From: Shida Zhang <zhangshida@kylinos.cn>

Now that all potential callers of bio_chain_endio have been
eliminated, completely prohibit any future calls to this function.

Suggested-by: Ming Lei <ming.lei@redhat.com>
Suggested-by: Andreas Gruenbacher <agruenba@redhat.com>
Suggested-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Shida Zhang <zhangshida@kylinos.cn>
---
 block/bio.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/block/bio.c b/block/bio.c
index b3a79285c27..cfb751dfcf5 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -320,9 +320,13 @@ static struct bio *__bio_chain_endio(struct bio *bio)
 	return parent;
 }
 
+/**
+ * This function should only be used as a flag and must never be called.
+ * If execution reaches here, it indicates a serious programming error.
+ */
 static void bio_chain_endio(struct bio *bio)
 {
-	bio_endio(__bio_chain_endio(bio));
+	BUG();
 }
 
 /**
-- 
2.34.1

On Thu, Dec 04, 2025 at 10:47:47AM +0800, zhangshida wrote:
> From: Shida Zhang <zhangshida@kylinos.cn>
> 
> Now that all potential callers of bio_chain_endio have been
> eliminated, completely prohibit any future calls to this function.
> 
> Suggested-by: Ming Lei <ming.lei@redhat.com>
> Suggested-by: Andreas Gruenbacher <agruenba@redhat.com>
> Suggested-by: Christoph Hellwig <hch@infradead.org>
> Signed-off-by: Shida Zhang <zhangshida@kylinos.cn>
> ---
>  block/bio.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/block/bio.c b/block/bio.c
> index b3a79285c27..cfb751dfcf5 100644
> --- a/block/bio.c
> +++ b/block/bio.c
> @@ -320,9 +320,13 @@ static struct bio *__bio_chain_endio(struct bio *bio)
>  	return parent;
>  }
>  
> +/**
> + * This function should only be used as a flag and must never be called.
> + * If execution reaches here, it indicates a serious programming error.
> + */

This is not a kerneldoc comment and thus should not use /** to start
the comment, otherwise the kerneldoc script will complain about
missing kernel doc elelemts.

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>

Christoph Hellwig <hch@infradead.org> 于2025年12月4日周四 17:40写道：
>
> On Thu, Dec 04, 2025 at 10:47:47AM +0800, zhangshida wrote:
> > From: Shida Zhang <zhangshida@kylinos.cn>
> >
> > Now that all potential callers of bio_chain_endio have been
> > eliminated, completely prohibit any future calls to this function.
> >
> > Suggested-by: Ming Lei <ming.lei@redhat.com>
> > Suggested-by: Andreas Gruenbacher <agruenba@redhat.com>
> > Suggested-by: Christoph Hellwig <hch@infradead.org>
> > Signed-off-by: Shida Zhang <zhangshida@kylinos.cn>
> > ---
> >  block/bio.c | 6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> >
> > diff --git a/block/bio.c b/block/bio.c
> > index b3a79285c27..cfb751dfcf5 100644
> > --- a/block/bio.c
> > +++ b/block/bio.c
> > @@ -320,9 +320,13 @@ static struct bio *__bio_chain_endio(struct bio *bio)
> >       return parent;
> >  }
> >
> > +/**
> > + * This function should only be used as a flag and must never be called.
> > + * If execution reaches here, it indicates a serious programming error.
> > + */
>
> This is not a kerneldoc comment and thus should not use /** to start
> the comment, otherwise the kerneldoc script will complain about
> missing kernel doc elelemts.
>

Thanks for catching that. I'll fix the comment format in the next revision.

Thanks,
Shida


> Otherwise looks good:
>
> Reviewed-by: Christoph Hellwig <hch@lst.de>