printk: queue wake_up_klogd irq_work only if per-CPU areas are ready

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Subject: printk: queue wake_up_klogd irq_work only if per-CPU areas are ready
From: Sergey Senozhatsky <sergey.senozhatsky.work@xxxxxxxxx>
Date: Tue, 14 Apr 2020 21:06:13 +0900
Cc: Petr Mladek <pmladek@xxxxxxxx>

Hello,

Commit ab6f762f0f53162d41 Linus' HEAD.

printk_deferred() does not make sure that it's safe to write to
per-CPU data, which causes problems when printk_deferred() is
invoked "too early", before per-CPU areas are initialized. There
are multiple bug reports, e.g.
https://bugzilla.kernel.org/show_bug.cgi?id=206847

	-ss

Follow-Ups:
- Re: printk: queue wake_up_klogd irq_work only if per-CPU areas are ready
  - From: Greg KH

Prev by Date: FAILED: patch "[PATCH] erofs: correct the remaining shrink objects" failed to apply to 4.19-stable tree
Next by Date: Re: printk: queue wake_up_klogd irq_work only if per-CPU areas are ready
Previous by thread: FAILED: patch "[PATCH] erofs: correct the remaining shrink objects" failed to apply to 4.19-stable tree
Next by thread: Re: printk: queue wake_up_klogd irq_work only if per-CPU areas are ready
Index(es):
- Date
- Thread

[Index of Archives] [Linux Kernel] [Kernel Development Newbies] [Linux USB Devel] [Video for Linux] [Linux Audio Users] [Yosemite Hiking] [Linux Kernel] [Linux SCSI]

Powered by Linux