[PATCH 3/4] mm: use mmget_not_zero() helper
From: Vegard Nossum <hidden>
Date: 2016-12-18 12:34:16
Also in:
lkml
Subsystem:
drm drivers, filesystems (vfs and infrastructure), intel drm i915 driver (meteor lake, dg2 and older excluding poulsbo, moorestown and derivative), iommu subsystem, memory management, memory management - swap, memory mapping, performance events subsystem, proc filesystem, the rest, uprobes · Maintainers:
David Airlie, Simona Vetter, Alexander Viro, Christian Brauner, Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, Tvrtko Ursulin, Joerg Roedel, Will Deacon, Andrew Morton, Chris Li, Kairui Song, Liam R. Howlett, Lorenzo Stoakes, Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo, Namhyung Kim, Linus Torvalds, Masami Hiramatsu, Oleg Nesterov
We already have the helper, we can convert the rest of the kernel mechanically using: git grep -l 'atomic_inc_not_zero.*mm_users' | xargs sed -i 's/atomic_inc_not_zero(&\(.*\)->mm_users)/mmget_not_zero\(\1\)/' This is needed for a later patch that hooks into the helper, but might be a worthwhile cleanup on its own. Cc: Andrew Morton <akpm@linux-foundation.org> Acked-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Vegard Nossum <redacted> --- drivers/gpu/drm/i915/i915_gem_userptr.c | 2 +- drivers/iommu/intel-svm.c | 2 +- fs/proc/base.c | 4 ++-- fs/proc/task_mmu.c | 4 ++-- fs/proc/task_nommu.c | 2 +- kernel/events/uprobes.c | 2 +- mm/swapfile.c | 2 +- 7 files changed, 9 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c
index 1f27529cb48e..89be48ed7c77 100644
--- a/drivers/gpu/drm/i915/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/i915_gem_userptr.c@@ -507,7 +507,7 @@ __i915_gem_userptr_get_pages_worker(struct work_struct *_work) flags |= FOLL_WRITE; ret = -EFAULT; - if (atomic_inc_not_zero(&mm->mm_users)) { + if (mmget_not_zero(mm)) { down_read(&mm->mmap_sem); while (pinned < npages) { ret = get_user_pages_remote
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index cb72e0011310..51f2b228723f 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c@@ -579,7 +579,7 @@ static irqreturn_t prq_event_thread(int irq, void *d) if (!svm->mm) goto bad_req; /* If the mm is already defunct, don't handle faults. */ - if (!atomic_inc_not_zero(&svm->mm->mm_users)) + if (!mmget_not_zero(svm->mm)) goto bad_req; down_read(&svm->mm->mmap_sem); vma = find_extend_vma(svm->mm, address);
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 32f04999d930..ec7304f5117a 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c@@ -845,7 +845,7 @@ static ssize_t mem_rw(struct file *file, char __user *buf, return -ENOMEM; copied = 0; - if (!atomic_inc_not_zero(&mm->mm_users)) + if (!mmget_not_zero(mm)) goto free; /* Maybe we should limit FOLL_FORCE to actual ptrace users? */
@@ -953,7 +953,7 @@ static ssize_t environ_read(struct file *file, char __user *buf, return -ENOMEM; ret = 0; - if (!atomic_inc_not_zero(&mm->mm_users)) + if (!mmget_not_zero(mm)) goto free; down_read(&mm->mmap_sem);
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 958f32545064..6c07c7813b26 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c@@ -167,7 +167,7 @@ static void *m_start(struct seq_file *m, loff_t *ppos) return ERR_PTR(-ESRCH); mm = priv->mm; - if (!mm || !atomic_inc_not_zero(&mm->mm_users)) + if (!mm || !mmget_not_zero(mm)) return NULL; down_read(&mm->mmap_sem);
@@ -1352,7 +1352,7 @@ static ssize_t pagemap_read(struct file *file, char __user *buf, unsigned long end_vaddr; int ret = 0, copied = 0; - if (!mm || !atomic_inc_not_zero(&mm->mm_users)) + if (!mm || !mmget_not_zero(mm)) goto out; ret = -EINVAL;
diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c
index 37175621e890..1ef97cfcf422 100644
--- a/fs/proc/task_nommu.c
+++ b/fs/proc/task_nommu.c@@ -219,7 +219,7 @@ static void *m_start(struct seq_file *m, loff_t *pos) return ERR_PTR(-ESRCH); mm = priv->mm; - if (!mm || !atomic_inc_not_zero(&mm->mm_users)) + if (!mm || !mmget_not_zero(mm)) return NULL; down_read(&mm->mmap_sem);
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 215871bda3a2..f164fe8ca5ff 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c@@ -741,7 +741,7 @@ build_map_info(struct address_space *mapping, loff_t offset, bool is_register) continue; } - if (!atomic_inc_not_zero(&vma->vm_mm->mm_users)) + if (!mmget_not_zero(vma->vm_mm)) continue; info = prev;
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 914c31cc143c..5502feef0a4a 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c@@ -1493,7 +1493,7 @@ int try_to_unuse(unsigned int type, bool frontswap, while (swap_count(*swap_map) && !retval && (p = p->next) != &start_mm->mmlist) { mm = list_entry(p, struct mm_struct, mmlist); - if (!atomic_inc_not_zero(&mm->mm_users)) + if (!mmget_not_zero(mm)) continue; spin_unlock(&mmlist_lock); mmput(prev_mm);
--
2.11.0.1.gaa10c3f
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