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

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Date:	Tue, 26 May 2015 09:32:43 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Minfei Huang <mnfhuang@...il.com>, Li Bin <huawei.libin@...wei.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

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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.

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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