linux-kernel - Re: [PATCH v3 00/16] Introduce and use generic parity16/32/64 helper

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Message-ID: <7856ccb5-d848-416a-bb6c-e3bcdc03aebe@kernel.org>
Date: Fri, 7 Mar 2025 11:52:52 +0100
From: Jiri Slaby <jirislaby@...nel.org>
To: Kuan-Wei Chiu <visitorckw@...il.com>, "H. Peter Anvin" <hpa@...or.com>,
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 Yu-Chun Lin <eleanor15x@...il.com>
Subject: Re: [PATCH v3 00/16] Introduce and use generic parity16/32/64 helper

On 07. 03. 25, 10:19, Kuan-Wei Chiu wrote:
> I used to believe that casting a boolean variable to int would always
> result in 0 or 1 until a few months ago when Waiman Long explicitly
> pointed out during a review that C does not guarantee this.
> 
> So I revisited the C11 standard, which states that casting to _Bool
> always results in 0 or 1 [1]. Another section specifies that bool,
> true, and false are macros defined in <stdbool.h>, with true expanding
> to 1 and false to 0. However, these macros can be #undef and redefined
> to other values [2].

Note that we do not have/use user's stdbool.h in kernel at all. Instead, 
in linux/stddef.h, we define:
enum {
         false   = 0,
         true    = 1
};

So all is blue.

thanks,
-- 
js
suse labs