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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-08-07 13:11:44 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-08-07 13:11:49 +0000
commitf25552c1068a054f2d99afd67a671d5991bf19c1 (patch)
treed70de5c7262ad572f8323fc4184b8a10522e81ec /debian/patches-rt/0047-printk-Provide-threadprintk-boot-argument.patch
parentMerging upstream version 6.9.7. (diff)
downloadlinux-f25552c1068a054f2d99afd67a671d5991bf19c1.tar.xz
linux-f25552c1068a054f2d99afd67a671d5991bf19c1.zip
Merging debian version 6.9.7-1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'debian/patches-rt/0047-printk-Provide-threadprintk-boot-argument.patch')
-rw-r--r--debian/patches-rt/0047-printk-Provide-threadprintk-boot-argument.patch96
1 files changed, 0 insertions, 96 deletions
diff --git a/debian/patches-rt/0047-printk-Provide-threadprintk-boot-argument.patch b/debian/patches-rt/0047-printk-Provide-threadprintk-boot-argument.patch
deleted file mode 100644
index cc47be3205..0000000000
--- a/debian/patches-rt/0047-printk-Provide-threadprintk-boot-argument.patch
+++ /dev/null
@@ -1,96 +0,0 @@
-From: John Ogness <john.ogness@linutronix.de>
-Date: Tue, 6 Feb 2024 14:19:34 +0000
-Subject: [PATCH 47/48] printk: Provide threadprintk boot argument
-Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.8/older/patches-6.8.2-rt11.tar.xz
-
-For PREEMPT_RT, legacy console printing is performed in a dedicated
-kthread. However, this behavior can also be interesting for other
-preemption models as it minimizes the duration of printk() calls by
-deferring all printing.
-
-Provide a new boot argument "threadprintk" that will create the
-dedicated kthread for legacy console printing for !PREEMPT_RT
-systems.
-
-The implementation is the same as "threadirqs" boot argument.
-
-Users should be aware that if this option is enabled, the shutdown,
-reboot, and panic messages probably will not be visible on the
-legacy consoles.
-
-Non-legacy consoles (NBCON) already have their own dedicated kernel
-threads for printing and reliable shutdown, reboot, and panic
-printing. This option really only applies to legacy consoles.
-
-Users can view /proc/consoles to see if their console driver is
-legacy or not. NBCON console drivers are shown with 'N'.
-
-Signed-off-by: John Ogness <john.ogness@linutronix.de>
-Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
----
- Documentation/admin-guide/kernel-parameters.txt | 12 ++++++++++++
- kernel/printk/internal.h | 4 +++-
- kernel/printk/printk.c | 11 +++++++++++
- 3 files changed, 26 insertions(+), 1 deletion(-)
-
---- a/Documentation/admin-guide/kernel-parameters.txt
-+++ b/Documentation/admin-guide/kernel-parameters.txt
-@@ -6508,6 +6508,18 @@
- Force threading of all interrupt handlers except those
- marked explicitly IRQF_NO_THREAD.
-
-+ threadprintk [KNL]
-+ Force threaded printing of all legacy consoles. Be
-+ aware that with this option, the shutdown, reboot, and
-+ panic messages may not be printed on the legacy
-+ consoles. Also, earlycon/earlyprintk printing will be
-+ delayed until a regular console or the kthread is
-+ available.
-+
-+ Users can view /proc/consoles to see if their console
-+ driver is legacy or not. Non-legacy (NBCON) console
-+ drivers are already threaded and are shown with 'N'.
-+
- topology= [S390]
- Format: {off | on}
- Specify if the kernel should make use of the cpu
---- a/kernel/printk/internal.h
-+++ b/kernel/printk/internal.h
-@@ -3,6 +3,7 @@
- * internal.h - printk internal definitions
- */
- #include <linux/console.h>
-+#include <linux/jump_label.h>
- #include <linux/percpu.h>
- #include <linux/types.h>
-
-@@ -24,7 +25,8 @@ int devkmsg_sysctl_set_loglvl(struct ctl
- #ifdef CONFIG_PREEMPT_RT
- # define force_printkthreads() (true)
- #else
--# define force_printkthreads() (false)
-+DECLARE_STATIC_KEY_FALSE(force_printkthreads_key);
-+# define force_printkthreads() (static_branch_unlikely(&force_printkthreads_key))
- #endif
-
- #ifdef CONFIG_PRINTK
---- a/kernel/printk/printk.c
-+++ b/kernel/printk/printk.c
-@@ -195,6 +195,17 @@ static int __init control_devkmsg(char *
- }
- __setup("printk.devkmsg=", control_devkmsg);
-
-+#if !defined(CONFIG_PREEMPT_RT)
-+DEFINE_STATIC_KEY_FALSE(force_printkthreads_key);
-+
-+static int __init setup_forced_printkthreads(char *arg)
-+{
-+ static_branch_enable(&force_printkthreads_key);
-+ return 0;
-+}
-+early_param("threadprintk", setup_forced_printkthreads);
-+#endif
-+
- char devkmsg_log_str[DEVKMSG_STR_MAX_SIZE] = "ratelimit";
- #if defined(CONFIG_PRINTK) && defined(CONFIG_SYSCTL)
- int devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write,