From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Mikael Pettersson <mikpe@csd.uu.se>
Cc: Andrew Morton <akpm@osdl.org>,
Linux Kernel list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH][2.6.9-rc2-mm3] perfctr ppc32 preliminary interrupt support
Date: Mon, 27 Sep 2004 09:49:45 +1000 [thread overview]
Message-ID: <1096242585.4965.3.camel@gaston> (raw)
In-Reply-To: <200409262305.i8QN59b4012254@harpo.it.uu.se>
> Tested on an MPC7455 (G4-type chip). The patch applies cleanly
> to and compiles ok in 2.6.9-rc2-mm3, but 2.6.9-rc2-mm3 has
> other problems on PPC32 so I tested it with 2.6.9-rc2 vanilla.
Be careful that some G4's have a bug which can cause a
perf monitor interrupt to crash your kernel :( Basically, the
problem is if any of TAU or PerfMon interrupt happens at the
same time as a DEC interrupt, some revs of the CPU can get
confused and lose the previous exception state.
Check out the erratas, but it may be worth adding a cputable
feature bit entry to note which models have useable interrupt
and which don't.
next prev parent reply other threads:[~2004-09-26 23:51 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-26 23:05 [PATCH][2.6.9-rc2-mm3] perfctr ppc32 preliminary interrupt support Mikael Pettersson
2004-09-26 23:49 ` Benjamin Herrenschmidt [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-09-27 0:25 Mikael Pettersson
2004-09-27 0:36 ` Benjamin Herrenschmidt
2004-09-27 20:05 Albert Cahalan
2004-09-27 22:54 ` Benjamin Herrenschmidt
2004-09-29 11:48 Mikael Pettersson
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