[PATCH v3 0/2] MIPS: Remove some code

[PATCH v3 0/2] MIPS: Remove some code

[Tiezhu Yang]

Thanks Nathan, Masahiro and Ryutaroh.

Tiezhu Yang (2):
  MIPS: SGI-IP22: Remove unnecessary check of GCC option
  MIPS: Makefile: Remove "ifdef need-compiler" for Kbuild.platforms

 arch/mips/Makefile          | 2 --
 arch/mips/sgi-ip22/Platform | 5 -----
 2 files changed, 7 deletions(-)

-- 
2.1.0

[PATCH v3 1/2] MIPS: SGI-IP22: Remove unnecessary check of GCC option

[Tiezhu Yang]

According to the document "Minimal requirements to compile the Kernel [1],
the minimal version of GCC is 5.1, -mr10k-cache-barrier=store is supported
with GCC 5.1 [2], so just remove the unnecessary check to fix the build
error [3]:

  arch/mips/sgi-ip22/Platform:28: *** gcc doesn't support needed option -mr10k-cache-barrier=store.  Stop.

[1] https://www.kernel.org/doc/html/latest/process/changes.html
[2] https://gcc.gnu.org/onlinedocs/gcc-5.1.0/gcc/MIPS-Options.html
[3] https://github.com/ClangBuiltLinux/linux/issues/1543

Reported-by: Ryutaroh Matsumoto <ryutaroh@ict.e.titech.ac.jp>
Suggested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
 arch/mips/sgi-ip22/Platform | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/arch/mips/sgi-ip22/Platform b/arch/mips/sgi-ip22/Platform
index 62fa30b..a4c46e3 100644
--- a/arch/mips/sgi-ip22/Platform
+++ b/arch/mips/sgi-ip22/Platform
@@ -23,10 +23,5 @@ endif
 # be 16kb aligned or the handling of the current variable will break.
 # Simplified: what IP22 does at 128MB+ in ksegN, IP28 does at 512MB+ in xkphys
 #
-ifdef CONFIG_SGI_IP28
-  ifeq ($(call cc-option-yn,-march=r10000 -mr10k-cache-barrier=store), n)
-      $(error gcc doesn't support needed option -mr10k-cache-barrier=store)
-  endif
-endif
 cflags-$(CONFIG_SGI_IP28)	+= -mr10k-cache-barrier=store -I$(srctree)/arch/mips/include/asm/mach-ip28
 load-$(CONFIG_SGI_IP28)		+= 0xa800000020004000
-- 
2.1.0

[PATCH v3 2/2] MIPS: Makefile: Remove "ifdef need-compiler" for Kbuild.platforms

[Tiezhu Yang]

After commit 13ceb48bc19c ("MIPS: Loongson2ef: Remove unnecessary
{as,cc}-option calls"), no need to use "ifdef need-compiler" for
Kbuild.platforms, because the cause of the build issue mentioned
in commit 0706f74f719e ("MIPS: fix *-pkg builds for loongson2ef
platform") has been disappeared, so just remove it.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
 arch/mips/Makefile | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index ace7f03..e036fc0 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -253,9 +253,7 @@ endif
 #
 # Board-dependent options and extra files
 #
-ifdef need-compiler
 include $(srctree)/arch/mips/Kbuild.platforms
-endif
 
 ifdef CONFIG_PHYSICAL_START
 load-y					= $(CONFIG_PHYSICAL_START)
-- 
2.1.0

Re: [PATCH v3 1/2] MIPS: SGI-IP22: Remove unnecessary check of GCC option

[Nathan Chancellor]

On Mon, Dec 13, 2021 at 05:57:56PM +0800, Tiezhu Yang wrote:
> According to the document "Minimal requirements to compile the Kernel [1],
> the minimal version of GCC is 5.1, -mr10k-cache-barrier=store is supported
> with GCC 5.1 [2], so just remove the unnecessary check to fix the build
> error [3]:
> 
>   arch/mips/sgi-ip22/Platform:28: *** gcc doesn't support needed option -mr10k-cache-barrier=store.  Stop.
> 
> [1] https://www.kernel.org/doc/html/latest/process/changes.html
> [2] https://gcc.gnu.org/onlinedocs/gcc-5.1.0/gcc/MIPS-Options.html
> [3] https://github.com/ClangBuiltLinux/linux/issues/1543
> 
> Reported-by: Ryutaroh Matsumoto <ryutaroh@ict.e.titech.ac.jp>
> Suggested-by: Nathan Chancellor <nathan@kernel.org>
> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>

Thanks for sending this!

Reviewed-by: Nathan Chancellor <nathan@kernel.org>

> ---
>  arch/mips/sgi-ip22/Platform | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/arch/mips/sgi-ip22/Platform b/arch/mips/sgi-ip22/Platform
> index 62fa30b..a4c46e3 100644
> --- a/arch/mips/sgi-ip22/Platform
> +++ b/arch/mips/sgi-ip22/Platform
> @@ -23,10 +23,5 @@ endif
>  # be 16kb aligned or the handling of the current variable will break.
>  # Simplified: what IP22 does at 128MB+ in ksegN, IP28 does at 512MB+ in xkphys
>  #
> -ifdef CONFIG_SGI_IP28
> -  ifeq ($(call cc-option-yn,-march=r10000 -mr10k-cache-barrier=store), n)
> -      $(error gcc doesn't support needed option -mr10k-cache-barrier=store)
> -  endif
> -endif
>  cflags-$(CONFIG_SGI_IP28)	+= -mr10k-cache-barrier=store -I$(srctree)/arch/mips/include/asm/mach-ip28
>  load-$(CONFIG_SGI_IP28)		+= 0xa800000020004000
> -- 
> 2.1.0
> 

