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Message-ID: <bd239f45-3c9a-5faf-ba0e-610f2383720b@arm.com>
Date: Mon, 28 Feb 2022 07:57:51 +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 8:08 PM, Dinh Nguyen wrote:
>
>
> On 2/25/22 08:29, Dinh Nguyen wrote:
>>
>>
>> On 2/25/22 02:52, Anshuman Khandual wrote:
>>>
>>>
>>> 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.
>>>
>>
>> Ok, I did not apply the whole series, just this patch.
>>
>
>
> Is someone taking this whole series or should I just take this patch?
I expect the series (latest instead) will go via the mm tree, but will
really appreciate your tags if you find the series acceptable.
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