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Subject[PATCH 3/3] eventfd: fold eventfd_ctx_get() into eventfd_ctx_fileget()
Date
From: Eric Biggers <ebiggers@google.com>

eventfd_ctx_get() is not used outside of eventfd.c, so unexport it and
fold it into eventfd_ctx_fileget().

(eventfd_ctx_get() was apparently added years ago for KVM irqfd's, but
was never used.)

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
fs/eventfd.c | 21 ++++++---------------
include/linux/eventfd.h | 2 +-
2 files changed, 7 insertions(+), 16 deletions(-)

diff --git a/fs/eventfd.c b/fs/eventfd.c
index 6138d2b5cdeb..bc0105ae253f 100644
--- a/fs/eventfd.c
+++ b/fs/eventfd.c
@@ -79,25 +79,12 @@ static void eventfd_free(struct kref *kref)
eventfd_free_ctx(ctx);
}

-/**
- * eventfd_ctx_get - Acquires a reference to the internal eventfd context.
- * @ctx: [in] Pointer to the eventfd context.
- *
- * Returns: In case of success, returns a pointer to the eventfd context.
- */
-struct eventfd_ctx *eventfd_ctx_get(struct eventfd_ctx *ctx)
-{
- kref_get(&ctx->kref);
- return ctx;
-}
-EXPORT_SYMBOL_GPL(eventfd_ctx_get);
-
/**
* eventfd_ctx_put - Releases a reference to the internal eventfd context.
* @ctx: [in] Pointer to eventfd context.
*
* The eventfd context reference must have been previously acquired either
- * with eventfd_ctx_get() or eventfd_ctx_fdget().
+ * with eventfd_ctx_fdget() or eventfd_ctx_fileget().
*/
void eventfd_ctx_put(struct eventfd_ctx *ctx)
{
@@ -382,10 +369,14 @@ EXPORT_SYMBOL_GPL(eventfd_ctx_fdget);
*/
struct eventfd_ctx *eventfd_ctx_fileget(struct file *file)
{
+ struct eventfd_ctx *ctx;
+
if (file->f_op != &eventfd_fops)
return ERR_PTR(-EINVAL);

- return eventfd_ctx_get(file->private_data);
+ ctx = file->private_data;
+ kref_get(&ctx->kref);
+ return ctx;
}
EXPORT_SYMBOL_GPL(eventfd_ctx_fileget);

diff --git a/include/linux/eventfd.h b/include/linux/eventfd.h
index 566fef14d0a6..7094718b653b 100644
--- a/include/linux/eventfd.h
+++ b/include/linux/eventfd.h
@@ -26,11 +26,11 @@
#define EFD_SHARED_FCNTL_FLAGS (O_CLOEXEC | O_NONBLOCK)
#define EFD_FLAGS_SET (EFD_SHARED_FCNTL_FLAGS | EFD_SEMAPHORE)

+struct eventfd_ctx;
struct file;

#ifdef CONFIG_EVENTFD

-struct eventfd_ctx *eventfd_ctx_get(struct eventfd_ctx *ctx);
void eventfd_ctx_put(struct eventfd_ctx *ctx);
struct file *eventfd_fget(int fd);
struct eventfd_ctx *eventfd_ctx_fdget(int fd);
--
2.15.1
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