[PATCH] kbuild: use KBUILD_DEFCONFIG as the fallback for DEFCONFIG_LIST

[PATCH] kbuild: use KBUILD_DEFCONFIG as the fallback for DEFCONFIG_LIST

[Masahiro Yamada]

Most of the Kconfig commands (except defconfig and all*config) read
the .config file as a base set of CONFIG options.

When it does not exist, the files in DEFCONFIG_LIST are searched in
this order and loaded if found.

I do not see much sense in the last two lines in DEFCONFIG_LIST.

[1] ARCH_DEFCONFIG

The entry for DEFCONFIG_LIST is guarded by 'depends on !UML'. So, the
ARCH_DEFCONFIG definition in arch/x86/um/Kconfig is meaningless.

arch/{sh,sparc,x86}/Kconfig define ARCH_DEFCONFIG depending on 32 or
64 bit variant symbols. This is a little bit strange; ARCH_DEFCONFIG
should be a fixed string because the base config file is loaded before
the symbol evaluation stage.

Using KBUILD_DEFCONFIG makes more sense because it is fixed before
Kconfig is invoked. Fortunately, arch/{sh,sparc,x86}/Makefile define it
in the same way, and it works as expected. Hence, replace ARCH_DEFCONFIG
with "arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)".

[2] arch/$(ARCH)/defconfig

This file path is no longer valid. The defconfig files are always located
in the arch configs/ directories.

  $ find arch -name defconfig | sort
  arch/alpha/configs/defconfig
  arch/arm64/configs/defconfig
  arch/csky/configs/defconfig
  arch/nds32/configs/defconfig
  arch/riscv/configs/defconfig
  arch/s390/configs/defconfig
  arch/unicore32/configs/defconfig

The path arch/*/configs/defconfig is already covered by
"arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)". So, this file path is
not necessary.

I moved the default KBUILD_DEFCONFIG to the top Makefile. Otherwise,
the 7 architectures listed above would end up with endless loop of
syncconfig.

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

 Makefile                 | 3 +++
 arch/sh/Kconfig          | 5 -----
 arch/sparc/Kconfig       | 5 -----
 arch/x86/Kconfig         | 5 -----
 arch/x86/um/Kconfig      | 5 -----
 init/Kconfig             | 3 +--
 scripts/kconfig/Makefile | 4 ----
 7 files changed, 4 insertions(+), 26 deletions(-)

diff --git a/Makefile b/Makefile
index 81d130ad9534..17cc09304561 100644
--- a/Makefile
+++ b/Makefile
@@ -388,6 +388,9 @@ endif
 KCONFIG_CONFIG	?= .config
 export KCONFIG_CONFIG
 
+# Default file for 'make defconfig'. This may be overridden by arch-Makefile.
+export KBUILD_DEFCONFIG := defconfig
+
 # SHELL used by kbuild
 CONFIG_SHELL := sh
 
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 9ece111b0254..b4f0e37b83eb 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -87,11 +87,6 @@ config SUPERH64
 	select HAVE_EXIT_THREAD
 	select KALLSYMS
 
-config ARCH_DEFCONFIG
-	string
-	default "arch/sh/configs/shx3_defconfig" if SUPERH32
-	default "arch/sh/configs/cayman_defconfig" if SUPERH64
-
 config GENERIC_BUG
 	def_bool y
 	depends on BUG && SUPERH32
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index c1dd6dd642f4..0de15380d1fc 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -95,11 +95,6 @@ config SPARC64
 	select PCI_DOMAINS if PCI
 	select ARCH_HAS_GIGANTIC_PAGE
 
-config ARCH_DEFCONFIG
-	string
-	default "arch/sparc/configs/sparc32_defconfig" if SPARC32
-	default "arch/sparc/configs/sparc64_defconfig" if SPARC64
-
 config ARCH_PROC_KCORE_TEXT
 	def_bool y
 
