[PATCH v2] powerpc/boot: Delete unneeded .globl _zimage_start

[Fangrui Song]

.globl sets the symbol binding to STB_GLOBAL while .weak sets the
binding to STB_WEAK. GNU as let .weak override .globl since binutils-gdb
5ca547dc2399a0a5d9f20626d4bf5547c3ccfddd (1996). Clang integrated
assembler let the last win but it may error in the future.

Since it is a convention that only one binding directive is used, just
delete .globl.

Fixes: cd197ffcf10b "[POWERPC] zImage: Cleanup and improve zImage entry point"
Fixes: ee9d21b3b358 "powerpc/boot: Ensure _zimage_start is a weak symbol"
Link: https://github.com/ClangBuiltLinux/linux/issues/937
Signed-off-by: Fangrui Song <maskray at google.com>
Cc: Alan Modra <amodra at gmail.com>
Cc: Joel Stanley <joel at jms.id.au>
Cc: Michael Ellerman <mpe at ellerman.id.au>
Cc: Nick Desaulniers <ndesaulniers at google.com>
Cc: Segher Boessenkool <segher at kernel.crashing.org>
Cc: clang-built-linux at googlegroups.com
---
 arch/powerpc/boot/crt0.S | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/arch/powerpc/boot/crt0.S b/arch/powerpc/boot/crt0.S
index 92608f34d312..1d83966f5ef6 100644
--- a/arch/powerpc/boot/crt0.S
+++ b/arch/powerpc/boot/crt0.S
@@ -44,9 +44,6 @@ p_end:		.long	_end
 p_pstack:	.long	_platform_stack_top
 #endif
 
-	.globl	_zimage_start
-	/* Clang appears to require the .weak directive to be after the symbol
-	 * is defined. See https://bugs.llvm.org/show_bug.cgi?id=38921  */
 	.weak	_zimage_start
 _zimage_start:
 	.globl	_zimage_start_lib
-- 
2.25.1.696.g5e7596f4ac-goog