* [PATCH v1] binderfs: remove separate device_initcall()
@ 2019-01-31 0:25 Christian Brauner
2019-02-06 1:16 ` Todd Kjos
0 siblings, 1 reply; 2+ messages in thread
From: Christian Brauner @ 2019-01-31 0:25 UTC (permalink / raw)
To: gregkh, tkjos, devel, linux-kernel, linux-fsdevel
Cc: arve, maco, joel, tkjos, Christian Brauner
binderfs should not have a separate device_initcall(). When a kernel is
compiled with CONFIG_ANDROID_BINDERFS register the filesystem alongside
CONFIG_ANDROID_IPC. This use-case is especially sensible when users specify
CONFIG_ANDROID_IPC=y, CONFIG_ANDROID_BINDERFS=y and
ANDROID_BINDER_DEVICES="".
When CONFIG_ANDROID_BINDERFS=n then this always succeeds so there's no
regression potential for legacy workloads.
Signed-off-by: Christian Brauner <christian@brauner.io>
---
/* Changelog */
- ensure that device_name is set to NULL so kfree() doesn't freak out
---
drivers/android/binder.c | 7 ++++++-
drivers/android/binder_internal.h | 9 +++++++++
drivers/android/binderfs.c | 4 +---
3 files changed, 16 insertions(+), 4 deletions(-)
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 57cf259de600..4d2b2ad1ee0e 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -5854,9 +5854,10 @@ static int __init init_binder_device(const char *name)
static int __init binder_init(void)
{
int ret;
- char *device_name, *device_names, *device_tmp;
+ char *device_name, *device_tmp;
struct binder_device *device;
struct hlist_node *tmp;
+ char *device_names = NULL;
ret = binder_alloc_shrinker_init();
if (ret)
@@ -5917,6 +5918,10 @@ static int __init binder_init(void)
}
}
+ ret = init_binderfs();
+ if (ret)
+ goto err_init_binder_device_failed;
+
return ret;
err_init_binder_device_failed:
diff --git a/drivers/android/binder_internal.h b/drivers/android/binder_internal.h
index 7fb97f503ef2..045b3e42d98b 100644
--- a/drivers/android/binder_internal.h
+++ b/drivers/android/binder_internal.h
@@ -46,4 +46,13 @@ static inline bool is_binderfs_device(const struct inode *inode)
}
#endif
+#ifdef CONFIG_ANDROID_BINDERFS
+extern int __init init_binderfs(void);
+#else
+static inline int __init init_binderfs(void)
+{
+ return 0;
+}
+#endif
+
#endif /* _LINUX_BINDER_INTERNAL_H */
diff --git a/drivers/android/binderfs.c b/drivers/android/binderfs.c
index 7a550104a722..e773f45d19d9 100644
--- a/drivers/android/binderfs.c
+++ b/drivers/android/binderfs.c
@@ -550,7 +550,7 @@ static struct file_system_type binder_fs_type = {
.fs_flags = FS_USERNS_MOUNT,
};
-static int __init init_binderfs(void)
+int __init init_binderfs(void)
{
int ret;
@@ -568,5 +568,3 @@ static int __init init_binderfs(void)
return ret;
}
-
-device_initcall(init_binderfs);
--
2.20.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v1] binderfs: remove separate device_initcall()
2019-01-31 0:25 [PATCH v1] binderfs: remove separate device_initcall() Christian Brauner
@ 2019-02-06 1:16 ` Todd Kjos
0 siblings, 0 replies; 2+ messages in thread
From: Todd Kjos @ 2019-02-06 1:16 UTC (permalink / raw)
To: Christian Brauner
Cc: Greg Kroah-Hartman, Todd Kjos, open list:ANDROID DRIVERS, LKML,
linux-fsdevel, Arve Hjønnevåg, Martijn Coenen, joel
On Wed, Jan 30, 2019 at 4:25 PM Christian Brauner <christian@brauner.io> wrote:
>
> binderfs should not have a separate device_initcall(). When a kernel is
> compiled with CONFIG_ANDROID_BINDERFS register the filesystem alongside
> CONFIG_ANDROID_IPC. This use-case is especially sensible when users specify
> CONFIG_ANDROID_IPC=y, CONFIG_ANDROID_BINDERFS=y and
> ANDROID_BINDER_DEVICES="".
> When CONFIG_ANDROID_BINDERFS=n then this always succeeds so there's no
> regression potential for legacy workloads.
>
> Signed-off-by: Christian Brauner <christian@brauner.io>
Acked-by: Todd Kjos <tkjos@google.com>
>
> ---
> /* Changelog */
> - ensure that device_name is set to NULL so kfree() doesn't freak out
> ---
> drivers/android/binder.c | 7 ++++++-
> drivers/android/binder_internal.h | 9 +++++++++
> drivers/android/binderfs.c | 4 +---
> 3 files changed, 16 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/android/binder.c b/drivers/android/binder.c
> index 57cf259de600..4d2b2ad1ee0e 100644
> --- a/drivers/android/binder.c
> +++ b/drivers/android/binder.c
> @@ -5854,9 +5854,10 @@ static int __init init_binder_device(const char *name)
> static int __init binder_init(void)
> {
> int ret;
> - char *device_name, *device_names, *device_tmp;
> + char *device_name, *device_tmp;
> struct binder_device *device;
> struct hlist_node *tmp;
> + char *device_names = NULL;
>
> ret = binder_alloc_shrinker_init();
> if (ret)
> @@ -5917,6 +5918,10 @@ static int __init binder_init(void)
> }
> }
>
> + ret = init_binderfs();
> + if (ret)
> + goto err_init_binder_device_failed;
> +
> return ret;
>
> err_init_binder_device_failed:
> diff --git a/drivers/android/binder_internal.h b/drivers/android/binder_internal.h
> index 7fb97f503ef2..045b3e42d98b 100644
> --- a/drivers/android/binder_internal.h
> +++ b/drivers/android/binder_internal.h
> @@ -46,4 +46,13 @@ static inline bool is_binderfs_device(const struct inode *inode)
> }
> #endif
>
> +#ifdef CONFIG_ANDROID_BINDERFS
> +extern int __init init_binderfs(void);
> +#else
> +static inline int __init init_binderfs(void)
> +{
> + return 0;
> +}
> +#endif
> +
> #endif /* _LINUX_BINDER_INTERNAL_H */
> diff --git a/drivers/android/binderfs.c b/drivers/android/binderfs.c
> index 7a550104a722..e773f45d19d9 100644
> --- a/drivers/android/binderfs.c
> +++ b/drivers/android/binderfs.c
> @@ -550,7 +550,7 @@ static struct file_system_type binder_fs_type = {
> .fs_flags = FS_USERNS_MOUNT,
> };
>
> -static int __init init_binderfs(void)
> +int __init init_binderfs(void)
> {
> int ret;
>
> @@ -568,5 +568,3 @@ static int __init init_binderfs(void)
>
> return ret;
> }
> -
> -device_initcall(init_binderfs);
> --
> 2.20.1
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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