diff options
| author | Sean Young <sean@mess.org> | 2017-10-08 12:12:16 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-11 12:48:12 +0200 |
| commit | d63af6c931f73b4597e37816ed4e77ee690ada82 (patch) | |
| tree | c0939eee63e049057d6d815ccbed4d17b6fa614e /include | |
| parent | fb2479ddfb0b1eae0d60868aa444aace4ce6287c (diff) | |
kfifo: DECLARE_KIFO_PTR(fifo, u64) does not work on arm 32 bit
commit 8a866fee3909c49738e1c4429a8d2b9bf27e015d upstream.
If you try to store u64 in a kfifo (or a struct with u64 members),
then the buf member of __STRUCT_KFIFO_PTR will cause 4 bytes
padding due to alignment (note that struct __kfifo is 20 bytes
on 32 bit).
That in turn causes the __is_kfifo_ptr() to fail, which is caught
by kfifo_alloc(), which now returns EINVAL.
So, ensure that __is_kfifo_ptr() compares to the right structure.
Signed-off-by: Sean Young <sean@mess.org>
Acked-by: Stefani Seibold <stefani@seibold.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Matthew Weber <matthew.weber@collins.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/kfifo.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/kfifo.h b/include/linux/kfifo.h index 41eb6fdf87a8..86b5fb08e96c 100644 --- a/include/linux/kfifo.h +++ b/include/linux/kfifo.h @@ -113,7 +113,8 @@ struct kfifo_rec_ptr_2 __STRUCT_KFIFO_PTR(unsigned char, 2, void); * array is a part of the structure and the fifo type where the array is * outside of the fifo structure. */ -#define __is_kfifo_ptr(fifo) (sizeof(*fifo) == sizeof(struct __kfifo)) +#define __is_kfifo_ptr(fifo) \ + (sizeof(*fifo) == sizeof(STRUCT_KFIFO_PTR(typeof(*(fifo)->type)))) /** * DECLARE_KFIFO_PTR - macro to declare a fifo pointer object |