Re: Kernel 4.7: PAGE_GUARDED and _PAGE_NO_CACHE

[Christian Zigotzky <chzigotzky@xenosoft.de>]

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Hi All,

Can I disable the new PowerPC features with

Radix MMU Support (PPC_RADIX_MMU) [Y/n/?] (NEW) -> n

?????

I can't compile the RC3 without the PowerPC commits. Our kernel lost the mainline kernel support. Revert of the three PowerPC commits works but the kernel doesn't compile anymore.

Cheers,

Christian

Sent from my iPhone

> On 09 Jun 2016, at 14:13, Christian Zigotzky <chzigotzky@xenosoft.de> wrote:
> 
> Michael,
> 
> Thank you for your patch. I was able to compile the kernel but unfortunately it doesn't boot.
> 
> Do you have another hint or patch for me?
> 
> Thanks in advance,
> 
> Christian
> 
>> On 09 June 2016 at 1:15 PM, Michael Ellerman wrote:
>>> On Thu, 2016-06-09 at 10:48 +0200, Christian Zigotzky wrote:
>>> 
>>> Shall I modify the workaround? Is the workaround for lack of the device
>>> tree the problem?
>> I don't think so.
>> 
>> You could try this patch to try and isolate it:
>> 
>> diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
>> index 88a5ecaa157b..ae2f2705e8a0 100644
>> --- a/arch/powerpc/include/asm/book3s/64/pgtable.h
>> +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
>> @@ -251,7 +251,7 @@ extern unsigned long ioremap_bot;
>>   *  PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces
>>   * IOREMAP_BASE = ISA_IO_BASE + 2G to VMALLOC_START + PGTABLE_RANGE
>>   */
>> -#define KERN_IO_START    (KERN_VIRT_START + (KERN_VIRT_SIZE >> 1))
>> +#define KERN_IO_START    (H_KERN_VIRT_START + (H_KERN_VIRT_SIZE >> 1))
>>  #define FULL_IO_SIZE    0x80000000ul
>>  #define  ISA_IO_BASE    (KERN_IO_START)
>>  #define  ISA_IO_END    (KERN_IO_START + 0x10000ul)
>> 
>> 
>> cheers
> 

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