linux-kernel - Re: [PATCH] maple_tree: Use correct variable type in sizeof

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Message-ID: <ZDQUdK/hht5I9/p7@casper.infradead.org>
Date:   Mon, 10 Apr 2023 14:51:48 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Peng Zhang <zhangpeng.00@...edance.com>
Cc:     Gang Li <ligang.bdlg@...edance.com>, akpm@...ux-foundation.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        maple-tree@...ts.infradead.org,
        David Binderman <dcb314@...mail.com>
Subject: Re: [PATCH] maple_tree: Use correct variable type in sizeof

On Mon, Apr 10, 2023 at 06:09:27PM +0800, Peng Zhang wrote:
> Maybe sizeof(void *) is equal to sizeof(unsigned long)
> in most architectures, so I don't know if it counts as a fix.

This is actually required inside the Linux kernel.  The only programming
model I know where sizeof(void *) != sizeof(unsigned long) is Windows
64-bit userspace.