linux-kernel - [PATCH v3 06/29] x86: assembly, annotate functions by ENTRY, not GLOBAL

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Date:   Fri, 21 Apr 2017 16:12:42 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     mingo@...hat.com
Cc:     tglx@...utronix.de, hpa@...or.com, x86@...nel.org,
        jpoimboe@...hat.com, linux-kernel@...r.kernel.org,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH v3 06/29] x86: assembly, annotate functions by ENTRY, not GLOBAL

GLOBAL is meant for global symbols, but not functions. Use ENTRY which
is dedicated for global functions:
* it aligns the functions properly
* it is expected to have a corresponding ENDPROC too.

startup_64, which uses .globl explicitly, is converted too.

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

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: <x86@...nel.org>
---
 arch/x86/boot/copy.S             | 8 ++++----
 arch/x86/boot/pmjump.S           | 4 ++--
 arch/x86/entry/entry_64_compat.S | 3 +--
 arch/x86/kernel/ftrace_64.S      | 2 +-
 arch/x86/kernel/head_64.S        | 5 +++--
 5 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/arch/x86/boot/copy.S b/arch/x86/boot/copy.S
index 15d9f74b0008..030a7bde51da 100644
--- a/arch/x86/boot/copy.S
+++ b/arch/x86/boot/copy.S
@@ -17,7 +17,7 @@
 	.code16
 	.text
 
-GLOBAL(memcpy)
+ENTRY(memcpy)
 	pushw	%si
 	pushw	%di
 	movw	%ax, %di
@@ -33,7 +33,7 @@ GLOBAL(memcpy)
 	retl
 ENDPROC(memcpy)
 
-GLOBAL(memset)
+ENTRY(memset)
 	pushw	%di
 	movw	%ax, %di
 	movzbl	%dl, %eax
@@ -48,7 +48,7 @@ GLOBAL(memset)
 	retl
 ENDPROC(memset)
 
-GLOBAL(copy_from_fs)
+ENTRY(copy_from_fs)
 	pushw	%ds
 	pushw	%fs
 	popw	%ds
@@ -57,7 +57,7 @@ GLOBAL(copy_from_fs)
 	retl
 ENDPROC(copy_from_fs)
 
-GLOBAL(copy_to_fs)
+ENTRY(copy_to_fs)
 	pushw	%es
 	pushw	%fs
 	popw	%es
diff --git a/arch/x86/boot/pmjump.S b/arch/x86/boot/pmjump.S
index 3e0edc6d2a20..6528f78a79b5 100644
--- a/arch/x86/boot/pmjump.S
+++ b/arch/x86/boot/pmjump.S
@@ -23,7 +23,7 @@
 /*
  * void protected_mode_jump(u32 entrypoint, u32 bootparams);
  */
-GLOBAL(protected_mode_jump)
+ENTRY(protected_mode_jump)
 	movl	%edx, %esi		# Pointer to boot_params table
 
 	xorl	%ebx, %ebx
@@ -48,7 +48,7 @@ ENDPROC(protected_mode_jump)
 
 	.code32
 	.section ".text32","ax"
-GLOBAL(in_pm32)
+ENTRY(in_pm32)
 	# Set up data segments for flat 32-bit mode
 	movl	%ecx, %ds
 	movl	%ecx, %es
diff --git a/arch/x86/entry/entry_64_compat.S b/arch/x86/entry/entry_64_compat.S
index 14dc2f259e2f..ba6af2fba6a7 100644
--- a/arch/x86/entry/entry_64_compat.S
+++ b/arch/x86/entry/entry_64_compat.S
@@ -342,8 +342,7 @@ ENTRY(entry_INT80_compat)
 	jmp	restore_regs_and_iret
 ENDPROC(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).
diff --git a/arch/x86/kernel/ftrace_64.S b/arch/x86/kernel/ftrace_64.S
index a915729c0246..76c774a5e792 100644
--- a/arch/x86/kernel/ftrace_64.S
+++ b/arch/x86/kernel/ftrace_64.S
@@ -314,7 +314,7 @@ ENTRY(ftrace_graph_caller)
 	retq
 ENDPROC(ftrace_graph_caller)
 
-GLOBAL(return_to_handler)
+ENTRY(return_to_handler)
 	subq  $24, %rsp
 
 	/* Save the return values */
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index ac9d327d2e42..e1da48448cc0 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -46,8 +46,7 @@ L3_START_KERNEL = pud_index(__START_KERNEL_map)
 	.text
 	__HEAD
 	.code64
-	.globl startup_64
-startup_64:
+ENTRY(startup_64)
 	/*
 	 * At this point the CPU runs in 64bit mode CS.L = 1 CS.D = 0,
 	 * and someone has loaded an identity mapped page table
@@ -168,6 +167,8 @@ startup_64:
 .Lskip_fixup:
 	movq	$(early_level4_pgt - __START_KERNEL_map), %rax
 	jmp 1f
+ENDPROC(startup_64)
+
 ENTRY(secondary_startup_64)
 	/*
 	 * At this point the CPU runs in 64bit mode CS.L = 1 CS.D = 0,
-- 
2.12.2