linux-kernel - Re: [PATCH] alpha: Wire up missing syscalls

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Message-ID: <20150512142942.GA12264@codemonkey.org.uk>
Date:	Tue, 12 May 2015 10:29:42 -0400
From:	Dave Jones <davej@...emonkey.org.uk>
To:	Michael Cree <mcree@...on.net.nz>,
	Chen Gang <xili_gchen_5257@...mail.com>, rth@...ddle.net,
	ink@...assic.park.msu.ru,
	"mattst88@...il.com" <mattst88@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-alpha@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] alpha: Wire up missing syscalls

On Tue, May 12, 2015 at 08:59:52PM +1200, Michael Cree wrote:
 > On Sun, May 10, 2015 at 02:33:36AM +0800, Chen Gang wrote:
 > > The related warnings:
 > > 
 > >     CALL    scripts/checksyscalls.sh
 > >   <stdin>:1238:2: warning: #warning syscall seccomp not implemented [-Wcpp]
 > >   <stdin>:1241:2: warning: #warning syscall getrandom not implemented [-Wcpp]
 > >   <stdin>:1244:2: warning: #warning syscall memfd_create not implemented [-Wcpp]
 > >   <stdin>:1247:2: warning: #warning syscall bpf not implemented [-Wcpp]
 > >   <stdin>:1250:2: warning: #warning syscall execveat not implemented [-Wcpp]
 > 
 > Chen: Have you tested the syscalls you have wired up?
 > 
 > I have a suspicion that more is required to wire up the seccomp
 > syscall.

likewise sys_bpf judging by the absence of bpf_int_jit_compile and friends in arch/alpha
The weak symbols mean it probably compiles/links, but it doesn't actually do
anything, and now instead of -ENOSYS, anyone trying to actually use that syscall
on alpha will get weird results.

Shutting up warnings like this strikes me as the wrong thing to do.

	Dave

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