linux-kernel - Re: [PATCH 08/18] arm64: convert raw syscall invocation to C

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Message-ID: <20180514202445.GA26773@light.dominikbrodowski.net>
Date:   Mon, 14 May 2018 22:24:45 +0200
From:   Dominik Brodowski <linux@...inikbrodowski.net>
To:     Mark Rutland <mark.rutland@....com>,
        Dave Martin <Dave.Martin@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, marc.zyngier@....com,
        catalin.marinas@....com, will.deacon@....com,
        linux-kernel@...r.kernel.org, james.morse@....com,
        viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 08/18] arm64: convert raw syscall invocation to C

On Mon, May 14, 2018 at 12:41:10PM +0100, Mark Rutland wrote:
> I agree it would be nicer if it had a wrapper that took a pt_regs, even
> if it does nothing with it.
> 
> We can't use SYSCALL_DEFINE0() due to the fault injection muck, we'd
> need a ksys_ni_syscall() for our traps.c logic, and adding this
> uniformly would involve some arch-specific rework for x86, too, so I
> decided it was not worth the effort.

Couldn't you just open-code the "return -ENOSYS;" in traps.c? Error
injection has no reasonable stable ABI/API expectations, so that's not a
show-stopper either.

Thanks,
	Dominik