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Message-ID: <637cfc45-60ad-3cd1-5127-76ecabb87def@arm.com>
Date: Fri, 25 Feb 2022 14:22:03 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: Dinh Nguyen <dinguyen@...nel.org>, linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org,
Christoph Hellwig <hch@...radead.org>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-arch@...r.kernel.org
Subject: Re: [PATCH 25/30] nios2/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT
On 2/25/22 7:01 AM, Dinh Nguyen wrote:
> Hi Anshuman,
>
> On 2/13/22 20:30, Anshuman Khandual wrote:
>> This defines and exports a platform specific custom vm_get_page_prot() via
>> subscribing ARCH_HAS_VM_GET_PAGE_PROT. Subsequently all __SXXX and __PXXX
>> macros can be dropped which are no longer needed.
>>
>> Cc: Dinh Nguyen <dinguyen@...nel.org>
>> Cc: linux-kernel@...r.kernel.org
>> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
>> Acked-by: Dinh Nguyen <dinguyen@...nel.org>
>> ---
>> arch/nios2/Kconfig | 1 +
>> arch/nios2/include/asm/pgtable.h | 16 ------------
>> arch/nios2/mm/init.c | 45 ++++++++++++++++++++++++++++++++
>> 3 files changed, 46 insertions(+), 16 deletions(-)
>>
>> diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig
>> index 33fd06f5fa41..85a58a357a3b 100644
>> --- a/arch/nios2/Kconfig
>> +++ b/arch/nios2/Kconfig
>> @@ -6,6 +6,7 @@ config NIOS2
>> select ARCH_HAS_SYNC_DMA_FOR_CPU
>> select ARCH_HAS_SYNC_DMA_FOR_DEVICE
>> select ARCH_HAS_DMA_SET_UNCACHED
>> + select ARCH_HAS_VM_GET_PAGE_PROT
>> select ARCH_NO_SWAP
>> select COMMON_CLK
>> select TIMER_OF
>> diff --git a/arch/nios2/include/asm/pgtable.h b/arch/nios2/include/asm/pgtable.h
>> index 4a995fa628ee..2678dad58a63 100644
>> --- a/arch/nios2/include/asm/pgtable.h
>> +++ b/arch/nios2/include/asm/pgtable.h
>> @@ -40,24 +40,8 @@ struct mm_struct;
>> */
>> /* Remove W bit on private pages for COW support */
>> -#define __P000 MKP(0, 0, 0)
>> -#define __P001 MKP(0, 0, 1)
>> -#define __P010 MKP(0, 0, 0) /* COW */
>> -#define __P011 MKP(0, 0, 1) /* COW */
>> -#define __P100 MKP(1, 0, 0)
>> -#define __P101 MKP(1, 0, 1)
>> -#define __P110 MKP(1, 0, 0) /* COW */
>> -#define __P111 MKP(1, 0, 1) /* COW */
>> /* Shared pages can have exact HW mapping */
>> -#define __S000 MKP(0, 0, 0)
>> -#define __S001 MKP(0, 0, 1)
>> -#define __S010 MKP(0, 1, 0)
>> -#define __S011 MKP(0, 1, 1)
>> -#define __S100 MKP(1, 0, 0)
>> -#define __S101 MKP(1, 0, 1)
>> -#define __S110 MKP(1, 1, 0)
>> -#define __S111 MKP(1, 1, 1)
>> /* Used all over the kernel */
>> #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHED | _PAGE_READ | \
>> diff --git a/arch/nios2/mm/init.c b/arch/nios2/mm/init.c
>> index 613fcaa5988a..311b2146a248 100644
>> --- a/arch/nios2/mm/init.c
>> +++ b/arch/nios2/mm/init.c
>> @@ -124,3 +124,48 @@ const char *arch_vma_name(struct vm_area_struct *vma)
>> {
>> return (vma->vm_start == KUSER_BASE) ? "[kuser]" : NULL;
>> }
>> +
>> +pgprot_t vm_get_page_prot(unsigned long vm_flags)
>> +{
>> + switch (vm_flags & (VM_READ | VM_WRITE | VM_EXEC | VM_SHARED)) {
>> + case VM_NONE:
>> + return MKP(0, 0, 0);
