linux-kernel - Re: [PULL]: please pull changes for tip/cpus4096

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Date:	Tue, 13 Jan 2009 16:13:36 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Mike Travis <travis@....com>
Cc:	Yinghai Lu <yhlu.kernel@...il.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PULL]: please pull changes for tip/cpus4096


* Mike Travis <travis@....com> wrote:

> Hi Ingo,
> 
> This is the same as the previous pull request except that I added 
> Yinghai's vast improvement to probing for nr_irqs.  Big difference in 
> runtime memory allocated.

before moving on, we first need to fix all pending regressions. Such as 
some MAXSMP fallout from the cpufreq changes:

[   32.937027] calling  acpi_cpufreq_init+0x0/0x100 @ 1
[   32.942203] BUG: unable to handle kernel NULL pointer dereference at (null)
[   32.946003] IP: [<ffffffff80222521>] get_cur_val+0xcc/0x106
[   32.946003] PGD 0 
[   32.946003] Oops: 0002 [#1] SMP DEBUG_PAGEALLOC
[   32.946003] last sysfs file: 
[   32.946003] CPU 1 
[   32.946003] Pid: 1, comm: swapper Tainted: G        W  2.6.29-rc1-00190-g37a76bd #10
[   32.946003] RIP: 0010:[<ffffffff80222521>]  [<ffffffff80222521>] get_cur_val+0xcc/0x106
[   32.946003] RSP: 0018:ffff88003f977b80  EFLAGS: 00010202
[   32.946003] RAX: 0000000000000001 RBX: ffff8800029c8c80 RCX: 0000000000000008
[   32.946003] RDX: 0000000000000000 RSI: ffffffff80ce0100 RDI: 0000000000000000
[   32.946003] RBP: ffff88003f977bd0 R08: 0000000000000004 R09: 0000000000000040
[   32.946003] R10: 0000000000000060 R11: 0000000081363fa8 R12: ffffffff81c4f0e0
[   32.946003] R13: ffffffff80ce0100 R14: ffff88003c888a00 R15: 0000000000000000
[   32.946003] FS:  0000000000000000(0000) GS:ffff88003f802c00(0000) knlGS:0000000000000000
[   32.946003] CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
[   32.946003] CR2: 0000000000000000 CR3: 0000000000201000 CR4: 00000000000006e0
[   32.946003] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   32.946003] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[   32.946003] Process swapper (pid: 1, threadinfo ffff88003f976000, task ffff88003f978000)
[   32.946003] Stack:
[   32.946003]  0000000000000202 0000000000000002 0000000000000001 0000000000000000
[   32.946003]  0000000000000198 0000000000000002 0000000000000000 00000000002ca5b0
[   32.946003]  0000000000000000 ffff88003e5533e0 ffff88003f977c00 ffffffff802225e3
[   32.946003] Call Trace:
[   32.946003]  [<ffffffff802225e3>] get_cur_freq_on_cpu+0x88/0xd9
[   32.946003]  [<ffffffff80222ea9>] acpi_cpufreq_cpu_init+0x3ed/0x530
[   32.946003]  [<ffffffff80ac2d41>] cpufreq_add_dev+0x1bb/0x6dd
[   32.946003]  [<ffffffff8026fd0e>] ? trace_hardirqs_on+0xd/0xf
[   32.946003]  [<ffffffff8026fbcd>] ? trace_hardirqs_on_caller+0x1f/0x153
[   32.946003]  [<ffffffff8026fd0e>] ? trace_hardirqs_on+0xd/0xf
[   32.946003]  [<ffffffff80ccbc77>] ? mutex_lock_nested+0x2b0/0x2d3
[   32.946003]  [<ffffffff8026fbcd>] ? trace_hardirqs_on_caller+0x1f/0x153
[   32.946003]  [<ffffffff80ccbc8b>] ? mutex_lock_nested+0x2c4/0x2d3
[   32.946003]  [<ffffffff805fd81d>] ? sysdev_driver_register+0x7c/0x11a
[   32.946003]  [<ffffffff805fd81d>] ? sysdev_driver_register+0x7c/0x11a

which triggers with latest -git with the attached config, and fixed by the 
commit below..

	Ingo

-------------------->
>From 4a922a969cb0190ce4580d4b064e2ac35f3ac9bf Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@...e.hu>
Date: Tue, 13 Jan 2009 16:11:00 +0100
Subject: [PATCH] x86, cpufreq: remove leftover copymask_copy()

Impact: fix potential boot crash on MAXSMP

Remove code left over by:

  50c668d: Revert "cpumask: use work_on_cpu in acpi-cpufreq.c for drv_read

That cmd.cpumask is not allocated anymore. No impact on default !MAXSMP
kernels.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
index 6f11e02..8f3c95c 100644
--- a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
+++ b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
@@ -235,8 +235,6 @@ static u32 get_cur_val(const struct cpumask *mask)
 		return 0;
 	}
 
-	cpumask_copy(cmd.mask, mask);
-
 	drv_read(&cmd);
 
 	dprintk("get_cur_val = %u\n", cmd.val);

View attachment "config" of type "text/plain" (68528 bytes)