[PATCH 01/10] tty: tty_buffer: switch data type to u8

Jiri Slaby (SUSE)
2023-08-16T10:56:39Z

There is no reason to have tty_buffer::data typed as unsigned long.
Switch to u8, but preserve the ulong alignment using __aligned.

This allows for the cast removal from char_buf_ptr(). And for use of
struct_size() in the allocation in tty_buffer_alloc() -- in the next
patch.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
---
include/linux/tty_buffer.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/tty_buffer.h b/include/linux/tty_buffer.h
index e45cba81d0e9..31125e3be3c5 100644
--- a/include/linux/tty_buffer.h
+++ b/include/linux/tty_buffer.h
@@ -19,12 +19,12 @@ struct tty_buffer {
unsigned int read;
bool flags;
/* Data points here */
- unsigned long data[];
+ u8 data[] __aligned(sizeof(unsigned long));
};

static inline u8 *char_buf_ptr(struct tty_buffer *b, unsigned int ofs)
{
- return ((u8 *)b->data) + ofs;
+ return b->data + ofs;
}

static inline u8 *flag_buf_ptr(struct tty_buffer *b, unsigned int ofs)
--
2.41.0