csky: Correct position of _stext

Correct position of _stext to prevent check_kernel_text_object
warning [1].

[1] https://lore.kernel.org/linux-csky/YfLpNkmlvoR8iPcq@ls3530/

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Cc: Helge Deller <deller@gmx.de>

Author: guoren83

arch/csky/include/asm/sections.h

@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ASM_SECTIONS_H
+#define __ASM_SECTIONS_H
+
+#include <asm-generic/sections.h>
+
+extern char _start[];
+
+#endif /* __ASM_SECTIONS_H */

arch/csky/kernel/setup.c

@@ -31,7 +31,7 @@ static void __init csky_memblock_init(void)
 	unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };
 	signed long size;
 
-	memblock_reserve(__pa(_stext), _end - _stext);
+	memblock_reserve(__pa(_start), _end - _start);
 
 	early_init_fdt_reserve_self();
 	early_init_fdt_scan_reserved_mem();
@@ -78,7 +78,7 @@ void __init setup_arch(char **cmdline_p)
 	pr_info("Phys. mem: %ldMB\n",
 		(unsigned long) memblock_phys_mem_size()/1024/1024);
 
-	setup_initial_init_mm(_stext, _etext, _edata, _end);
+	setup_initial_init_mm(_start, _etext, _edata, _end);
 
 	parse_early_param();
 

arch/csky/kernel/vmlinux.lds.S

@@ -22,7 +22,7 @@ SECTIONS
 {
 	. = PAGE_OFFSET + PHYS_OFFSET_OFFSET;
 
-	_stext = .;
+	_start = .;
 	__init_begin = .;
 	HEAD_TEXT_SECTION
 	INIT_TEXT_SECTION(PAGE_SIZE)
@@ -33,6 +33,7 @@ SECTIONS
 
 	.text : AT(ADDR(.text) - LOAD_OFFSET) {
 		_text = .;
+		_stext = .;
 		VBR_BASE
 		IRQENTRY_TEXT
 		SOFTIRQENTRY_TEXT