linux-kernel - Re: [PATCH] x86/mm: fix compilation error for unknown type name pgprot

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Message-ID: <d43c80a4-7e2c-fdd0-b34a-20ba07485844@nvidia.com>
Date:   Wed, 13 May 2020 12:58:38 +0530
From:   Abhishek Sahu <abhsahu@...dia.com>
To:     Logan Gunthorpe <logang@...tatee.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Ingo Molnar <mingo@...nel.org>, <x86@...nel.org>,
        Ingo Molnar <mingo@...hat.com>
CC:     Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86/mm: fix compilation error for unknown type name
 pgprot_t

On 4/27/2020 8:41 PM, Abhishek Sahu wrote:
> On 4/21/2020 11:18 AM, Abhishek Sahu wrote:
>> On 4/20/2020 10:14 PM, Logan Gunthorpe wrote:
>>> On 2020-04-20 2:22 a.m., Abhishek Sahu wrote:
>>>> commit 30796e18c299 ("x86/mm: introduce __set_memory_prot()")
>>>> added the function __set_memory_prot() which uses pgprot_t in
>>>> function prototype. The currently included header files in
>>>> <arch/x86/include/asm/set_memory.h> do not include type name
>>>> pgprot_t. The pgprot_t is defined in <asm/pgtable_types.h>.
>>>>
>>>> Fixes: 30796e18c299 ("x86/mm: introduce __set_memory_prot()")
>>>> Signed-off-by: Abhishek Sahu <abhsahu@...dia.com>
>>>
>>> I assume this is only hit with a specific driver or something that
>>> includes set_memory.h without including pgtable_types.h before hand.
>>>
>>> It certainly compiles fine for me and the kbuild robot has had lots of
>>> time to test it with random configs.
>>>
>>> Reviewed-by: Logan Gunthorpe <logang@...tatee.com>
>>
>>   Thanks Logan.
>>
>>   Yes. The mainline is compiling fine with default config.
>>   This problem is coming while compiling Out of tree NVIDIA driver.
>>   But this problem can happen for the drivers which don't include
>>   <pgtable_types.h>. I am not sure if this problem will come with
>>   some other configs. Normally, the header files should not be
>>   dependent upon the callers.
>>
> 
>  Is it possible to get this patch merged for next rc of 5.7.
>  This issue started coming from 5.7-rc1.
> 

 Could someone help in reviewing and getting this merged in the
 next rc of 5.7 version. The NVIDIA driver compilation is failing
 from 5.7-rc1. This issue can happen for any other driver also
 which is not including <asm/pgtable_types.h> in the driver.

 Thanks,
 Abhishek