linux-kernel - Re: [PATCH v2 1/7] powerpc: properly negate error in syscall_set_return

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Message-ID: <20250127112023.GB29522@strace.io>
Date: Mon, 27 Jan 2025 13:20:23 +0200
From: "Dmitry V. Levin" <ldv@...ace.io>
To: Christophe Leroy <christophe.leroy@...roup.eu>
Cc: Alexey Gladkov <legion@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Eugene Syromyatnikov <evgsyr@...il.com>,
	Mike Frysinger <vapier@...too.org>,
	Renzo Davoli <renzo@...unibo.it>,
	Davide Berardi <berardi.dav@...il.com>,
	strace-devel@...ts.strace.io,
	Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Nicholas Piggin <npiggin@...il.com>,
	Naveen N Rao <naveen@...nel.org>, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/7] powerpc: properly negate error in
 syscall_set_return_value()

On Thu, Jan 23, 2025 at 11:07:21PM +0100, Christophe Leroy wrote:
[...]
> To add a bit more to the confusion,

Looks like there is no end to it:

static inline long regs_return_value(struct pt_regs *regs)
{
        if (trap_is_scv(regs))
                return regs->gpr[3];

        if (is_syscall_success(regs))
                return regs->gpr[3];
        else
                return -regs->gpr[3];
}

static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
{
        regs->gpr[3] = rc;
}

This doesn't look consistent, does it?


-- 
ldv