Re: [PATCH] audit: Fix build failure by renaming struct node to struct audit_node

[Richard Guy Briggs]

On 2021-09-03 15:48, Christophe Leroy wrote:
> struct node defined in kernel/audit_tree.c conflicts with
> struct node defined in include/linux/node.h

Why?  What changed to start triggering this error?  This code has been
here for 15 years.  I am guessing changing the other one would affect
more code?

The patch itself looks fine to me.

Reviewed-by: Richard Guy Briggs <rgb@xxxxxxxxxx>

> 	  CC      kernel/audit_tree.o
> 	kernel/audit_tree.c:33:9: error: redefinition of 'struct node'
> 	   33 |  struct node {
> 	      |         ^~~~
> 	In file included from ./include/linux/cpu.h:17,
>                 	 from ./include/linux/static_call.h:102,
>                 	 from ./arch/powerpc/include/asm/machdep.h:10,
>                 	 from ./arch/powerpc/include/asm/archrandom.h:7,
>                 	 from ./include/linux/random.h:121,
>                 	 from ./include/linux/net.h:18,
>                 	 from ./include/linux/skbuff.h:26,
>                 	 from kernel/audit.h:11,
>                 	 from kernel/audit_tree.c:2:
> 	./include/linux/node.h:84:8: note: originally defined here
> 	   84 | struct node {
> 	      |        ^~~~
> 	make[2]: *** [kernel/audit_tree.o] Error 1
> 
> Rename it audit_node.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
> ---
>  kernel/audit_tree.c | 20 ++++++++++----------
>  1 file changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
> index b2be4e978ba3..d392cf4ec8e2 100644
> --- a/kernel/audit_tree.c
> +++ b/kernel/audit_tree.c
> @@ -30,7 +30,7 @@ struct audit_chunk {
>  	int count;
>  	atomic_long_t refs;
>  	struct rcu_head head;
> -	struct node {
> +	struct audit_node {
>  		struct list_head list;
>  		struct audit_tree *owner;
>  		unsigned index;		/* index; upper bit indicates 'will prune' */
> @@ -269,7 +269,7 @@ bool audit_tree_match(struct audit_chunk *chunk, struct audit_tree *tree)
>  
>  /* tagging and untagging inodes with trees */
>  
> -static struct audit_chunk *find_chunk(struct node *p)
> +static struct audit_chunk *find_chunk(struct audit_node *p)
>  {
>  	int index = p->index & ~(1U<<31);
>  	p -= index;
> @@ -322,7 +322,7 @@ static void replace_chunk(struct audit_chunk *new, struct audit_chunk *old)
>  	list_replace_rcu(&old->hash, &new->hash);
>  }
>  
> -static void remove_chunk_node(struct audit_chunk *chunk, struct node *p)
> +static void remove_chunk_node(struct audit_chunk *chunk, struct audit_node *p)
>  {
>  	struct audit_tree *owner = p->owner;
>  
> @@ -459,7 +459,7 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
>  {
>  	struct fsnotify_mark *mark;
>  	struct audit_chunk *chunk, *old;
> -	struct node *p;
> +	struct audit_node *p;
>  	int n;
>  
>  	mutex_lock(&audit_tree_group->mark_mutex);
> @@ -570,11 +570,11 @@ static void prune_tree_chunks(struct audit_tree *victim, bool tagged)
>  {
>  	spin_lock(&hash_lock);
>  	while (!list_empty(&victim->chunks)) {
> -		struct node *p;
> +		struct audit_node *p;
>  		struct audit_chunk *chunk;
>  		struct fsnotify_mark *mark;
>  
> -		p = list_first_entry(&victim->chunks, struct node, list);
> +		p = list_first_entry(&victim->chunks, struct audit_node, list);
>  		/* have we run out of marked? */
>  		if (tagged && !(p->index & (1U<<31)))
>  			break;
> @@ -616,7 +616,7 @@ static void trim_marked(struct audit_tree *tree)
>  	}
>  	/* reorder */
>  	for (p = tree->chunks.next; p != &tree->chunks; p = q) {
> -		struct node *node = list_entry(p, struct node, list);
> +		struct audit_node *node = list_entry(p, struct audit_node, list);
>  		q = p->next;
>  		if (node->index & (1U<<31)) {
>  			list_del_init(p);
> @@ -684,7 +684,7 @@ void audit_trim_trees(void)
>  		struct audit_tree *tree;
>  		struct path path;
>  		struct vfsmount *root_mnt;
> -		struct node *node;
> +		struct audit_node *node;
>  		int err;
>  
>  		tree = container_of(cursor.next, struct audit_tree, list);
> @@ -839,7 +839,7 @@ int audit_add_tree_rule(struct audit_krule *rule)
>  	drop_collected_mounts(mnt);
>  
>  	if (!err) {
> -		struct node *node;
> +		struct audit_node *node;
>  		spin_lock(&hash_lock);
>  		list_for_each_entry(node, &tree->chunks, list)
>  			node->index &= ~(1U<<31);
> @@ -938,7 +938,7 @@ int audit_tag_tree(char *old, char *new)
>  		mutex_unlock(&audit_filter_mutex);
>  
>  		if (!failed) {
> -			struct node *node;
> +			struct audit_node *node;
>  			spin_lock(&hash_lock);
>  			list_for_each_entry(node, &tree->chunks, list)
>  				node->index &= ~(1U<<31);
> -- 
> 2.25.0
> 
> --
> Linux-audit mailing list
> Linux-audit@xxxxxxxxxx
> https://listman.redhat.com/mailman/listinfo/linux-audit
> 

- RGB

--
Richard Guy Briggs <rgb@xxxxxxxxxx>
Sr. S/W Engineer, Kernel Security, Base Operating Systems
Remote, Ottawa, Red Hat Canada
IRC: rgb, SunRaycer
Voice: +1.647.777.2635, Internal: (81) 32635