linux-kernel - Re: [PATCH] livepatch: match function return value type with prototype

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Message-ID: <5566AEB2.3090503@huawei.com>
Date:	Thu, 28 May 2015 13:59:14 +0800
From:	Li Bin <huawei.libin@...wei.com>
To:	Jiri Slaby <jslaby@...e.cz>, Minfei Huang <mnfhuang@...il.com>
CC:	Jiri Kosina <jkosina@...e.cz>,
	Nicholas Mc Guire <hofrat@...dl.org>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Seth Jennings <sjenning@...hat.com>,
	Vojtech Pavlik <vojtech@...e.cz>,
	"live-patching@...r.kernel.org" <live-patching@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	xiexiuqi <xiexiuqi@...wei.com>,
	Hanjun Guo <guohanjun@...wei.com>,
	"mhuang@...hat.com" <mhuang@...hat.com>
Subject: Re: [PATCH] livepatch: match function return value type with prototype

On 2015/5/26 15:32, Jiri Slaby wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
> 
> On 05/26/2015, 06:46 AM, Minfei Huang wrote:
>> On Tue, May 26, 2015 at 10:44 AM, Li Bin <huawei.libin@...wei.com>
>> wrote:
>>> The klp_is_module return type should be boolean.
>>>
>>> Signed-off-by: Li Bin <huawei.libin@...wei.com> --- 
>>> kernel/livepatch/core.c |    2 +- 1 files changed, 1
>>> insertions(+), 1 deletions(-)
>>>
>>> diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c 
>>> index 284e269..30e9339 100644 --- a/kernel/livepatch/core.c +++
>>> b/kernel/livepatch/core.c @@ -78,7 +78,7 @@ static struct klp_ops
>>> *klp_find_ops(unsigned long old_addr)
>>>
>>> static bool klp_is_module(struct klp_object *obj) { -
>>> return obj->name; +       return !!obj->name; }
>>
>> Hi, Bin.
>>
>> Does compile blame the prototype before you convert it? If not, I
>> think we do not need to fix it, since there are a lot of places in
>> kernel where we return point value as boolean.
> 
> Yes, but the real reason is not that we use it on a lot of places, but
> that it is standardized in ¶ 6.3.1.2:
> When any scalar value is converted to _Bool, the result is 0 if the
> value compares equal to 0; otherwise, the result is 1.
> 

OK, I see, thank you!
	Li Bin

> Along with the definition of scalar types:
> Arithmetic types and pointer types are collectively called scalar types.
> 
> thanks,
> - -- 
> js
> suse labs
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