linux-kernel - Re: [tip:WIP.x86/mm 1/1] arch/x86/kernel/process_64.c:541:35: error: '__NR_ia32

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Date:   Thu, 30 Mar 2017 12:45:51 +0300
From:   Dmitry Safonov <dsafonov@...tuozzo.com>
To:     Thomas Gleixner <tglx@...utronix.de>
CC:     kbuild test robot <fengguang.wu@...el.com>, <kbuild-all@...org>,
        <linux-kernel@...r.kernel.org>, <tipbuild@...or.com>
Subject: Re: [tip:WIP.x86/mm 1/1] arch/x86/kernel/process_64.c:541:35: error:
 '__NR_ia32_execve' undeclared

On 03/30/2017 12:31 PM, kbuild test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/mm
> head:   693bcce23a1f830d64480cad10f4004e520965fd
> commit: 693bcce23a1f830d64480cad10f4004e520965fd [1/1] x86/mm: Make in_compat_syscall() work during exec
> config: x86_64-randconfig-x012-201713 (attached as .config)
> compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
> reproduce:
>         git checkout 693bcce23a1f830d64480cad10f4004e520965fd
>         # save the attached .config to linux build tree
>         make ARCH=x86_64
>
> All errors (new ones prefixed by >>):
>
>    arch/x86/kernel/process_64.c: In function '__set_personality_ia32':
>>> arch/x86/kernel/process_64.c:541:35: error: '__NR_ia32_execve' undeclared (first use in this function)
>      task_pt_regs(current)->orig_ax = __NR_ia32_execve;
>                                       ^~~~~~~~~~~~~~~~
>    arch/x86/kernel/process_64.c:541:35: note: each undeclared identifier is reported only once for each function it appears in
>
> vim +/__NR_ia32_execve +541 arch/x86/kernel/process_64.c
>
>    535		set_thread_flag(TIF_IA32);
>    536		clear_thread_flag(TIF_X32);
>    537		if (current->mm)
>    538			current->mm->context.ia32_compat = TIF_IA32;
>    539		current->personality |= force_personality32;
>    540		/* Prepare the first "return" to user space */
>  > 541		task_pt_regs(current)->orig_ax = __NR_ia32_execve;
>    542		current->thread.status |= TS_COMPAT;
>    543	#endif
>    544	}

There was this chunk in the patch, maybe it could be done nicer,
but I didn't find the nicer way.
I checked it compilation/work with(out) ia32/x32/64-bit configs
before sending.

--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -486,6 +486,10 @@ __switch_to(struct task_struct *prev_p, struct 
task_struct *next_p)
  	return prev_p;
  }

+#define __NR_execve		59
+#define __NR_x32_execve		520
+#define __NR_ia32_execve	11
+
  void set_personality_64bit(void)