linux-kernel - [tip:x86/asm] x86/entry/64: Use ENTRY() instead of ALIGN+GLOBAL for stub32

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Message-ID: <tip-499934898fcd15e4337dc858be6c09cd9fd74e85@git.kernel.org>
Date:   Tue, 29 Aug 2017 06:05:47 -0700
From:   tip-bot for Jiri Slaby <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     peterz@...radead.org, luto@...nel.org, jpoimboe@...hat.com,
        hpa@...or.com, jslaby@...e.cz, torvalds@...ux-foundation.org,
        tglx@...utronix.de, bp@...en8.de, mingo@...nel.org,
        brgerst@...il.com, dvlasenk@...hat.com,
        linux-kernel@...r.kernel.org
Subject: [tip:x86/asm] x86/entry/64: Use ENTRY() instead of ALIGN+GLOBAL for
 stub32_clone()

Commit-ID:  499934898fcd15e4337dc858be6c09cd9fd74e85
Gitweb:     http://git.kernel.org/tip/499934898fcd15e4337dc858be6c09cd9fd74e85
Author:     Jiri Slaby <jslaby@...e.cz>
AuthorDate: Thu, 24 Aug 2017 10:06:24 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 29 Aug 2017 13:23:30 +0200

x86/entry/64: Use ENTRY() instead of ALIGN+GLOBAL for stub32_clone()

ALIGN+GLOBAL is effectively what ENTRY() does, so use ENTRY() which is
dedicated for exactly this purpose -- global functions.

Note that stub32_clone() is a C-like leaf function -- it has a standard
call frame -- it only switches one argument and continues by jumping
into C. Since each ENTRY() should be balanced by some END*() marker, we
add a corresponding ENDPROC() to stub32_clone() too.

Besides that, x86's custom GLOBAL macro is going to die very soon.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/20170824080624.7768-2-jslaby@suse.cz
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/entry/entry_64_compat.S | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/entry/entry_64_compat.S b/arch/x86/entry/entry_64_compat.S
index 5314d7b..4b86d8d 100644
--- a/arch/x86/entry/entry_64_compat.S
+++ b/arch/x86/entry/entry_64_compat.S
@@ -341,8 +341,7 @@ ENTRY(entry_INT80_compat)
 	jmp	restore_regs_and_iret
 END(entry_INT80_compat)
 
-	ALIGN
-GLOBAL(stub32_clone)
+ENTRY(stub32_clone)
 	/*
 	 * The 32-bit clone ABI is: clone(..., int tls_val, int *child_tidptr).
 	 * The 64-bit clone ABI is: clone(..., int *child_tidptr, int tls_val).
@@ -352,3 +351,4 @@ GLOBAL(stub32_clone)
 	 */
 	xchg	%r8, %rcx
 	jmp	sys_clone
+ENDPROC(stub32_clone)