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index beea77046f9b..98935f4387f9 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -240,11 +240,6 @@ config OUTPUT_FORMAT
 	default "elf32-i386" if X86_32
 	default "elf64-x86-64" if X86_64
 
-config ARCH_DEFCONFIG
-	string
-	default "arch/x86/configs/i386_defconfig" if X86_32
-	default "arch/x86/configs/x86_64_defconfig" if X86_64
-
 config LOCKDEP_SUPPORT
 	def_bool y
 
diff --git a/arch/x86/um/Kconfig b/arch/x86/um/Kconfig
index a8985e1f7432..95d26a69088b 100644
--- a/arch/x86/um/Kconfig
+++ b/arch/x86/um/Kconfig
@@ -27,11 +27,6 @@ config X86_64
 	def_bool 64BIT
 	select MODULES_USE_ELF_RELA
 
-config ARCH_DEFCONFIG
-	string
-	default "arch/um/configs/i386_defconfig" if X86_32
-	default "arch/um/configs/x86_64_defconfig" if X86_64
-
 config 3_LEVEL_PGTABLES
 	bool "Three-level pagetables" if !64BIT
 	default 64BIT
diff --git a/init/Kconfig b/init/Kconfig
index 20a6ac33761c..240c1ed15c69 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -6,8 +6,7 @@ config DEFCONFIG_LIST
 	default "/lib/modules/$(shell,uname -r)/.config"
 	default "/etc/kernel-config"
 	default "/boot/config-$(shell,uname -r)"
-	default ARCH_DEFCONFIG
-	default "arch/$(ARCH)/defconfig"
+	default "arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)"
 
 config CC_IS_GCC
 	def_bool $(success,$(CC) --version | head -n 1 | grep -q gcc)
diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
index 5887ceb6229e..c9d0a4a8efb3 100644
--- a/scripts/kconfig/Makefile
+++ b/scripts/kconfig/Makefile
@@ -12,10 +12,6 @@ else
 Kconfig := Kconfig
 endif
 
-ifndef KBUILD_DEFCONFIG
-KBUILD_DEFCONFIG := defconfig
-endif
-
 ifeq ($(quiet),silent_)
 silent := -s
 endif
-- 
2.17.1

Re: [PATCH] kbuild: use KBUILD_DEFCONFIG as the fallback for DEFCONFIG_LIST

[Masahiro Yamada]

On Fri, Feb 28, 2020 at 12:47 PM Masahiro Yamada <masahiroy@kernel.org> wrote:
>
> Most of the Kconfig commands (except defconfig and all*config) read
> the .config file as a base set of CONFIG options.
>
> When it does not exist, the files in DEFCONFIG_LIST are searched in
> this order and loaded if found.
>
> I do not see much sense in the last two lines in DEFCONFIG_LIST.
>
> [1] ARCH_DEFCONFIG
>
> The entry for DEFCONFIG_LIST is guarded by 'depends on !UML'. So, the
> ARCH_DEFCONFIG definition in arch/x86/um/Kconfig is meaningless.
>
> arch/{sh,sparc,x86}/Kconfig define ARCH_DEFCONFIG depending on 32 or
> 64 bit variant symbols. This is a little bit strange; ARCH_DEFCONFIG
> should be a fixed string because the base config file is loaded before
> the symbol evaluation stage.
>
> Using KBUILD_DEFCONFIG makes more sense because it is fixed before
> Kconfig is invoked. Fortunately, arch/{sh,sparc,x86}/Makefile define it
> in the same way, and it works as expected. Hence, replace ARCH_DEFCONFIG
> with "arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)".
>
> [2] arch/$(ARCH)/defconfig
>
> This file path is no longer valid. The defconfig files are always located
> in the arch configs/ directories.
>
>   $ find arch -name defconfig | sort
>   arch/alpha/configs/defconfig
>   arch/arm64/configs/defconfig
>   arch/csky/configs/defconfig
>   arch/nds32/configs/defconfig
>   arch/riscv/configs/defconfig
>   arch/s390/configs/defconfig
>   arch/unicore32/configs/defconfig
>
> The path arch/*/configs/defconfig is already covered by
> "arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)". So, this file path is
> not necessary.
>
> I moved the default KBUILD_DEFCONFIG to the top Makefile. Otherwise,
> the 7 architectures listed above would end up with endless loop of
> syncconfig.
>
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>


I forgot to say this.
This is v2.

