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

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Date:   Mon, 27 Apr 2020 20:41:53 +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@...hat.com>, <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 4/21/2020 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.

 Thanks,
 Abhishek