linux-kernel - Re: [PATCH 01/13] seqnum_ops: Introduce Sequence Number Ops

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Message-ID: <20201117122750.GH3121406@hirez.programming.kicks-ass.net>
Date:   Tue, 17 Nov 2020 13:27:50 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Greg KH <gregkh@...uxfoundation.org>, corbet@....net,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/13] seqnum_ops: Introduce Sequence Number Ops

On Thu, Nov 12, 2020 at 02:27:49PM -0700, Shuah Khan wrote:

> atomic64_t depends on CONFIG_64BIT
> 
> include/linux/types.h
> 
> #ifdef CONFIG_64BIT
> typedef struct {
>         s64 counter;
> } atomic64_t;
> #endif

That's because some 32bit archs need to override the type definition.
atomic64_t is available on 32bit, although sometimes it is atrocious
crap.