Changes in v2:
  - Move KBUILD_DEFCONFIG to fix endless loop of syncconfig


> ---
>
>  Makefile                 | 3 +++
>  arch/sh/Kconfig          | 5 -----
>  arch/sparc/Kconfig       | 5 -----
>  arch/x86/Kconfig         | 5 -----
>  arch/x86/um/Kconfig      | 5 -----
>  init/Kconfig             | 3 +--
>  scripts/kconfig/Makefile | 4 ----
>  7 files changed, 4 insertions(+), 26 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index 81d130ad9534..17cc09304561 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -388,6 +388,9 @@ endif
>  KCONFIG_CONFIG ?= .config
>  export KCONFIG_CONFIG
>
> +# Default file for 'make defconfig'. This may be overridden by arch-Makefile.
> +export KBUILD_DEFCONFIG := defconfig
> +
>  # SHELL used by kbuild
>  CONFIG_SHELL := sh
>
> diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
> index 9ece111b0254..b4f0e37b83eb 100644
> --- a/arch/sh/Kconfig
> +++ b/arch/sh/Kconfig
> @@ -87,11 +87,6 @@ config SUPERH64
>         select HAVE_EXIT_THREAD
>         select KALLSYMS
>
> -config ARCH_DEFCONFIG
> -       string
> -       default "arch/sh/configs/shx3_defconfig" if SUPERH32
> -       default "arch/sh/configs/cayman_defconfig" if SUPERH64
> -
>  config GENERIC_BUG
>         def_bool y
>         depends on BUG && SUPERH32
> diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
> index c1dd6dd642f4..0de15380d1fc 100644
> --- a/arch/sparc/Kconfig
> +++ b/arch/sparc/Kconfig
> @@ -95,11 +95,6 @@ config SPARC64
>         select PCI_DOMAINS if PCI
>         select ARCH_HAS_GIGANTIC_PAGE
>
> -config ARCH_DEFCONFIG
> -       string
> -       default "arch/sparc/configs/sparc32_defconfig" if SPARC32
> -       default "arch/sparc/configs/sparc64_defconfig" if SPARC64
> -
>  config ARCH_PROC_KCORE_TEXT
>         def_bool y
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index beea77046f9b..98935f4387f9 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -240,11 +240,6 @@ config OUTPUT_FORMAT
>         default "elf32-i386" if X86_32
>         default "elf64-x86-64" if X86_64
>
> -config ARCH_DEFCONFIG
> -       string
> -       default "arch/x86/configs/i386_defconfig" if X86_32
> -       default "arch/x86/configs/x86_64_defconfig" if X86_64
> -
>  config LOCKDEP_SUPPORT
>         def_bool y
>
> diff --git a/arch/x86/um/Kconfig b/arch/x86/um/Kconfig
> index a8985e1f7432..95d26a69088b 100644
> --- a/arch/x86/um/Kconfig
> +++ b/arch/x86/um/Kconfig
> @@ -27,11 +27,6 @@ config X86_64
>         def_bool 64BIT
>         select MODULES_USE_ELF_RELA
>
> -config ARCH_DEFCONFIG
> -       string
> -       default "arch/um/configs/i386_defconfig" if X86_32
> -       default "arch/um/configs/x86_64_defconfig" if X86_64
> -
>  config 3_LEVEL_PGTABLES
>         bool "Three-level pagetables" if !64BIT
>         default 64BIT
> diff --git a/init/Kconfig b/init/Kconfig
> index 20a6ac33761c..240c1ed15c69 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -6,8 +6,7 @@ config DEFCONFIG_LIST
>         default "/lib/modules/$(shell,uname -r)/.config"
>         default "/etc/kernel-config"
>         default "/boot/config-$(shell,uname -r)"
> -       default ARCH_DEFCONFIG
> -       default "arch/$(ARCH)/defconfig"
> +       default "arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)"
>
>  config CC_IS_GCC
>         def_bool $(success,$(CC) --version | head -n 1 | grep -q gcc)
> diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
> index 5887ceb6229e..c9d0a4a8efb3 100644
> --- a/scripts/kconfig/Makefile
> +++ b/scripts/kconfig/Makefile
> @@ -12,10 +12,6 @@ else
>  Kconfig := Kconfig
>  endif
>
> -ifndef KBUILD_DEFCONFIG
> -KBUILD_DEFCONFIG := defconfig
> -endif
> -
>  ifeq ($(quiet),silent_)
>  silent := -s
>  endif
> --
> 2.17.1
>


