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

[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 <greentime@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

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

[Masami Hiramatsu]

On Tue,  4 Sep 2018 15:54:19 +0800
Greentime Hu <green.hu@gmail.com> wrote:

> 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.

Yes, that is exactly what I did for arm.

Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>

Thanks!

> 
> Link: https://lkml.org/lkml/2018/9/1/125
> Signed-off-by: Greentime Hu <greentime@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
> 


-- 
Masami Hiramatsu <mhiramat@kernel.org>