-04-22 0:14 ` [PATCH v5 09/10] mmap locking API: add mmap_assert_locked Michel Lespinasse
2020-04-22 2:10 ` Michel Lespinasse
2020-04-22 2:18 ` Matthew Wilcox
2020-04-24 1:44 ` Michel Lespinasse
2020-04-22 0:14 ` [PATCH v5 10/10] mmap locking API: rename mmap_sem to mmap_lock Michel Lespinasse
2020-04-22 1:58 ` Matthew Wilcox [this message]
2020-04-22 22:54 ` Michel Lespinasse
2020-04-23 1:59 ` Matthew Wilcox
2020-04-24 1:26 ` Michel Lespinasse
2020-04-24 1:38 ` [PATCH v5.5 09/10] mmap locking API: add mmap_assert_locked() and mmap_assert_write_locked() Michel Lespinasse
2020-05-18 11:01 ` Vlastimil Babka
2020-05-19 13:06 ` Michel Lespinasse
2020-04-24 1:39 ` [PATCH v5.5 10/10] mmap locking API: rename mmap_sem to mmap_lock Michel Lespinasse
2020-05-18 11:07 ` Vlastimil Babka
2020-05-19 13:12 ` Michel Lespinasse
2020-05-18 13:45 ` Laurent Dufour
2020-05-19 13:10 ` Michel Lespinasse
2020-05-19 13:20 ` Laurent Dufour
2020-05-19 15:32 ` Matthew Wilcox
2020-05-19 18:14 ` John Hubbard
2020-05-20 2:39 ` Michel Lespinasse
2020-05-20 7:32 ` John Hubbard
2020-05-20 8:02 ` Michel Lespinasse
2020-05-20 12:48 ` Jason Gunthorpe
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