From: john stultz <johnstul@us.ibm.com>
To: Andrew Morton <akpm@osdl.org>
Cc: lkml <linux-kernel@vger.kernel.org>,
venkatesh.pallipadi@intel.com,
"Martin J. Bligh" <mbligh@aracnet.com>,
Dave H <haveblue@us.ibm.com>
Subject: Re: [PATCH] linux-2.6.0-test4_cyclone-hpet-fix_A0
Date: 04 Sep 2003 00:14:12 -0700 [thread overview]
Message-ID: <1062659651.2246.11.camel@laptop.cornchips.homelinux.net> (raw)
In-Reply-To: <20030903225939.77630b19.akpm@osdl.org>
On Wed, 2003-09-03 at 22:59, Andrew Morton wrote:
> john stultz <johnstul@us.ibm.com> wrote:
> >
> > Andrew, All,
> > I probably should have been more active in reviewing the HPET code
> > before it went in, but I've been somewhat occupied with other bugs
> > recently. I'm excited to see someone else using my time-source
> > interface, however the HPET patch definitely pushes the interface beyond
> > its design (not a bad thing, just makes for some short term uglies).
> > Having multiple interrupt sources as well as time sources will generate
> > some work for 2.7 to clean it all up.
> >
> > Anyway, the HPET changes made calibrate_tsc() static, which it probably
> > should be, but it broke the timer_cyclone code. This patch fixes it back
> > up by re-implementing calibrate_tsc() locally as it was done in
> > timer_hpet.c
>
> <stdrant>
> Of course if some bozo had stuck this:
>
> extern unsigned long calibrate_tsc(void);
>
> in a header file rather than in a .c file (timer_cyclone.c), this problem
> would not have occurred. Nevereverever put extern declarations in .c files!
> </stdrant>
Yea, I'll fess up, I was the bozo (and probably still am). It was my
poor attempt at getting friend-like access to functions I really
shouldn't.
>
> Can we not we avoid the cut-n-paste coding?
>
> There is also timer_tsc.c:calibrate_tsc_hpet() which is almost the same as
> timer_hpet.c:calibrate_tsc(). Seem to me that we could tweak
> calibrate_tsc_hpet() a bit, unstaticalise timer_tsc.c:calibrate_tsc() and
> have two functions rather than four?
Yes, I was just being hesitant and trying to keep changes localized.
I'll try to take a more confident swing at it tomorrow.
> > Also, while apparently unrelated, but touching code from the HPET patch,
> > I'm seeing some form of memory corruption on the 16way x440 which is
> > overwriting the wait_timer_tick pointer in apic.c I added some
> > initialized corruption pad variables around the pointer and they're
> > definitely being trampled. I'll have to look into it further tomorrow.
>
> Hum. Please do this:
>
> mnm:/usr/src/25> nm -n vmlinux|grep -3 wait_timer_tick
> c043b360 D using_apic_timer
> c043b380 d lapic_sysclass
> c043b3e0 d device_lapic
> c043b41c D wait_timer_tick
> c043b420 D nmi_watchdog
> c043b424 d nmi_hz
> c043b440 d nmi_sysclass
[jstultz@elm3a16 cyclone-hpet-fix]$ nm -n vmlinux | grep -6 wait_timer_tick
c03977e0 D mp_bus_id_to_pci_bus
c0397860 D boot_cpu_physical_apicid
c0397864 D boot_cpu_logical_apicid
c0397868 D bios_cpu_apicid
c0397870 D using_apic_timer
c0397874 D corruption_pad1
c0397878 D wait_timer_tick
c039787c D corruption_pad2
c0397880 D nmi_watchdog
c0397884 d nmi_hz
c0397888 d nmi_print_lock
c03978a0 d ioapic_lock
c03978a4 D sis_apic_bug
I can send you the whole System.map if needed, but
mp_bus_id_to_pci_bus[] looks suspicious to me.
> It could be an overrun accessing device_lapic. There's a patch in -mm
> which plays around with kobject.name although I can't immediately see why
> it would cause this to happen. If the problem ocurs in -mm and not in
> -linus then we need to be looking suspiciously at
>
> kobject-unlimited-name-lengths.patch
> and
> kobject-unlimited-name-lengths-use-after-free-fix.patch
I was seeing this in 2.5.bk-current as of a few hours ago.
next prev parent reply other threads:[~2003-09-04 7:17 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-04 4:29 [PATCH] linux-2.6.0-test4_cyclone-hpet-fix_A0 john stultz
2003-09-04 5:59 ` Andrew Morton
2003-09-04 7:14 ` john stultz [this message]
2003-09-04 14:48 ` Martin J. Bligh
2003-09-04 17:21 Pallipadi, Venkatesh
2003-09-04 17:53 ` john stultz
2003-09-04 18:04 ` Andrew Morton
2003-09-04 18:23 Pallipadi, Venkatesh
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1062659651.2246.11.camel@laptop.cornchips.homelinux.net \
--to=johnstul@us.ibm.com \
--cc=akpm@osdl.org \
--cc=haveblue@us.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mbligh@aracnet.com \
--cc=venkatesh.pallipadi@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).