[PATCH 1/2] fs/proc/task_mmu: change lock_vma_range() to return error code

[Suren Baghdasaryan <surenb@google.com>]

To correctly propagate error code from lock_vma_range(), change it to
return the error code instead of the boolean. This simplifies error
propagation code.

Signed-off-by: Suren Baghdasaryan <surenb@google.com>
---
 fs/proc/task_mmu.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index d32408f7cd5e..023422fcee12 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -162,13 +162,13 @@ static void unlock_ctx_vma(struct proc_maps_locking_ctx *lock_ctx)
 	}
 }
 
-static inline bool lock_vma_range(struct seq_file *m,
-				  struct proc_maps_locking_ctx *lock_ctx)
+static inline int lock_vma_range(struct seq_file *m,
+				 struct proc_maps_locking_ctx *lock_ctx)
 {
 	rcu_read_lock();
 	reset_lock_ctx(lock_ctx);
 
-	return true;
+	return 0;
 }
 
 static inline void unlock_vma_range(struct proc_maps_locking_ctx *lock_ctx)
@@ -245,10 +245,10 @@ static inline void unlock_ctx_mm(struct proc_maps_locking_ctx *lock_ctx)
 	mmap_read_unlock(lock_ctx->mm);
 }
 
-static inline bool lock_vma_range(struct seq_file *m,
+static inline int lock_vma_range(struct seq_file *m,
 				  struct proc_maps_locking_ctx *lock_ctx)
 {
-	return lock_ctx_mm(lock_ctx) == 0;
+	return lock_ctx_mm(lock_ctx);
 }
 
 static inline void unlock_vma_range(struct proc_maps_locking_ctx *lock_ctx)
@@ -311,6 +311,7 @@ static void *m_start(struct seq_file *m, loff_t *ppos)
 	struct proc_maps_locking_ctx *lock_ctx;
 	loff_t last_addr = *ppos;
 	struct mm_struct *mm;
+	int err;
 
 	/* See m_next(). Zero at the start or after lseek. */
 	if (last_addr == SENTINEL_VMA_END)
@@ -328,11 +329,12 @@ static void *m_start(struct seq_file *m, loff_t *ppos)
 		return NULL;
 	}
 
-	if (!lock_vma_range(m, lock_ctx)) {
+	err = lock_vma_range(m, lock_ctx);
+	if (err) {
 		mmput(mm);
 		put_task_struct(priv->task);
 		priv->task = NULL;
-		return ERR_PTR(-EINTR);
+		return ERR_PTR(err);
 	}
 
 	/*

base-commit: e178a530a81621a29efbca49b3b78202a18236e4
-- 
2.54.0.1032.g2f8565e1d1-goog