diff options
Diffstat (limited to '')
| -rw-r--r-- | debian/patches-rt/0123-printk-nbcon-Add-context-to-console_is_usable.patch | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/debian/patches-rt/0123-printk-nbcon-Add-context-to-console_is_usable.patch b/debian/patches-rt/0123-printk-nbcon-Add-context-to-console_is_usable.patch new file mode 100644 index 000000000..26a494c16 --- /dev/null +++ b/debian/patches-rt/0123-printk-nbcon-Add-context-to-console_is_usable.patch @@ -0,0 +1,111 @@ +From: John Ogness <john.ogness@linutronix.de> +Date: Tue, 26 Sep 2023 14:43:30 +0000 +Subject: [PATCH 123/134] printk: nbcon: Add context to console_is_usable() +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.6/older/patches-6.6.7-rt18.tar.xz + +The nbcon consoles have two callbacks to be used for different +contexts. In order to determine if an nbcon console is usable, +console_is_usable() needs to know if it is a context that will +use the write_atomic() callback or the write_thread() callback. + +Add an extra parameter @use_atomic to specify this. + +Signed-off-by: John Ogness <john.ogness@linutronix.de> +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + kernel/printk/internal.h | 16 ++++++++++------ + kernel/printk/nbcon.c | 6 +++--- + kernel/printk/printk.c | 6 ++++-- + 3 files changed, 17 insertions(+), 11 deletions(-) + +--- a/kernel/printk/internal.h ++++ b/kernel/printk/internal.h +@@ -100,7 +100,7 @@ void nbcon_kthread_create(struct console + * which can also play a role in deciding if @con can be used to print + * records. + */ +-static inline bool console_is_usable(struct console *con, short flags) ++static inline bool console_is_usable(struct console *con, short flags, bool use_atomic) + { + if (!(flags & CON_ENABLED)) + return false; +@@ -109,10 +109,13 @@ static inline bool console_is_usable(str + return false; + + if (flags & CON_NBCON) { +- if (!con->write_atomic) +- return false; +- if (!con->write_thread || !con->kthread) +- return false; ++ if (use_atomic) { ++ if (!con->write_atomic) ++ return false; ++ } else { ++ if (!con->write_thread || !con->kthread) ++ return false; ++ } + } else { + if (!con->write) + return false; +@@ -178,7 +181,8 @@ static inline void nbcon_atomic_flush_al + static inline bool nbcon_atomic_emit_next_record(struct console *con, bool *handover, + int cookie) { return false; } + +-static inline bool console_is_usable(struct console *con, short flags) { return false; } ++static inline bool console_is_usable(struct console *con, short flags, ++ bool use_atomic) { return false; } + + #endif /* CONFIG_PRINTK */ + +--- a/kernel/printk/nbcon.c ++++ b/kernel/printk/nbcon.c +@@ -963,7 +963,7 @@ static bool nbcon_kthread_should_wakeup( + + cookie = console_srcu_read_lock(); + flags = console_srcu_read_flags(con); +- is_usable = console_is_usable(con, flags); ++ is_usable = console_is_usable(con, flags, false); + console_srcu_read_unlock(cookie); + + if (!is_usable) +@@ -1022,7 +1022,7 @@ static int nbcon_kthread_func(void *__co + + con_flags = console_srcu_read_flags(con); + +- if (console_is_usable(con, con_flags)) { ++ if (console_is_usable(con, con_flags, false)) { + con->driver_enter(con, &flags); + + /* +@@ -1203,7 +1203,7 @@ static void __nbcon_atomic_flush_all(u64 + if (!(flags & CON_NBCON)) + continue; + +- if (!console_is_usable(con, flags)) ++ if (!console_is_usable(con, flags, true)) + continue; + + if (nbcon_seq_read(con) >= stop_seq) +--- a/kernel/printk/printk.c ++++ b/kernel/printk/printk.c +@@ -3040,7 +3040,7 @@ static bool console_flush_all(bool do_co + if ((flags & CON_NBCON) && con->kthread) + continue; + +- if (!console_is_usable(con, flags)) ++ if (!console_is_usable(con, flags, true)) + continue; + any_usable = true; + +@@ -3945,8 +3945,10 @@ static bool __pr_flush(struct console *c + * that they make forward progress, so only increment + * @diff for usable consoles. + */ +- if (!console_is_usable(c, flags)) ++ if (!console_is_usable(c, flags, true) && ++ !console_is_usable(c, flags, false)) { + continue; ++ } + + if (flags & CON_NBCON) { + printk_seq = nbcon_seq_read(c); |