diff mbox

[v4,4/4] powerpc/kbuild: move -mprofile-kernel check to Kconfig

Message ID 20180516141458.18996-5-npiggin@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Nicholas Piggin May 16, 2018, 2:14 p.m. UTC 
This eliminates the workaround that requires disabling
-mprofile-kernel by default in Kconfig.

[ Note: this depends on https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git kconfig-shell-v3 ]

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
Since v3:
- Moved a stray hunk back to patch 3 where it belongs.

 arch/powerpc/Kconfig  | 16 +---------------
 arch/powerpc/Makefile | 14 ++------------
 2 files changed, 3 insertions(+), 27 deletions(-)

Comments

kernel test robot May 17, 2018, 5:28 p.m. UTC | #1 
Hi Nicholas,

I love your patch! Yet something to improve:

[auto build test ERROR on powerpc/next]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Nicholas-Piggin/powerpc-patches-for-new-Kconfig-language/20180517-224044
base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: powerpc-allmodconfig
compiler: powerpc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        make.cross ARCH=powerpc  allmodconfig
        make.cross ARCH=powerpc 

All errors (new ones prefixed by >>):

   arch/powerpc/Kconfig:467:warning: ignoring unsupported character '$'
   arch/powerpc/Kconfig:467:warning: ignoring unsupported character '$'
>> arch/powerpc/Kconfig:468: syntax error
   arch/powerpc/Kconfig:467:warning: ignoring unsupported character '$'
   arch/powerpc/Kconfig:467:warning: ignoring unsupported character '$'
>> arch/powerpc/Kconfig:467: invalid option
   make[2]: *** [allmodconfig] Error 1
   make[1]: *** [allmodconfig] Error 2
   make: *** [sub-make] Error 2
--
   arch/powerpc/Kconfig:467:warning: ignoring unsupported character '$'
   arch/powerpc/Kconfig:467:warning: ignoring unsupported character '$'
>> arch/powerpc/Kconfig:468: syntax error
   arch/powerpc/Kconfig:467:warning: ignoring unsupported character '$'
   arch/powerpc/Kconfig:467:warning: ignoring unsupported character '$'
>> arch/powerpc/Kconfig:467: invalid option
   make[2]: *** [oldconfig] Error 1
   make[1]: *** [oldconfig] Error 2
   make: *** [sub-make] Error 2
--
   arch/powerpc/Kconfig:467:warning: ignoring unsupported character '$'
   arch/powerpc/Kconfig:467:warning: ignoring unsupported character '$'
>> arch/powerpc/Kconfig:468: syntax error
   arch/powerpc/Kconfig:467:warning: ignoring unsupported character '$'
   arch/powerpc/Kconfig:467:warning: ignoring unsupported character '$'
>> arch/powerpc/Kconfig:467: invalid option
   make[2]: *** [olddefconfig] Error 1
   make[2]: Target 'oldnoconfig' not remade because of errors.
   make[1]: *** [oldnoconfig] Error 2
   make: *** [sub-make] Error 2

vim +468 arch/powerpc/Kconfig

e05c0e81 Kevin Hao       2013-07-16  443  
3d72bbc4 Michael Neuling 2013-02-13  444  config PPC_TRANSACTIONAL_MEM
3d72bbc4 Michael Neuling 2013-02-13  445         bool "Transactional Memory support for POWERPC"
3d72bbc4 Michael Neuling 2013-02-13  446         depends on PPC_BOOK3S_64
3d72bbc4 Michael Neuling 2013-02-13  447         depends on SMP
7b37a123 Michael Neuling 2014-01-08  448         select ALTIVEC
7b37a123 Michael Neuling 2014-01-08  449         select VSX
3d72bbc4 Michael Neuling 2013-02-13  450         default n
3d72bbc4 Michael Neuling 2013-02-13  451         ---help---
3d72bbc4 Michael Neuling 2013-02-13  452           Support user-mode Transactional Memory on POWERPC.
3d72bbc4 Michael Neuling 2013-02-13  453  
951eedeb Nicholas Piggin 2017-05-29  454  config LD_HEAD_STUB_CATCH
951eedeb Nicholas Piggin 2017-05-29  455  	bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
951eedeb Nicholas Piggin 2017-05-29  456  	depends on PPC64
951eedeb Nicholas Piggin 2017-05-29  457  	default n
951eedeb Nicholas Piggin 2017-05-29  458  	help
951eedeb Nicholas Piggin 2017-05-29  459  	  Very large kernels can cause linker branch stubs to be generated by
951eedeb Nicholas Piggin 2017-05-29  460  	  code in head_64.S, which moves the head text sections out of their
951eedeb Nicholas Piggin 2017-05-29  461  	  specified location. This option can work around the problem.
951eedeb Nicholas Piggin 2017-05-29  462  
951eedeb Nicholas Piggin 2017-05-29  463  	  If unsure, say "N".
951eedeb Nicholas Piggin 2017-05-29  464  
8c50b72a Torsten Duwe    2016-03-03  465  config MPROFILE_KERNEL
8c50b72a Torsten Duwe    2016-03-03  466  	depends on PPC64 && CPU_LITTLE_ENDIAN
4421b963 Nicholas Piggin 2018-05-17 @467  	def_bool $(success $(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
8c50b72a Torsten Duwe    2016-03-03 @468  

:::::: The code at line 468 was first introduced by commit
:::::: 8c50b72a3b4f1f7cdfdfebd233b1cbd121262e65 powerpc/ftrace: Add Kconfig & Make glue for mprofile-kernel

:::::: TO: Torsten Duwe <duwe@lst.de>
:::::: CC: Michael Ellerman <mpe@ellerman.id.au>

