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SubjectRe: [PATCH 2/2] binderfs: remove separate device_initcall()
On Wed, Jan 30, 2019 at 10:17:39PM +0100, Greg KH wrote:
> On Wed, Jan 30, 2019 at 06:01:02PM +0100, Christian Brauner wrote:
> > On Wed, Jan 30, 2019 at 03:24:12PM +0100, Greg KH wrote:
> > > On Wed, Jan 23, 2019 at 12:41:16PM +0100, Christian Brauner 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>
> > > > ---
> > > > drivers/android/binder.c | 4 ++++
> > > > drivers/android/binder_internal.h | 9 +++++++++
> > > > drivers/android/binderfs.c | 4 +---
> > > > 3 files changed, 14 insertions(+), 3 deletions(-)
> > > >
> > > > diff --git a/drivers/android/binder.c b/drivers/android/binder.c
> > > > index cdfc87629efb..751d76173f81 100644
> > > > --- a/drivers/android/binder.c
> > > > +++ b/drivers/android/binder.c
> > > > @@ -5915,6 +5915,10 @@ static int __init binder_init(void)
> > > > goto err_init_binder_device_failed;
> > > > }
> > > >
> > > > + 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);
> > >
> > > I get a build warning when applying this patch :(
> >
> > Hm, I can't reproduce that build error with this patch applied to what
> > you currently have in char-misc-linus. :(
> > Any chance you can give me the config that produced this warning?
> > I tried with CONFIG_BINDERFS=y and CONFIG_BINDERFS=n.
>
> $ make M=drivers/android
> CC drivers/android/binderfs.o
> CC drivers/android/binder.o
> drivers/android/binder.c: In function ‘binder_init’:
> drivers/android/binder.c:5933:2: warning: ‘device_names’ may be used uninitialized in this function [-Wmaybe-uninitialized]
> kfree(device_names);
> ^~~~~~~~~~~~~~~~~~~
>
> $ gcc --version
> gcc (GCC) 8.2.1 20181127
>
> And gcc is right about this warning, that could happen with your change :(

Thanks for the pointer. New version sent out that fixes this issue! :)

Thanks!
Christian

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