[lkml]   [2006]   [Jul]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [2.6.18-rc2-gabb5a5cc BUG] Lukewarm IQ detected in hotplug locking
On 26/07/06, Michal Piotrowski <> wrote:
> Here is the bad commit
> aa95387774039096c11803c04011f1aa42d85758 is first bad commit
> commit aa95387774039096c11803c04011f1aa42d85758
> Author: Linus Torvalds <>
> Date: Sun Jul 23 12:12:16 2006 -0700
> cpu hotplug: simplify and hopefully fix locking
> The CPU hotplug locking was quite messy, with a recursive lock to
> handle the fact that both the actual up/down sequence wanted to
> protect itself from being re-entered, but the callbacks that it
> called also tended to want to protect themselves from CPU events.
> This splits the lock into two (one to serialize the whole hotplug
> sequence, the other to protect against the CPU present bitmaps
> changing). The latter still allows recursive usage because some
> subsystems (ondemand policy for cpufreq at least) had already gotten
> too used to the lax locking, but the locking mistakes are hopefully
> now less fundamental, and we now warn about recursive lock usage
> when we see it, in the hope that it can be fixed.
> Signed-off-by: Linus Torvalds <>
> :040000 040000 9189d56fe28f6823287e9d1e79976e68074da5db
> 266b4ea87d2ac441bc02ad2c
> 4ba2c4f332c7c0ce M include
> :040000 040000 3dfe69afef86aef8e6472d6d543ba965833e201b
> bfb64b2824c1e23f0629e976
> 2526fd11b789d51e M kernel

Sorry for the noise.

The bug is fixed in latest git tree.


Michal K. K. Piotrowski
LTG - Linux Testers Group
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2006-07-26 17:05    [W:0.048 / U:1.856 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site