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Masahiro Yamada May 29, 2018, 1:48 p.m. UTC | #2 
2018-05-16 23:14 GMT+09:00 Nicholas Piggin <npiggin@gmail.com>:
> This eliminates the workaround that requires disabling
> -mprofile-kernel by default in Kconfig.
>
> [ Note: this depends on https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git kconfig-shell-v3 ]
>
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
> ---
> Since v3:
> - Moved a stray hunk back to patch 3 where it belongs.
>
>  arch/powerpc/Kconfig  | 16 +---------------
>  arch/powerpc/Makefile | 14 ++------------
>  2 files changed, 3 insertions(+), 27 deletions(-)
>
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 512fcc177c87..af527f894f9b 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -460,23 +460,9 @@ config LD_HEAD_STUB_CATCH
>
>           If unsure, say "N".
>
> -config DISABLE_MPROFILE_KERNEL
> -       bool "Disable use of mprofile-kernel for kernel tracing"
> -       depends on PPC64 && CPU_LITTLE_ENDIAN
> -       default y
> -       help
> -         Selecting this options disables use of the mprofile-kernel ABI for
> -         kernel tracing. That will cause options such as live patching
> -         (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
> -         be disabled also.
> -
> -         If you have a toolchain which supports mprofile-kernel, then you can
> -         disable this. Otherwise leave it enabled. If you're not sure, say
> -         "Y".
> -
>  config MPROFILE_KERNEL
>         depends on PPC64 && CPU_LITTLE_ENDIAN
> -       def_bool !DISABLE_MPROFILE_KERNEL
> +       def_bool $(success $(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)


Your fix-up patch is good,
but could you check my comments below please?



>  config IOMMU_HELPER
>         def_bool PPC64
> diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
> index 6faf1d6ad9dd..8f7a64fe7370 100644
> --- a/arch/powerpc/Makefile
> +++ b/arch/powerpc/Makefile
> @@ -161,18 +161,8 @@ CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=powerpc64
>  endif
>
>  ifdef CONFIG_MPROFILE_KERNEL
> -    ifeq ($(shell $(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__),OK)


You do not need to compare the returned string with "OK" any more.


Please remove the
echo "OK"
line from the shell script.



> -        CC_FLAGS_FTRACE := -pg -mprofile-kernel
> -        KBUILD_CPPFLAGS += -DCC_USING_MPROFILE_KERNEL
> -    else
> -        # If the user asked for mprofile-kernel but the toolchain doesn't
> -        # support it, emit a warning and deliberately break the build later
> -        # with mprofile-kernel-not-supported. We would prefer to make this an
> -        # error right here, but then the user would never be able to run
> -        # oldconfig to change their configuration.
> -        $(warning Compiler does not support mprofile-kernel, set CONFIG_DISABLE_MPROFILE_KERNEL)
> -        CC_FLAGS_FTRACE := -mprofile-kernel-not-supported
> -    endif
> +       CC_FLAGS_FTRACE := -pg -mprofile-kernel
> +       KBUILD_CPPFLAGS += -DCC_USING_MPROFILE_KERNEL


Now, CONFIG_MPROFILE_KERNEL is equivalent to CC_USING_MPROFILE_KERNEL.


If you replace #ifdef CC_USING_MPROFILE_KERNEL
with #ifdef CONFIG_MPROFILE_KERNEL,
you can remove CC_USING_MRPROFILE_KERNEL entirely, right?





>  endif
>
>  CFLAGS-$(CONFIG_CELL_CPU) += $(call cc-option,-mcpu=cell)
> --
> 2.17.0
>
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diff mbox

Patch

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 512fcc177c87..af527f894f9b 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -460,23 +460,9 @@  config LD_HEAD_STUB_CATCH
 
 	  If unsure, say "N".
 
-config DISABLE_MPROFILE_KERNEL
-	bool "Disable use of mprofile-kernel for kernel tracing"
-	depends on PPC64 && CPU_LITTLE_ENDIAN
-	default y
-	help
-	  Selecting this options disables use of the mprofile-kernel ABI for
-	  kernel tracing. That will cause options such as live patching
-	  (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
-	  be disabled also.
-
-	  If you have a toolchain which supports mprofile-kernel, then you can
-	  disable this. Otherwise leave it enabled. If you're not sure, say
-	  "Y".
-
 config MPROFILE_KERNEL
 	depends on PPC64 && CPU_LITTLE_ENDIAN
-	def_bool !DISABLE_MPROFILE_KERNEL
+	def_bool $(success $(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
 
 config IOMMU_HELPER
 	def_bool PPC64
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 6faf1d6ad9dd..8f7a64fe7370 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -161,18 +161,8 @@  CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=powerpc64
 endif
 
 ifdef CONFIG_MPROFILE_KERNEL
-    ifeq ($(shell $(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__),OK)
-        CC_FLAGS_FTRACE := -pg -mprofile-kernel
-        KBUILD_CPPFLAGS += -DCC_USING_MPROFILE_KERNEL
-    else
-        # If the user asked for mprofile-kernel but the toolchain doesn't
-        # support it, emit a warning and deliberately break the build later
-        # with mprofile-kernel-not-supported. We would prefer to make this an
-        # error right here, but then the user would never be able to run
-        # oldconfig to change their configuration.
-        $(warning Compiler does not support mprofile-kernel, set CONFIG_DISABLE_MPROFILE_KERNEL)
-        CC_FLAGS_FTRACE := -mprofile-kernel-not-supported
-    endif
+	CC_FLAGS_FTRACE := -pg -mprofile-kernel
+	KBUILD_CPPFLAGS += -DCC_USING_MPROFILE_KERNEL
 endif
 
 CFLAGS-$(CONFIG_CELL_CPU) += $(call cc-option,-mcpu=cell)