-- 
Best Regards
Masahiro Yamada

Re: [PATCH] kbuild: use KBUILD_DEFCONFIG as the fallback for DEFCONFIG_LIST

[Masahiro Yamada]

On Fri, Feb 28, 2020 at 12:48 PM Masahiro Yamada <masahiroy@kernel.org> wrote:
>
> On Fri, Feb 28, 2020 at 12:47 PM Masahiro Yamada <masahiroy@kernel.org> wrote:
> >
> > Most of the Kconfig commands (except defconfig and all*config) read
> > the .config file as a base set of CONFIG options.
> >
> > When it does not exist, the files in DEFCONFIG_LIST are searched in
> > this order and loaded if found.
> >
> > I do not see much sense in the last two lines in DEFCONFIG_LIST.
> >
> > [1] ARCH_DEFCONFIG
> >
> > The entry for DEFCONFIG_LIST is guarded by 'depends on !UML'. So, the
> > ARCH_DEFCONFIG definition in arch/x86/um/Kconfig is meaningless.
> >
> > arch/{sh,sparc,x86}/Kconfig define ARCH_DEFCONFIG depending on 32 or
> > 64 bit variant symbols. This is a little bit strange; ARCH_DEFCONFIG
> > should be a fixed string because the base config file is loaded before
> > the symbol evaluation stage.
> >
> > Using KBUILD_DEFCONFIG makes more sense because it is fixed before
> > Kconfig is invoked. Fortunately, arch/{sh,sparc,x86}/Makefile define it
> > in the same way, and it works as expected. Hence, replace ARCH_DEFCONFIG
> > with "arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)".
> >
> > [2] arch/$(ARCH)/defconfig
> >
> > This file path is no longer valid. The defconfig files are always located
> > in the arch configs/ directories.
> >
> >   $ find arch -name defconfig | sort
> >   arch/alpha/configs/defconfig
> >   arch/arm64/configs/defconfig
> >   arch/csky/configs/defconfig
> >   arch/nds32/configs/defconfig
> >   arch/riscv/configs/defconfig
> >   arch/s390/configs/defconfig
> >   arch/unicore32/configs/defconfig
> >
> > The path arch/*/configs/defconfig is already covered by
> > "arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)". So, this file path is
> > not necessary.
> >
> > I moved the default KBUILD_DEFCONFIG to the top Makefile. Otherwise,
> > the 7 architectures listed above would end up with endless loop of
> > syncconfig.
> >
> > Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
>
>
> I forgot to say this.
> This is v2.
>
> Changes in v2:
>   - Move KBUILD_DEFCONFIG to fix endless loop of syncconfig
>
>

Applied to linux-kbuild.


Best Regards
Masahiro Yamada

[PATCH] kbuild: use KBUILD_DEFCONFIG as the fallback for DEFCONFIG_LIST

[Masahiro Yamada]

Most of the Kconfig commands (except defconfig and all*config) read the
.config file as a base set of CONFIG options.

