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tty: hvc_console: use flexible array for outbuf

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This means:
* move outbuf to the end of struct hvc_struct and convert from pointer
  to flexible array (the structure is smaller now)
* use struct_size() at the allocation site
* align outbuf in the struct instead of ALIGN() at kzalloc()

And apart from the above, use u8 instead of char (which are the same
thanks to -funsigned-char). The former is now preferred over the latter.

It makes the code easier to understand.

Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Cc: linuxppc-dev@lists.ozlabs.org
Link: https://lore.kernel.org/r/20231121092258.9334-12-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby (SUSE) 2023-11-21 10:22:52 +01:00 committed by Greg Kroah-Hartman
parent 4ccef1f142
commit 7588b08203
2 changed files with 2 additions and 4 deletions
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4
drivers/tty/hvc/hvc_console.c
View file

@ -922,8 +922,7 @@ struct hvc_struct *hvc_alloc(uint32_t vtermno, int data,
return ERR_PTR(err);
}
hp = kzalloc(ALIGN(sizeof(*hp), sizeof(long)) + outbuf_size,
GFP_KERNEL);
hp = kzalloc(struct_size(hp, outbuf, outbuf_size), GFP_KERNEL);
if (!hp)
return ERR_PTR(-ENOMEM);
@ -931,7 +930,6 @@ struct hvc_struct *hvc_alloc(uint32_t vtermno, int data,
hp->data = data;
hp->ops = ops;
hp->outbuf_size = outbuf_size;
hp->outbuf = &((char *)hp)[ALIGN(sizeof(*hp), sizeof(long))];
tty_port_init(&hp->port);
hp->port.ops = &hvc_port_ops;

2
drivers/tty/hvc/hvc_console.h
View file

@ -37,7 +37,6 @@ struct hvc_struct {
spinlock_t lock;
int index;
int do_wakeup;
char *outbuf;
int outbuf_size;
int n_outbuf;
uint32_t vtermno;
@ -48,6 +47,7 @@ struct hvc_struct {
struct work_struct tty_resize;
struct list_head next;
unsigned long flags;
u8 outbuf[] __aligned(sizeof(long));
};
/* implemented by a low level driver */