Re: [PATCH v3 2/2] MIPS: Makefile: Remove "ifdef need-compiler" for Kbuild.platforms

[Nathan Chancellor]

On Mon, Dec 13, 2021 at 05:57:57PM +0800, Tiezhu Yang wrote:
> After commit 13ceb48bc19c ("MIPS: Loongson2ef: Remove unnecessary
> {as,cc}-option calls"), no need to use "ifdef need-compiler" for
> Kbuild.platforms, because the cause of the build issue mentioned
> in commit 0706f74f719e ("MIPS: fix *-pkg builds for loongson2ef
> platform") has been disappeared, so just remove it.
> 
> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>

Reviewed-by: Nathan Chancellor <nathan@kernel.org>

> ---
>  arch/mips/Makefile | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/arch/mips/Makefile b/arch/mips/Makefile
> index ace7f03..e036fc0 100644
> --- a/arch/mips/Makefile
> +++ b/arch/mips/Makefile
> @@ -253,9 +253,7 @@ endif
>  #
>  # Board-dependent options and extra files
>  #
> -ifdef need-compiler
>  include $(srctree)/arch/mips/Kbuild.platforms
> -endif
>  
>  ifdef CONFIG_PHYSICAL_START
>  load-y					= $(CONFIG_PHYSICAL_START)
> -- 
> 2.1.0
> 

Re: [PATCH v3 1/2] MIPS: SGI-IP22: Remove unnecessary check of GCC option

[Masahiro Yamada]

On Mon, Dec 13, 2021 at 6:58 PM Tiezhu Yang <yangtiezhu@loongson.cn> wrote:
>
> According to the document "Minimal requirements to compile the Kernel [1],


[1] is the kernel document, so you do not need to refer to the URL.

You can say:

 According to Documentation/process/changes.rst, ...



https://www.kernel.org/doc/html/latest is the moving target.
If you get access to this URL some years later, the min GCC
version may not be 5.1



Other than the nit,

Reviewed-by: Masahiro Yamada <masahiroy@kernel.org>




> the minimal version of GCC is 5.1, -mr10k-cache-barrier=store is supported
> with GCC 5.1 [2], so just remove the unnecessary check to fix the build
> error [3]:
>
>   arch/mips/sgi-ip22/Platform:28: *** gcc doesn't support needed option -mr10k-cache-barrier=store.  Stop.
>
> [1] https://www.kernel.org/doc/html/latest/process/changes.html
> [2] https://gcc.gnu.org/onlinedocs/gcc-5.1.0/gcc/MIPS-Options.html
> [3] https://github.com/ClangBuiltLinux/linux/issues/1543
>
> Reported-by: Ryutaroh Matsumoto <ryutaroh@ict.e.titech.ac.jp>
> Suggested-by: Nathan Chancellor <nathan@kernel.org>
> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
> ---
>  arch/mips/sgi-ip22/Platform | 5 -----
>  1 file changed, 5 deletions(-)
>
> diff --git a/arch/mips/sgi-ip22/Platform b/arch/mips/sgi-ip22/Platform
> index 62fa30b..a4c46e3 100644
> --- a/arch/mips/sgi-ip22/Platform
> +++ b/arch/mips/sgi-ip22/Platform
> @@ -23,10 +23,5 @@ endif
>  # be 16kb aligned or the handling of the current variable will break.
>  # Simplified: what IP22 does at 128MB+ in ksegN, IP28 does at 512MB+ in xkphys
>  #
> -ifdef CONFIG_SGI_IP28
> -  ifeq ($(call cc-option-yn,-march=r10000 -mr10k-cache-barrier=store), n)
> -      $(error gcc doesn't support needed option -mr10k-cache-barrier=store)
> -  endif
> -endif
>  cflags-$(CONFIG_SGI_IP28)      += -mr10k-cache-barrier=store -I$(srctree)/arch/mips/include/asm/mach-ip28
>  load-$(CONFIG_SGI_IP28)                += 0xa800000020004000
> --
> 2.1.0
>


-- 
Best Regards
Masahiro Yamada

Re: [PATCH v3 2/2] MIPS: Makefile: Remove "ifdef need-compiler" for Kbuild.platforms

[Masahiro Yamada]

On Mon, Dec 13, 2021 at 6:58 PM Tiezhu Yang <yangtiezhu@loongson.cn> wrote:
>
> After commit 13ceb48bc19c ("MIPS: Loongson2ef: Remove unnecessary
> {as,cc}-option calls"), no need to use "ifdef need-compiler" for
> Kbuild.platforms, because the cause of the build issue mentioned
> in commit 0706f74f719e ("MIPS: fix *-pkg builds for loongson2ef
> platform") has been disappeared, so just remove it.
>
> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
> ---


Reviewed-by: Masahiro Yamada <masahiroy@kernel.org>


>  arch/mips/Makefile | 2 --
>  1 file changed, 2 deletions(-)
>
> diff --git a/arch/mips/Makefile b/arch/mips/Makefile
> index ace7f03..e036fc0 100644
> --- a/arch/mips/Makefile
> +++ b/arch/mips/Makefile
> @@ -253,9 +253,7 @@ endif
>  #
>  # Board-dependent options and extra files
>  #
> -ifdef need-compiler
>  include $(srctree)/arch/mips/Kbuild.platforms
> -endif
>
>  ifdef CONFIG_PHYSICAL_START
>  load-y                                 = $(CONFIG_PHYSICAL_START)
> --
> 2.1.0
>


-- 
Best Regards
Masahiro Yamada