diff mbox series

[v4] fs/proc/base.c: fix incorrect fmode_t casts

Message ID 7761c3fd-4fb5-1d65-c2e6-044d689de6b6@openvz.org (mailing list archive)
State New, archived
Headers show
Series [v4] fs/proc/base.c: fix incorrect fmode_t casts | expand

Commit Message

Vasily Averin May 23, 2022, 3:37 a.m. UTC 
Fixes sparce warnings:
fs/proc/base.c:2240:25: sparse: warning: cast to restricted fmode_t
fs/proc/base.c:2297:42: sparse: warning: cast from restricted fmode_t
fs/proc/base.c:2394:48: sparse: warning: cast from restricted fmode_t

fmode_t is birwie type and requires __force attribute for any cast

Signed-off-by: Vasily Averin <vvs@openvz.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
v4: improved according to Matthew Wilcox's hint
v3: split, reworked according to Christoph Hellwig recommendation
---
 fs/proc/base.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Comments

Matthew Wilcox May 23, 2022, 3:48 a.m. UTC | #1 
On Mon, May 23, 2022 at 06:37:29AM +0300, Vasily Averin wrote:
> Fixes sparce warnings:
> fs/proc/base.c:2240:25: sparse: warning: cast to restricted fmode_t
> fs/proc/base.c:2297:42: sparse: warning: cast from restricted fmode_t
> fs/proc/base.c:2394:48: sparse: warning: cast from restricted fmode_t
> 
> fmode_t is birwie type and requires __force attribute for any cast
> 
> Signed-off-by: Vasily Averin <vvs@openvz.org>
> Reviewed-by: Christoph Hellwig <hch@lst.de>

Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Christian Brauner May 23, 2022, 9:40 a.m. UTC | #2 
On Mon, May 23, 2022 at 06:37:29AM +0300, Vasily Averin wrote:
> Fixes sparce warnings:
> fs/proc/base.c:2240:25: sparse: warning: cast to restricted fmode_t
> fs/proc/base.c:2297:42: sparse: warning: cast from restricted fmode_t
> fs/proc/base.c:2394:48: sparse: warning: cast from restricted fmode_t
> 
> fmode_t is birwie type and requires __force attribute for any cast
> 
> Signed-off-by: Vasily Averin <vvs@openvz.org>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> ---

Looks good to me,
Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org>
diff mbox series

Patch

diff --git a/fs/proc/base.c b/fs/proc/base.c
index c1031843cc6a..89521d3fc456 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2237,7 +2237,7 @@  static struct dentry *
 proc_map_files_instantiate(struct dentry *dentry,
 			   struct task_struct *task, const void *ptr)
 {
-	fmode_t mode = (fmode_t)(unsigned long)ptr;
+	fmode_t mode = *(fmode_t *)ptr;
 	struct proc_inode *ei;
 	struct inode *inode;
 
@@ -2294,7 +2294,7 @@  static struct dentry *proc_map_files_lookup(struct inode *dir,
 
 	if (vma->vm_file)
 		result = proc_map_files_instantiate(dentry, task,
-				(void *)(unsigned long)vma->vm_file->f_mode);
+						    &vma->vm_file->f_mode);
 
 out_no_vma:
 	mmap_read_unlock(mm);
@@ -2391,7 +2391,7 @@  proc_map_files_readdir(struct file *file, struct dir_context *ctx)
 				      buf, len,
 				      proc_map_files_instantiate,
 				      task,
-				      (void *)(unsigned long)p->mode))
+				      &p->mode))
 			break;
 		ctx->pos++;
 	}