linux-kernel - Re: [PATCH] ARM: uaccess: Add missing include for set_thread

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Message-ID: <CANwerB2eXA7Jkne504pik5MF4QFkQe0JURjmS0Ux0isauheqyg@mail.gmail.com>
Date:   Thu, 21 Sep 2017 08:03:36 +1000
From:   Jonathan Liu <net147@...il.com>
To:     Thomas Garnier <thgarnie@...gle.com>
Cc:     Russell King <linux@...linux.org.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: uaccess: Add missing include for set_thread_flag

Hi Thomas,

On 21 September 2017 at 02:31, Thomas Garnier <thgarnie@...gle.com> wrote:
> On Tue, Sep 19, 2017 at 2:35 PM, Jonathan Liu <net147@...il.com> wrote:
>>
>> Hi Thomas,
>>
>> The top of the C source file I am compiling has:
>> #include <linux/kernel.h>
>> #include <asm/uaccess.h>
>>
>> Tracing through the asm/uaccess.h include I see
>> asm/uaccess.h -> asm/domain.h -> asm/thread_info.h
>>
>> but set_thread_info is defined in linux/thread_info.h not
>> asm/thread_info.h (see
>> http://elixir.free-electrons.com/linux/v4.14-rc1/ident/set_thread_flag).
>
> I see, I think I could not reproduce this issue because I already
> reverted the original commit in favor of a different approach on
> linux-next (see commit 2404269bc4e77a67875c8db6667be34c9913c96e).
>
> Let me know if this commit resolve the issue and thanks for reaching out.
>

Cherry-picking commit 2404269bc4e77a67875c8db6667be34c9913c96e on top
of 4.14-rc1 resolves the issue.
Thanks.

>>
>> Regards,
>> Jonathan
>>
>> On 20 September 2017 at 00:32, Thomas Garnier <thgarnie@...gle.com> wrote:
>> > On Tue, Sep 19, 2017 at 4:50 AM, Jonathan Liu <net147@...il.com> wrote:
>> >> Fixes "implicit declaration of function" compile error for out-of-tree
>> >> kernel modules including asm/uaccess.h.
>> >
>> > I failed to reproduce this issue by creating an out of tree module
>> > with a separate file (with only uaccess.h). Are you using a special
>> > config?
>> >
>> > Looking at the headers on uaccess.h. You get thread_info through:
>> >
>> >  asm/domain.h -> asm/thread_info.h
>> >
>> >>
>> >> Fixes: 73ac5d6a2b6a ("arm/syscalls: Check address limit on user-mode return")
>> >> Signed-off-by: Jonathan Liu <net147@...il.com>
>> >> ---
>> >>  arch/arm/include/asm/uaccess.h | 1 +
>> >>  1 file changed, 1 insertion(+)
>> >>
>> >> diff --git a/arch/arm/include/asm/uaccess.h b/arch/arm/include/asm/uaccess.h
>> >> index 87936dd5d151..13d1877ffb75 100644
>> >> --- a/arch/arm/include/asm/uaccess.h
>> >> +++ b/arch/arm/include/asm/uaccess.h
>> >> @@ -17,6 +17,7 @@
>> >>  #include <asm/unified.h>
>> >>  #include <asm/compiler.h>
>> >>
>> >> +#include <linux/thread_info.h>
>> >>  #include <asm/extable.h>
>> >>
>> >>  /*
>> >> --
>> >> 2.13.2
>> >>
>> >
>> >
>> >
>> > --
>> > Thomas
>
>
>
>
> --
> Thomas

Regards,
Jonathan