When it does not exist, the files in DEFCONFIG_LIST are searched in this
order and loaded if found.

I do not see much sense in the last two entries in DEFCONFIG_LIST.

[1] ARCH_DEFCONFIG

The entry for DEFCONFIG_LIST is guarded by 'depends on !UML'. So, the
ARCH_DEFCONFIG definition in arch/x86/um/Kconfig is meaningless.

arch/{sh,sparc,x86}/Kconfig define ARCH_DEFCONFIG depending on 32 or 64
bit variant symbols. This is a little bit strange; ARCH_DEFCONFIG should
be a fixed string because the base config file is loaded before the symbol
evaluation stage.

Using KBUILD_DEFCONFIG is saner because it is fixed before Kconfig is
invoked. Fortunately, arch/{sh,sparc,x86}/Makefile define it in the
same way, and it works as expected. Hence, replace ARCH_DEFCONFIG with
"arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)".

[2] arch/$(ARCH)/defconfig

This file path is no longer valid. The defconfig files are always located
in the arch configs/ directories.

  $ find arch -name defconfig | sort
  arch/alpha/configs/defconfig
  arch/arm64/configs/defconfig
  arch/csky/configs/defconfig
  arch/nds32/configs/defconfig
  arch/riscv/configs/defconfig
  arch/s390/configs/defconfig
  arch/unicore32/configs/defconfig

The path arch/*/configs/defconfig is already covered by
"arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)". So, this file path is
not necessary.

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

 arch/sh/Kconfig     | 5 -----
 arch/sparc/Kconfig  | 5 -----
 arch/x86/Kconfig    | 5 -----
 arch/x86/um/Kconfig | 5 -----
 init/Kconfig        | 3 +--
 5 files changed, 1 insertion(+), 22 deletions(-)

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 9ece111b0254..b4f0e37b83eb 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -87,11 +87,6 @@ config SUPERH64
 	select HAVE_EXIT_THREAD
 	select KALLSYMS
 
-config ARCH_DEFCONFIG
-	string
-	default "arch/sh/configs/shx3_defconfig" if SUPERH32
-	default "arch/sh/configs/cayman_defconfig" if SUPERH64
-
 config GENERIC_BUG
 	def_bool y
 	depends on BUG && SUPERH32
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index c1dd6dd642f4..0de15380d1fc 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -95,11 +95,6 @@ config SPARC64
 	select PCI_DOMAINS if PCI
 	select ARCH_HAS_GIGANTIC_PAGE
 
-config ARCH_DEFCONFIG
-	string
-	default "arch/sparc/configs/sparc32_defconfig" if SPARC32
-	default "arch/sparc/configs/sparc64_defconfig" if SPARC64
-
 config ARCH_PROC_KCORE_TEXT
 	def_bool y
 
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index beea77046f9b..98935f4387f9 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -240,11 +240,6 @@ config OUTPUT_FORMAT
 	default "elf32-i386" if X86_32
 	default "elf64-x86-64" if X86_64
 
-config ARCH_DEFCONFIG
-	string
-	default "arch/x86/configs/i386_defconfig" if X86_32
-	default "arch/x86/configs/x86_64_defconfig" if X86_64
-
 config LOCKDEP_SUPPORT
 	def_bool y
 
diff --git a/arch/x86/um/Kconfig b/arch/x86/um/Kconfig
index a8985e1f7432..95d26a69088b 100644
--- a/arch/x86/um/Kconfig
+++ b/arch/x86/um/Kconfig
@@ -27,11 +27,6 @@ config X86_64
 	def_bool 64BIT
 	select MODULES_USE_ELF_RELA
 
