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printk: nbcon: Export nbcon_write_context_set_buf

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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: Petr Mladek <pmladek@suse.com>
Reviewed-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com>
Link: https://patch.msgid.link/20251016-nbcon-kgdboc-v6-4-866aac60a80e@suse.com
Signed-off-by: Petr Mladek <pmladek@suse.com>
This commit is contained in:
Marcos Paulo de Souza
2025-10-16 11:47:57 -03:00
committed by Petr Mladek
parent 286b113d70
commit 4349cf0df3
2 changed files with 6 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/console.h
View File

@@ -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) { }

4
kernel/printk/nbcon.c
View File

@@ -854,8 +854,8 @@ out:
return nbcon_context_can_proceed(ctxt, &cur);
}
static void nbcon_write_context_set_buf(struct nbcon_write_context *wctxt,
char *buf, unsigned int len)
void nbcon_write_context_set_buf(struct nbcon_write_context *wctxt,
char *buf, unsigned int len)
{
struct nbcon_context *ctxt = &ACCESS_PRIVATE(wctxt, ctxt);
struct console *con = ctxt->console;