[PATCH] nds32: linker script: GCOV kernel may refers data in __exit

[Greentime Hu]

This patch is used to fix nds32 allmodconfig/allyesconfig build error
because GCOV kernel embeds counters in the kernel for each line
and a part of that embed in __exit text. So we need to keep the
EXIT_TEXT and EXIT_DATA  if CONFIG_GCOV_KERNEL=y.

Link: https://lkml.org/lkml/2018/9/1/125
Signed-off-by: Greentime Hu <greent...@andestech.com>
---
 arch/nds32/kernel/vmlinux.lds.S | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/nds32/kernel/vmlinux.lds.S b/arch/nds32/kernel/vmlinux.lds.S
index 288313b886ef..9e90f30a181d 100644
--- a/arch/nds32/kernel/vmlinux.lds.S
+++ b/arch/nds32/kernel/vmlinux.lds.S
@@ -13,14 +13,26 @@ OUTPUT_ARCH(nds32)
 ENTRY(_stext_lma)
 jiffies = jiffies_64;
 
+#if defined(CONFIG_GCOV_KERNEL)
+#define NDS32_EXIT_KEEP(x)     x
+#else
+#define NDS32_EXIT_KEEP(x)
+#endif
+
 SECTIONS
 {
        _stext_lma = TEXTADDR - LOAD_OFFSET;
        . = TEXTADDR;
        __init_begin = .;
        HEAD_TEXT_SECTION
+       .exit.text : {
+               NDS32_EXIT_KEEP(EXIT_TEXT)
+       }
        INIT_TEXT_SECTION(PAGE_SIZE)
        INIT_DATA_SECTION(16)
+       .exit.data : {
+               NDS32_EXIT_KEEP(EXIT_DATA)
+       }
        PERCPU_SECTION(L1_CACHE_BYTES)
        __init_end = .;
 
-- 
2.18.0