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authorPetr Mladek <pmladek@suse.com>2022-06-23 16:51:57 +0200
committerPetr Mladek <pmladek@suse.com>2022-06-23 18:41:40 +0200
commit07a22b61946f0b80065b0ddcc703b715f84355f5 (patch)
tree603db480323054a0890aab628637fb18d857554e /kernel/watchdog_hld.c
parentRevert "printk: add kthread console printers" (diff)
downloadlinux-07a22b61946f0b80065b0ddcc703b715f84355f5.tar.xz
linux-07a22b61946f0b80065b0ddcc703b715f84355f5.zip
Revert "printk: add functions to prefer direct printing"
This reverts commit 2bb2b7b57f81255c13f4395ea911d6bdc70c9fe2. The testing of 5.19 release candidates revealed missing synchronization between early and regular console functionality. It would be possible to start the console kthreads later as a workaround. But it is clear that console lock serialized console drivers between each other. It opens a big area of possible problems that were not considered by people involved in the development and review. printk() is crucial for debugging kernel issues and console output is very important part of it. The number of consoles is huge and a proper review would take some time. As a result it need to be reverted for 5.19. Link: https://lore.kernel.org/r/YrBdjVwBOVgLfHyb@alley Signed-off-by: Petr Mladek <pmladek@suse.com> Link: https://lore.kernel.org/r/20220623145157.21938-7-pmladek@suse.com
Diffstat (limited to '')
-rw-r--r--kernel/watchdog_hld.c4
1 files changed, 0 insertions, 4 deletions
diff --git a/kernel/watchdog_hld.c b/kernel/watchdog_hld.c
index 701f35f0e2d4..247bf0b1582c 100644
--- a/kernel/watchdog_hld.c
+++ b/kernel/watchdog_hld.c
@@ -135,8 +135,6 @@ static void watchdog_overflow_callback(struct perf_event *event,
if (__this_cpu_read(hard_watchdog_warn) == true)
return;
- printk_prefer_direct_enter();
-
pr_emerg("Watchdog detected hard LOCKUP on cpu %d\n",
this_cpu);
print_modules();
@@ -157,8 +155,6 @@ static void watchdog_overflow_callback(struct perf_event *event,
if (hardlockup_panic)
nmi_panic(regs, "Hard LOCKUP");
- printk_prefer_direct_exit();
-
__this_cpu_write(hard_watchdog_warn, true);
return;
}