-config ARCH_DEFCONFIG
-	string
-	default "arch/um/configs/i386_defconfig" if X86_32
-	default "arch/um/configs/x86_64_defconfig" if X86_64
-
 config 3_LEVEL_PGTABLES
 	bool "Three-level pagetables" if !64BIT
 	default 64BIT
diff --git a/init/Kconfig b/init/Kconfig
index 452bc1835cd4..6ccdb168dee5 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -6,8 +6,7 @@ config DEFCONFIG_LIST
 	default "/lib/modules/$(shell,uname -r)/.config"
 	default "/etc/kernel-config"
 	default "/boot/config-$(shell,uname -r)"
-	default ARCH_DEFCONFIG
-	default "arch/$(ARCH)/defconfig"
+	default "arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)"
 
 config CC_IS_GCC
 	def_bool $(success,$(CC) --version | head -n 1 | grep -q gcc)
-- 
2.17.1

Re: [PATCH] kbuild: use KBUILD_DEFCONFIG as the fallback for DEFCONFIG_LIST

[Marek Szyprowski]

Dear All,

On 16.02.2020 16:45, Masahiro Yamada wrote:
> Most of the Kconfig commands (except defconfig and all*config) read the
> .config file as a base set of CONFIG options.
>
> When it does not exist, the files in DEFCONFIG_LIST are searched in this
> order and loaded if found.
>
> I do not see much sense in the last two entries in DEFCONFIG_LIST.
>
> [1] ARCH_DEFCONFIG
>
> The entry for DEFCONFIG_LIST is guarded by 'depends on !UML'. So, the
> ARCH_DEFCONFIG definition in arch/x86/um/Kconfig is meaningless.
>
> arch/{sh,sparc,x86}/Kconfig define ARCH_DEFCONFIG depending on 32 or 64
> bit variant symbols. This is a little bit strange; ARCH_DEFCONFIG should
> be a fixed string because the base config file is loaded before the symbol
> evaluation stage.
>
> Using KBUILD_DEFCONFIG is saner because it is fixed before Kconfig is
> invoked. Fortunately, arch/{sh,sparc,x86}/Makefile define it in the
> same way, and it works as expected. Hence, replace ARCH_DEFCONFIG with
> "arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)".
>
> [2] arch/$(ARCH)/defconfig
>
> This file path is no longer valid. The defconfig files are always located
> in the arch configs/ directories.
>
>    $ find arch -name defconfig | sort
>    arch/alpha/configs/defconfig
>    arch/arm64/configs/defconfig
>    arch/csky/configs/defconfig
>    arch/nds32/configs/defconfig
>    arch/riscv/configs/defconfig
>    arch/s390/configs/defconfig
>    arch/unicore32/configs/defconfig
>
> The path arch/*/configs/defconfig is already covered by
> "arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)". So, this file path is
> not necessary.
>
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

This patch landed in today's linux-next (next-20200221) and broke arm64 
builds:

--->8---

$ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- defconfig
*** Default configuration is based on 'defconfig'
#
# configuration written to .config
#
$ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- Image.gz
scripts/kconfig/conf  --syncconfig Kconfig
scripts/kconfig/conf  --syncconfig Kconfig
scripts/kconfig/conf  --syncconfig Kconfig
scripts/kconfig/conf  --syncconfig Kconfig
scripts/kconfig/conf  --syncconfig Kconfig
...

(endless loop)

--->8---

Reverting it fixes the issue:

--->8---

$ git revert cdd5d1a207d6a3a06c9e627a0234d9a6af6ad347
[detached HEAD 1080d6a13b6d] Revert "kbuild: use KBUILD_DEFCONFIG as the 
fallback for DEFCONFIG_LIST"
  5 files changed, 22 insertions(+), 1 deletion(-)
$ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- defconfig
*** Default configuration is based on 'defconfig'
#
# No change to .config
#
$ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- Image.gz
scripts/kconfig/conf  --syncconfig Kconfig
   UPD     include/config/kernel.release
   UPD     include/generated/utsrelease.h
   CC      scripts/mod/empty.o
...

$ aarch64-linux-gnu-gcc --version
aarch64-linux-gnu-gcc (Ubuntu/Linaro 7.4.0-1ubuntu1~18.04.1) 7.4.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
--->8---

It looks that the issue is similar to the one described here:

https://patchwork.kernel.org/patch/10453685/

I hope this report helps fixing the issue.