>> + case VM_READ:
>> + return MKP(0, 0, 1);
>> + /* COW */
>> + case VM_WRITE:
>> + return MKP(0, 0, 0);
>> + /* COW */
>> + case VM_WRITE | VM_READ:
>> + return MKP(0, 0, 1);
>> + case VM_EXEC:
>> + return MKP(1, 0, 0);
>> + case VM_EXEC | VM_READ:
>> + return MKP(1, 0, 1);
>> + /* COW */
>> + case VM_EXEC | VM_WRITE:
>> + return MKP(1, 0, 0);
>> + /* COW */
>> + case VM_EXEC | VM_WRITE | VM_READ:
>> + return MKP(1, 0, 1);
>> + case VM_SHARED:
>> + return MKP(0, 0, 0);
>> + case VM_SHARED | VM_READ:
>> + return MKP(0, 0, 1);
>> + case VM_SHARED | VM_WRITE:
>> + return MKP(0, 1, 0);
>> + case VM_SHARED | VM_WRITE | VM_READ:
>> + return MKP(0, 1, 1);
>> + case VM_SHARED | VM_EXEC:
>> + return MKP(1, 0, 0);
>> + case VM_SHARED | VM_EXEC | VM_READ:
>> + return MKP(1, 0, 1);
>> + case VM_SHARED | VM_EXEC | VM_WRITE:
>> + return MKP(1, 1, 0);
>> + case VM_SHARED | VM_EXEC | VM_WRITE | VM_READ:
>> + return MKP(1, 1, 1);
>> + default:
>> + BUILD_BUG();
>> + }
>> +}
>> +EXPORT_SYMBOL(vm_get_page_prot);
>
> I'm getting this compile error after applying this patch when build NIOS2:
Hmm, that is strange.
Did you apply the entire series or atleast upto the nios2 patch ? Generic
vm_get_page_prot() should not be called (which is build complaining here)
when ARCH_HAS_VM_GET_PAGE_PROT is already enabled on nios2 platform.
Ran a quick build test on nios2 for the entire series and also just upto
this particular patch, build was successful.
>
>
> mm/mmap.c:105:2: error: ‘__P000’ undeclared here (not in a function)
>
> 105 | __P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111,
>
> | ^~~~~~
>
> mm/mmap.c:105:10: error: ‘__P001’ undeclared here (not in a function)
>
> 105 | __P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111,
>
> | ^~~~~~
>
> mm/mmap.c:105:18: error: ‘__P010’ undeclared here (not in a function)
>
> 105 | __P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111,
>
> | ^~~~~~
>
> AR fs/devpts/built-in.a
>
> mm/mmap.c:105:26: error: ‘__P011’ undeclared here (not in a function)
>
> 105 | __P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111,
>
> | ^~~~~~
>
> mm/mmap.c:105:34: error: ‘__P100’ undeclared here (not in a function)
>
> 105 | __P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111,
>
> | ^~~~~~
>
> mm/mmap.c:105:42: error: ‘__P101’ undeclared here (not in a function)
>
> 105 | __P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111,
>
> | ^~~~~~
>
> mm/mmap.c:105:50: error: ‘__P110’ undeclared here (not in a function)
>
> 105 | __P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111,
>
> | ^~~~~~
>
> mm/mmap.c:105:58: error: ‘__P111’ undeclared here (not in a function)
>
> 105 | __P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111,
>
> | ^~~~~~
>
> mm/mmap.c:106:2: error: ‘__S000’ undeclared here (not in a function)
>
> 106 | __S000, __S001, __S010, __S011, __S100, __S101, __S110, __S111
>
> | ^~~~~~
>
> mm/mmap.c:106:10: error: ‘__S001’ undeclared here (not in a function)
>
> 106 | __S000, __S001, __S010, __S011, __S100, __S101, __S110, __S111
>
>
>
> Dinh
>
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