linux-kernel - Re: [PATCH 4.4 01/58] parisc: Increase thread and stack size to 32kb

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Date:   Fri, 11 Aug 2017 09:21:15 +0200
From:   Helge Deller <deller@....de>
To:     Ben Hutchings <ben.hutchings@...ethink.co.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 4.4 01/58] parisc: Increase thread and stack size to 32kb

On 11.08.2017 03:33, Ben Hutchings wrote:
> On Wed, 2017-08-09 at 12:41 -0700, Greg Kroah-Hartman wrote:
>> 4.4-stable review patch.  If anyone has any objections, please let me know.
>>
>> ------------------
>>
>> From: Helge Deller <deller@....de>
>>
>> commit 8f8201dfed91a43ac38c899c82f81eef3d36afd9 upstream.
>>
>> Since kernel 4.11 the thread and irq stacks on parisc randomly overflow
>> the default size of 16k. The reason why stack usage suddenly grew is yet
>> unknown.
> 
> So we don't need this for 4.4.

Correct.

I had Cc: stable@...r.kernel.org # 4.11+
in the commit itself:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8f8201dfed91a43ac38c899c82f81eef3d36afd9

Helge

> 
> Ben.
> 
>> Signed-off-by: Helge Deller <deller@....de>
>> Signed-off-by: Helge Deller <deller@....de>
>> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>>
>> ---
>>  arch/parisc/include/asm/thread_info.h |    2 +-
>>  arch/parisc/kernel/irq.c              |    2 +-
>>  2 files changed, 2 insertions(+), 2 deletions(-)
>>
>> --- a/arch/parisc/include/asm/thread_info.h
>> +++ b/arch/parisc/include/asm/thread_info.h
>> @@ -34,7 +34,7 @@ struct thread_info {
>>  
>>  /* thread information allocation */
>>  
>> -#define THREAD_SIZE_ORDER	2 /* PA-RISC requires at least 16k stack */
>> +#define THREAD_SIZE_ORDER	3 /* PA-RISC requires at least 32k stack */
>>  /* Be sure to hunt all references to this down when you change the size of
>>   * the kernel stack */
>>  #define THREAD_SIZE             (PAGE_SIZE << THREAD_SIZE_ORDER)
>> --- a/arch/parisc/kernel/irq.c
>> +++ b/arch/parisc/kernel/irq.c
>> @@ -380,7 +380,7 @@ static inline int eirr_to_irq(unsigned l
>>  /*
>>   * IRQ STACK - used for irq handler
>>   */
>> -#define IRQ_STACK_SIZE      (4096 << 2) /* 16k irq stack size */
>> +#define IRQ_STACK_SIZE      (4096 << 3) /* 32k irq stack size */
>>  
>>  union irq_stack_union {
>>  	unsigned long stack[IRQ_STACK_SIZE/sizeof(unsigned long)];
>>
>>
>