linux-kernel - Re: [PATCH] ia64: mca: allocate early mca with GFP

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Date:   Wed, 24 Mar 2021 11:20:45 +0100
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Sergei Trofimovich <slyfox@...too.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-ia64@...r.kernel.org
Subject: Re: [PATCH] ia64: mca: allocate early mca with GFP_ATOMIC

Hi Sergei!

On 3/23/21 6:47 PM, Sergei Trofimovich wrote:
> On Tue, 23 Mar 2021 16:15:06 +0100
> John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de> wrote:
> 
>> Hi Andrew!
>>
>> On 3/15/21 9:50 AM, Sergei Trofimovich wrote:
>>> The sleep warning happens at early boot right at
>>> secondary CPU activation bootup:
>>>
>>>     smp: Bringing up secondary CPUs ...
>>>     BUG: sleeping function called from invalid context at mm/page_alloc.c:4942
>>>     in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 0, name: swapper/1
>>>     CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.12.0-rc2-00007-g79e228d0b611-dirty #99
>>>
>>>     Call Trace:
>>>      [<a000000100014d10>] show_stack+0x90/0xc0
>>>      [<a000000101111d90>] dump_stack+0x150/0x1c0
>>>      [<a0000001000cbec0>] ___might_sleep+0x1c0/0x2a0
>>>      [<a0000001000cc040>] __might_sleep+0xa0/0x160
>>>      [<a000000100399960>] __alloc_pages_nodemask+0x1a0/0x600
>>>      [<a0000001003b71b0>] alloc_page_interleave+0x30/0x1c0
>>>      [<a0000001003b9b60>] alloc_pages_current+0x2c0/0x340
>>>      [<a00000010038c270>] __get_free_pages+0x30/0xa0
>>>      [<a000000100044730>] ia64_mca_cpu_init+0x2d0/0x3a0
>>>      [<a000000100023430>] cpu_init+0x8b0/0x1440
>>>      [<a000000100054680>] start_secondary+0x60/0x700
>>>      [<a00000010111e1d0>] start_ap+0x750/0x780
>>>     Fixed BSP b0 value from CPU 1
>>>
>>> As I understand interrupts are not enabled yet and system has a lot
>>> of memory. There is little chance to sleep and switch to GFP_ATOMIC
>>> should be a no-op.
>>>
>>> CC: Andrew Morton <akpm@...ux-foundation.org>
>>> CC: linux-ia64@...r.kernel.org
>>> Signed-off-by: Sergei Trofimovich <slyfox@...too.org>
>>> ---
>>>  arch/ia64/kernel/mca.c | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c
>>> index d4cae2fc69ca..adf6521525f4 100644
>>> --- a/arch/ia64/kernel/mca.c
>>> +++ b/arch/ia64/kernel/mca.c
>>> @@ -1824,7 +1824,7 @@ ia64_mca_cpu_init(void *cpu_data)
>>>  			data = mca_bootmem();
>>>  			first_time = 0;
>>>  		} else
>>> -			data = (void *)__get_free_pages(GFP_KERNEL,
>>> +			data = (void *)__get_free_pages(GFP_ATOMIC,
>>>  							get_order(sz));
>>>  		if (!data)
>>>  			panic("Could not allocate MCA memory for cpu %d\n",
>>>   
>>
>> Has this one been picked up for your tree already?
> 
> Should be there: https://www.ozlabs.org/~akpm/mmotm/series
> 
>> #NEXT_PATCHES_START mainline-later (next week, approximately)
>> ia64-mca-allocate-early-mca-with-gfp_atomic.patch

Great, thanks. We're still missing Valentin's patch for the NUMA enumeration issue
though. Should Valentin send the patch again with Andrew CC'ed?

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@...ian.org
`. `'   Freie Universitaet Berlin - glaubitz@...sik.fu-berlin.de
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