linux-kernel - Re: [PATCH] x86: always use SYSCALL

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Date:   Tue, 13 Mar 2018 14:16:01 -0700
From:   Jann Horn <jannh@...gle.com>
To:     "Tautschnig, Michael" <tautschn@...zon.co.uk>
Cc:     "x86@...nel.org" <x86@...nel.org>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Jaswinder Singh <jaswinder@...radead.org>,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] x86: always use SYSCALL_DEFINE*

On Sat, Mar 10, 2018 at 12:55 PM, Tautschnig, Michael
<tautschn@...zon.co.uk> wrote:
> All syscall arguments are passed in as types of the same byte size as
> unsigned long (width of full registers). Using a smaller type without a
> cast may result in losing bits of information. SYSCALL_DEFINE* introduce
> adequate type casts. All definitions of syscalls in x86 except for those
> patched here have already been using the appropriate SYSCALL_DEFINE*.
[...]
> diff --git a/arch/x86/kernel/ioport.c b/arch/x86/kernel/ioport.c
> index 2f72330..d98b2a3 100644
> --- a/arch/x86/kernel/ioport.c
> +++ b/arch/x86/kernel/ioport.c
> @@ -23,7 +23,8 @@
>  /*
>   * this changes the io permissions bitmap in the current task.
>   */
> -asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
> +SYSCALL_DEFINE3(sys_ioperm, unsigned long, from, unsigned long, num, int,
> +               turn_on)

Shouldn't this be "SYSCALL_DEFINE3(ioperm, [...]", without the "sys_"?