linux-kernel - Re: [PATCH v4 3/5] x86/syscall: Mark exit[_group] syscall handlers _

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Date: Fri, 3 May 2024 16:48:34 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Daniel Sneddon <daniel.sneddon@...ux.intel.com>,
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alexandre Chartre <alexandre.chartre@...cle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sean Christopherson <seanjc@...gle.com>,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Nikolay Borisov <nik.borisov@...e.com>,
	KP Singh <kpsingh@...nel.org>, Waiman Long <longman@...hat.com>,
	Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v4 3/5] x86/syscall: Mark exit[_group] syscall handlers
 __noreturn

On Fri, May 03, 2024 at 04:33:00PM -0700, Paul E. McKenney wrote:
> Does arch/x86/entry/syscall_32.c need the following additional patch?
> 
> A quick smoke test passes, but perhaps I am just getting lucky...
> 
> 							Thanx, Paul
> 
> ------------------------------------------------------------------------
> 
> diff --git a/arch/x86/entry/syscall_32.c b/arch/x86/entry/syscall_32.c
> index aab31760b4e3e..d9ae910ea6f33 100644
> --- a/arch/x86/entry/syscall_32.c
> +++ b/arch/x86/entry/syscall_32.c
> @@ -14,9 +14,13 @@
>  #endif
>  
>  #define __SYSCALL(nr, sym) extern long __ia32_##sym(const struct pt_regs *);
> +#define __SYSCALL_NORETURN(nr, sym) extern long __noreturn __ia32_##sym(const struct pt_regs *);
>  #include <asm/syscalls_32.h>
>  #undef __SYSCALL
>  
> +#undef __SYSCALL_NORETURN
> +#define __SYSCALL_NORETURN __SYSCALL
> +
>  #define __SYSCALL(nr, sym) __ia32_##sym,
>  const sys_call_ptr_t ia32_sys_call_table[] = {
>  #include <asm/syscalls_32.h>

Ah, yeah, that looks right.

-- 
Josh