linux-kernel - Re: [PATCH v9 17/28] x86/asm: Use SYM_INNER

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Message-ID: <20191015173124.GF596@zn.tnic>
Date:   Tue, 15 Oct 2019 19:31:25 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Jiri Slaby <jslaby@...e.cz>
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        x86@...nel.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org, Andy Lutomirski <luto@...capital.net>
Subject: Re: [PATCH v9 17/28] x86/asm: Use SYM_INNER_LABEL instead of GLOBAL

On Fri, Oct 11, 2019 at 01:50:57PM +0200, Jiri Slaby wrote:
> The GLOBAL macro had several meanings and is going away. In this patch,
> convert all the inner function labels marked with GLOBAL to use
> SYM_INNER_LABEL instead.
> 
> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: x86@...nel.org
> Cc: Andy Lutomirski <luto@...capital.net>
> ---
>  arch/x86/entry/entry_64.S                |  6 +++---
>  arch/x86/entry/entry_64_compat.S         |  4 ++--
>  arch/x86/entry/vdso/vdso32/system_call.S |  2 +-
>  arch/x86/kernel/ftrace_32.S              |  2 +-
>  arch/x86/kernel/ftrace_64.S              | 16 ++++++++--------
>  arch/x86/realmode/rm/reboot.S            |  2 +-
>  6 files changed, 16 insertions(+), 16 deletions(-)
> 
> diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
> index 607e25f54ff4..57d246048ac6 100644
> --- a/arch/x86/entry/entry_64.S
> +++ b/arch/x86/entry/entry_64.S
> @@ -162,7 +162,7 @@ ENTRY(entry_SYSCALL_64)
>  	pushq	%r11					/* pt_regs->flags */
>  	pushq	$__USER_CS				/* pt_regs->cs */
>  	pushq	%rcx					/* pt_regs->ip */
> -GLOBAL(entry_SYSCALL_64_after_hwframe)
> +SYM_INNER_LABEL(entry_SYSCALL_64_after_hwframe, SYM_L_GLOBAL)
>  	pushq	%rax					/* pt_regs->orig_ax */
>  
>  	PUSH_AND_CLEAR_REGS rax=$-ENOSYS
> @@ -621,7 +621,7 @@ ret_from_intr:
>  	call	prepare_exit_to_usermode
>  	TRACE_IRQS_IRETQ
>  
> -GLOBAL(swapgs_restore_regs_and_return_to_usermode)
> +SYM_INNER_LABEL(swapgs_restore_regs_and_return_to_usermode, SYM_L_GLOBAL)
>  #ifdef CONFIG_DEBUG_ENTRY
>  	/* Assert that pt_regs indicates user mode. */
>  	testb	$3, CS(%rsp)
> @@ -679,7 +679,7 @@ retint_kernel:
>  	 */
>  	TRACE_IRQS_IRETQ
>  
> -GLOBAL(restore_regs_and_return_to_kernel)
> +SYM_INNER_LABEL(restore_regs_and_return_to_kernel, SYM_L_GLOBAL)
>  #ifdef CONFIG_DEBUG_ENTRY
>  	/* Assert that pt_regs indicates kernel mode. */
>  	testb	$3, CS(%rsp)

Do this too, while at it?

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 57d246048ac6..e73369858556 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -247,7 +247,7 @@ SYM_INNER_LABEL(entry_SYSCALL_64_after_hwframe, SYM_L_GLOBAL)
 	 * We win! This label is here just for ease of understanding
 	 * perf profiles. Nothing jumps here.
 	 */
-syscall_return_via_sysret:
+SYM_INNER_LABEL(syscall_return_via_sysret, SYM_L_GLOBAL)
 	/* rcx and r11 are already restored (see code above) */
 	UNWIND_HINT_EMPTY
 	POP_REGS pop_rdi=0 skip_r11rcx=1

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette