linux-kernel - Re: Linux 6.1-rc3 build fail in include/linux/bpf.h

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Message-ID: <Y1+8zIdf8mgQXwHg@krava>
Date:   Mon, 31 Oct 2022 13:17:16 +0100
From:   Jiri Olsa <olsajiri@...il.com>
To:     David Laight <David.Laight@...lab.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: Linux 6.1-rc3 build fail in include/linux/bpf.h

On Mon, Oct 31, 2022 at 11:14:31AM +0000, David Laight wrote:
> The 6.1-rc3 sources fail to build because bpf.h unconditionally
> #define BPF_DISPATCHER_ATTRIBUTES __attribute__((patchable_function_entry(5)))
> for X86_64 builds.
> 
> I'm pretty sure that should depend on some other options
> since the compiler isn't required to support it.
> (The gcc 7.5.0 on my Ubunti 18.04 system certainly doesn't)
> 
> The only other reference to that attribute is in the definition
> of 'notrace' in compiler.h.

I guess we need to make some __has_attribute check and make all that conditional

cc-ing Peter

jirka

> 
> 	David
> 
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