lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:	Tue, 14 Nov 2006 15:28:47 -0800
From:	Suleiman Souhlal <ssouhlal@...eBSD.org>
To:	Andi Kleen <ak@...e.de>
CC:	Linux Kernel ML <linux-kernel@...r.kernel.org>, vojtech@...e.cz,
	Jiri Bohac <jbohac@...e.cz>
Subject: [PATCH 0/1] Try 2: Make the TSC safe to be use by gettimeofday().

Hi,

Here are the fixes from the previous version:
- Don't use hard_smp_processor_id().
- Use the PDA to store a pointer to the current CPU's vxtime data.
- Use vgetcpu() to get the CPU number from vgettimeofday()
  (Due to a bug in vgetcpu(), this only works with CONFIG_HOTPLUG_CPU=y)
- No externs in .c files
- Use idle notifiers instead of doing the HPET read in switch_to
- Fix race in vgettimeofday() by checking the RIP of the process we're switching away from
  in switch_to, and touching the vxtime seqlock if it happens to be in the VSYSCALL page.
  (I hope this is not considered too much work for switch_to)
- Remove usage of preempt_disable/enable() in do_gettimeoday(), since the above fix make it
  unnecessary.

-- Suleiman

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists