linux-kernel - Re: [PATCH v7 2/6] syscall.h: add syscall_set

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Message-ID: <20250409155207.GA1506425@ax162>
Date: Wed, 9 Apr 2025 08:52:07 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: "Dmitry V. Levin" <ldv@...ace.io>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Charlie Jenkins <charlie@...osinc.com>,
	Arnd Bergmann <arnd@...db.de>, strace-devel@...ts.strace.io,
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v7 2/6] syscall.h: add syscall_set_arguments()

On Wed, Apr 09, 2025 at 09:40:18AM +0300, Dmitry V. Levin wrote:
> On Tue, Apr 08, 2025 at 05:38:03PM -0700, Nathan Chancellor wrote:
> > diff --git a/arch/riscv/include/asm/syscall.h b/arch/riscv/include/asm/syscall.h
> > index a5281cdf2b10..34313387f977 100644
> > --- a/arch/riscv/include/asm/syscall.h
> > +++ b/arch/riscv/include/asm/syscall.h
> > @@ -69,8 +69,11 @@ static inline void syscall_get_arguments(struct task_struct *task,
> >  					 unsigned long *args)
> >  {
> >  	args[0] = regs->orig_a0;
> > -	args++;
> > -	memcpy(args, &regs->a1, 5 * sizeof(args[0]));
> > +	args[1] = regs->a1;
> > +	args[2] = regs->a2;
> > +	args[3] = regs->a3;
> > +	args[4] = regs->a4;
> > +	args[5] = regs->a5;
> >  }
> >  
> >  static inline void syscall_set_arguments(struct task_struct *task,
> > @@ -78,8 +81,11 @@ static inline void syscall_set_arguments(struct task_struct *task,
> >  					 const unsigned long *args)
> >  {
> >  	regs->orig_a0 = args[0];
> > -	args++;
> > -	memcpy(&regs->a1, args, 5 * sizeof(regs->a1));
> > +	regs->a1 = args[1];
> > +	regs->a2 = args[2];
> > +	regs->a3 = args[3];
> > +	regs->a4 = args[4];
> > +	regs->a5 = args[5];
> >  }
> >  
> >  static inline int syscall_get_arch(struct task_struct *task)
> 
> Looks good, thanks.  How do we proceed from this point?

I can send a standalone patch for syscall_get_arguments() since that is
an issue present before your series then Andrew could fold in the same
change for syscall_set_arguments() into your change that introduces it
so there is no bisect problem?

Cheers,
Nathan