Commit 4349cf0d authored by Marcos Paulo de Souza's avatar Marcos Paulo de Souza Committed by Petr Mladek
Browse files

printk: nbcon: Export nbcon_write_context_set_buf 



This function will be used in the next patch to allow a driver to set
both the message and message length of a nbcon_write_context. This is
necessary because the function also initializes the ->unsafe_takeover
struct member. By using this helper we ensure that the struct is
initialized correctly.

Reviewed-by: default avatarPetr Mladek <pmladek@suse.com>
Reviewed-by: default avatarJohn Ogness <john.ogness@linutronix.de>
Signed-off-by: default avatarMarcos Paulo de Souza <mpdesouza@suse.com>
Link: https://patch.msgid.link/20251016-nbcon-kgdboc-v6-4-866aac60a80e@suse.com


Signed-off-by: default avatarPetr Mladek <pmladek@suse.com>
parent 286b113d

include/linux/console.h

+4 −0
Original line number Diff line number Diff line
@@ -603,6 +603,8 @@ static inline bool console_is_registered(const struct console *con) 
extern void nbcon_cpu_emergency_enter(void);

extern void nbcon_cpu_emergency_exit(void);

extern bool nbcon_can_proceed(struct nbcon_write_context *wctxt);

extern void nbcon_write_context_set_buf(struct nbcon_write_context *wctxt,

					char *buf, unsigned int len);

extern bool nbcon_enter_unsafe(struct nbcon_write_context *wctxt);

extern bool nbcon_exit_unsafe(struct nbcon_write_context *wctxt);

extern void nbcon_reacquire_nobuf(struct nbcon_write_context *wctxt);
@@ -655,6 +657,8 @@ static inline bool console_is_usable(struct console *con, short flags, bool use_ 
static inline void nbcon_cpu_emergency_enter(void) { }

static inline void nbcon_cpu_emergency_exit(void) { }

static inline bool nbcon_can_proceed(struct nbcon_write_context *wctxt) { return false; }

static inline void nbcon_write_context_set_buf(struct nbcon_write_context *wctxt,

					       char *buf, unsigned int len) { }

static inline bool nbcon_enter_unsafe(struct nbcon_write_context *wctxt) { return false; }

static inline bool nbcon_exit_unsafe(struct nbcon_write_context *wctxt) { return false; }

static inline void nbcon_reacquire_nobuf(struct nbcon_write_context *wctxt) { }

kernel/printk/nbcon.c

+2 −2
Original line number Diff line number Diff line
@@ -854,7 +854,7 @@ static bool __nbcon_context_update_unsafe(struct nbcon_context *ctxt, bool unsaf 
	return nbcon_context_can_proceed(ctxt, &cur);

}



static void nbcon_write_context_set_buf(struct nbcon_write_context *wctxt,

void nbcon_write_context_set_buf(struct nbcon_write_context *wctxt,

				 char *buf, unsigned int len)

{

	struct nbcon_context *ctxt = &ACCESS_PRIVATE(wctxt, ctxt);