[PATCH] percpu_ref: Fix comment regarding percpu_ref_init flags

[PATCH] percpu_ref: Fix comment regarding percpu_ref_init flags

[ira.weiny]

From: Ira Weiny <ira.weiny@intel.com>

The comment for percpu_ref_init() implies that using
PERCPU_REF_ALLOW_REINIT will cause the refcount to start at 0.  But
this is not true.  PERCPU_REF_ALLOW_REINIT starts the count at 1 as
if the flags were zero.  Add this fact to the kernel doc comment.

Signed-off-by: Ira Weiny <ira.weiny@intel.com>
---
 lib/percpu-refcount.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/percpu-refcount.c b/lib/percpu-refcount.c
index 4f6c6ebbbbde..48d7fcff70b6 100644
--- a/lib/percpu-refcount.c
+++ b/lib/percpu-refcount.c
@@ -50,9 +50,9 @@ static unsigned long __percpu *percpu_count_ptr(struct percpu_ref *ref)
  * @flags: PERCPU_REF_INIT_* flags
  * @gfp: allocation mask to use
  *
- * Initializes @ref.  If @flags is zero, @ref starts in percpu mode with a
- * refcount of 1; analagous to atomic_long_set(ref, 1).  See the
- * definitions of PERCPU_REF_INIT_* flags for flag behaviors.
+ * Initializes @ref.  If @flags is zero or PERCPU_REF_ALLOW_REINIT, @ref starts
+ * in percpu mode with a refcount of 1; analagous to atomic_long_set(ref, 1).
+ * See the definitions of PERCPU_REF_INIT_* flags for flag behaviors.
  *
  * Note that @release must not sleep - it may potentially be called from RCU
  * callback context by percpu_ref_kill().
-- 
2.21.0

Re: [PATCH] percpu_ref: Fix comment regarding percpu_ref_init flags

[Ira Weiny]

On Mon, Dec 09, 2019 at 01:54:20PM -0800, 'Ira Weiny' wrote:
> From: Ira Weiny <ira.weiny@intel.com>
> 
> The comment for percpu_ref_init() implies that using
> PERCPU_REF_ALLOW_REINIT will cause the refcount to start at 0.  But
> this is not true.  PERCPU_REF_ALLOW_REINIT starts the count at 1 as
> if the flags were zero.  Add this fact to the kernel doc comment.

Did this get picked up?  Or am I wrong in the comment?

Ira

> 
> Signed-off-by: Ira Weiny <ira.weiny@intel.com>
> ---
>  lib/percpu-refcount.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/lib/percpu-refcount.c b/lib/percpu-refcount.c
> index 4f6c6ebbbbde..48d7fcff70b6 100644
> --- a/lib/percpu-refcount.c
> +++ b/lib/percpu-refcount.c
> @@ -50,9 +50,9 @@ static unsigned long __percpu *percpu_count_ptr(struct percpu_ref *ref)
>   * @flags: PERCPU_REF_INIT_* flags
>   * @gfp: allocation mask to use
>   *
> - * Initializes @ref.  If @flags is zero, @ref starts in percpu mode with a
> - * refcount of 1; analagous to atomic_long_set(ref, 1).  See the
> - * definitions of PERCPU_REF_INIT_* flags for flag behaviors.
> + * Initializes @ref.  If @flags is zero or PERCPU_REF_ALLOW_REINIT, @ref starts
> + * in percpu mode with a refcount of 1; analagous to atomic_long_set(ref, 1).
> + * See the definitions of PERCPU_REF_INIT_* flags for flag behaviors.
>   *
>   * Note that @release must not sleep - it may potentially be called from RCU
>   * callback context by percpu_ref_kill().
> -- 
> 2.21.0
>