printk: allow disabling printk per-console device kthreads at boot
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From 2767891ad81d4a0077f8f2123b7ce3b03b55289e Mon Sep 17 00:00:00 2001
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From: "Luis Claudio R. Goncalves" <lgoncalv@redhat.com>
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Date: Wed, 13 Mar 2024 10:07:11 -0300
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Subject: [PATCH] printk: allow disabling printk per-console device kthreads at
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boot
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JIRA: https://issues.redhat.com/browse/RHEL-17709
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Upstream Status: RHEL only
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Create the 'printk_no_perconsole_kthreads' boot parameter, allowing one to disable the
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per-console device printk kthreads, which are enabled by default.
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Signed-off-by: Luis Claudio R. Goncalves <lgoncalv@redhat.com>
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---
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.../admin-guide/kernel-parameters.txt | 4 +++
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kernel/printk/printk.c | 26 +++++++++++++++++++
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2 files changed, 30 insertions(+)
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diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
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index fca105370555..8a6d9d23bb65 100644
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--- a/Documentation/admin-guide/kernel-parameters.txt
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+++ b/Documentation/admin-guide/kernel-parameters.txt
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@@ -4526,6 +4526,10 @@
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printk.time= Show timing data prefixed to each printk message line
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Format: <bool> (1/Y/y=enable, 0/N/n=disable)
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+ printk_no_perconsole_kthreads
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+ [KNL] Disable the printk per-console device kthreads.
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+ This option is not available for RT kernels.
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+
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processor.max_cstate= [HW,ACPI]
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Limit processor to maximum C-state
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max_cstate=9 overrides any DMI blacklist limit.
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diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
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index f1f9ce9b23f6..aeb9b85dcb06 100644
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--- a/kernel/printk/printk.c
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+++ b/kernel/printk/printk.c
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@@ -3853,10 +3853,36 @@ static int __init printk_late_init(void)
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}
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late_initcall(printk_late_init);
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+/*
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+ * This boot parameter allows one to disable the per-console device printk
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+ * kernel threads, which are enabled by default.
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+ */
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+static bool __read_mostly printk_no_perconsole_kthreads = false;
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+
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+static int __init disable_printk_pdkth_setup(char *str)
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+{
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+ if (!IS_ENABLED(CONFIG_PREEMPT_RT)) {
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+ printk_no_perconsole_kthreads = true;
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+ pr_info("Disabling printk per-console device kthreads.\n");
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+ } else {
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+ pr_info("Can't disable printk per-console device kthreads on RT.\n");
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+ }
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+
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+ return 0;
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+}
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+
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+early_param("printk_no_perconsole_kthreads", disable_printk_pdkth_setup);
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+module_param(printk_no_perconsole_kthreads, bool, S_IRUGO | S_IWUSR);
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+MODULE_PARM_DESC(printk_no_perconsole_kthreads,
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+ "Disable printk per-console device kthreads.");
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+
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static int __init printk_activate_kthreads(void)
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{
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struct console *con;
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+ if (unlikely(printk_no_perconsole_kthreads))
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+ return 0;
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+
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console_lock();
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printk_kthreads_available = true;
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for_each_console(con)
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--
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2.27.0
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@ -960,6 +960,7 @@ Patch1: patch-%{patchversion}-redhat.patch
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# AlmaLinux patches
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# AlmaLinux patches
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Patch1001: 0001-nvme-pci-add-BOGUS_NID-for-Intel-0a54-device.patch
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Patch1001: 0001-nvme-pci-add-BOGUS_NID-for-Intel-0a54-device.patch
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Patch1002: 0001-printk-allow-disabling-printk-per-console-device-kth.patch
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# Bring back deprecated PCI ids #CFHack #CFHack2024
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# Bring back deprecated PCI ids #CFHack #CFHack2024
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Patch2001: 0001-Enable-all-disabled-pci-devices-by-moving-to-unmaint.patch
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Patch2001: 0001-Enable-all-disabled-pci-devices-by-moving-to-unmaint.patch
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@ -1715,6 +1716,7 @@ ApplyOptionalPatch patch-%{patchversion}-redhat.patch
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%endif
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%endif
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ApplyPatch 0001-nvme-pci-add-BOGUS_NID-for-Intel-0a54-device.patch
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ApplyPatch 0001-nvme-pci-add-BOGUS_NID-for-Intel-0a54-device.patch
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ApplyPatch 0001-printk-allow-disabling-printk-per-console-device-kth.patch
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ApplyOptionalPatch linux-kernel-test.patch
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ApplyOptionalPatch linux-kernel-test.patch
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@ -3780,6 +3782,7 @@ fi
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- be2iscsi: bring back deprecated PCI ids
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- be2iscsi: bring back deprecated PCI ids
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- nvme-pci: add BOGUS_NID for Intel 0a54 device
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- nvme-pci: add BOGUS_NID for Intel 0a54 device
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- kernel/rh_messages.h: empty rh_disabled_pci_devices and rh_unmaintained_pci_devices lists
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- kernel/rh_messages.h: empty rh_disabled_pci_devices and rh_unmaintained_pci_devices lists
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- printk: allow disabling printk per-console device kthreads at boot
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* Thu Feb 22 2024 Scott Weaver <scweaver@redhat.com> [5.14.0-427.el9]
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* Thu Feb 22 2024 Scott Weaver <scweaver@redhat.com> [5.14.0-427.el9]
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- scsi: smartpqi: Fix disable_managed_interrupts (Tomas Henzl) [RHEL-26145]
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- scsi: smartpqi: Fix disable_managed_interrupts (Tomas Henzl) [RHEL-26145]
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