linux-kernel - Re: [PATCH v3 1/9] livepatch: Create and include UAPI headers

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Date:   Thu, 11 Apr 2019 10:30:45 -0400
From:   Joe Lawrence <joe.lawrence@...hat.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        live-patching@...r.kernel.org,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Jessica Yu <jeyu@...nel.org>, Jiri Kosina <jikos@...nel.org>,
        Joao Moreira <jmoreira@...e.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        Michael Matz <matz@...e.de>, Miroslav Benes <mbenes@...e.cz>,
        Nicolai Stange <nstange@...e.de>,
        Petr Mladek <pmladek@...e.com>
Subject: Re: [PATCH v3 1/9] livepatch: Create and include UAPI headers

On 4/10/19 8:32 PM, Masahiro Yamada wrote:
> On Thu, Apr 11, 2019 at 12:52 AM Joe Lawrence <joe.lawrence@...hat.com> wrote:
>>
>> From: Josh Poimboeuf <jpoimboe@...hat.com>
>>
>> Define klp prefixes in include/uapi/linux/livepatch.h, and use them for
>> replacing hard-coded values in kernel/livepatch/core.c.
>>
>> [ ... snip ... ]
 >>
>> diff --git a/include/uapi/linux/livepatch.h b/include/uapi/linux/livepatch.h
>> new file mode 100644
>> index 000000000000..bb86243de805
>> --- /dev/null
>> +++ b/include/uapi/linux/livepatch.h
>> @@ -0,0 +1,17 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
> 
> 
> In my understanding, UAPI headers should be licensed under:
> 
> /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> 
> 

Good eye, that is an interesting licensing detail.  Easy enough to 
update assuming Josh (original author) is fine with adding the modifier.

>> +
>> +/*
>> + * livepatch.h - Kernel Live Patching Core
>> + *
>> + * Copyright (C) 2016 Josh Poimboeuf <jpoimboe@...hat.com>
>> + */
>> +
>> +#ifndef _UAPI_LIVEPATCH_H
>> +#define _UAPI_LIVEPATCH_H
>> +
>> +#include <linux/types.h>
> 
> 
> Why is this include needed?
> 
>> +#define KLP_RELA_PREFIX                ".klp.rela."
>> +#define KLP_SYM_PREFIX         ".klp.sym."
> 
> These do not depend on <linux/types.h>
> 

Hmmm, types.h has been included since v1, but I just verified that 
removing it results in a clean build, so you are correct that it is 
(now) unnecessary.

Thanks,

-- Joe