> ---
>
>   arch/sh/Kconfig     | 5 -----
>   arch/sparc/Kconfig  | 5 -----
>   arch/x86/Kconfig    | 5 -----
>   arch/x86/um/Kconfig | 5 -----
>   init/Kconfig        | 3 +--
>   5 files changed, 1 insertion(+), 22 deletions(-)
>
> diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
> index 9ece111b0254..b4f0e37b83eb 100644
> --- a/arch/sh/Kconfig
> +++ b/arch/sh/Kconfig
> @@ -87,11 +87,6 @@ config SUPERH64
>   	select HAVE_EXIT_THREAD
>   	select KALLSYMS
>   
> -config ARCH_DEFCONFIG
> -	string
> -	default "arch/sh/configs/shx3_defconfig" if SUPERH32
> -	default "arch/sh/configs/cayman_defconfig" if SUPERH64
> -
>   config GENERIC_BUG
>   	def_bool y
>   	depends on BUG && SUPERH32
> diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
> index c1dd6dd642f4..0de15380d1fc 100644
> --- a/arch/sparc/Kconfig
> +++ b/arch/sparc/Kconfig
> @@ -95,11 +95,6 @@ config SPARC64
>   	select PCI_DOMAINS if PCI
>   	select ARCH_HAS_GIGANTIC_PAGE
>   
> -config ARCH_DEFCONFIG
> -	string
> -	default "arch/sparc/configs/sparc32_defconfig" if SPARC32
> -	default "arch/sparc/configs/sparc64_defconfig" if SPARC64
> -
>   config ARCH_PROC_KCORE_TEXT
>   	def_bool y
>   
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index beea77046f9b..98935f4387f9 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -240,11 +240,6 @@ config OUTPUT_FORMAT
>   	default "elf32-i386" if X86_32
>   	default "elf64-x86-64" if X86_64
>   
> -config ARCH_DEFCONFIG
> -	string
> -	default "arch/x86/configs/i386_defconfig" if X86_32
> -	default "arch/x86/configs/x86_64_defconfig" if X86_64
> -
>   config LOCKDEP_SUPPORT
>   	def_bool y
>   
> diff --git a/arch/x86/um/Kconfig b/arch/x86/um/Kconfig
> index a8985e1f7432..95d26a69088b 100644
> --- a/arch/x86/um/Kconfig
> +++ b/arch/x86/um/Kconfig
> @@ -27,11 +27,6 @@ config X86_64
>   	def_bool 64BIT
>   	select MODULES_USE_ELF_RELA
>   
> -config ARCH_DEFCONFIG
> -	string
> -	default "arch/um/configs/i386_defconfig" if X86_32
> -	default "arch/um/configs/x86_64_defconfig" if X86_64
> -
>   config 3_LEVEL_PGTABLES
>   	bool "Three-level pagetables" if !64BIT
>   	default 64BIT
> diff --git a/init/Kconfig b/init/Kconfig
> index 452bc1835cd4..6ccdb168dee5 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -6,8 +6,7 @@ config DEFCONFIG_LIST
>   	default "/lib/modules/$(shell,uname -r)/.config"
>   	default "/etc/kernel-config"
>   	default "/boot/config-$(shell,uname -r)"
> -	default ARCH_DEFCONFIG
> -	default "arch/$(ARCH)/defconfig"
> +	default "arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)"
>   
>   config CC_IS_GCC
>   	def_bool $(success,$(CC) --version | head -n 1 | grep -q gcc)

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

Re: [PATCH] kbuild: use KBUILD_DEFCONFIG as the fallback for DEFCONFIG_LIST

[Masahiro Yamada]

On Fri, Feb 21, 2020 at 5:50 PM Marek Szyprowski
<m.szyprowski@samsung.com> wrote:
>
> Dear All,
>
> On 16.02.2020 16:45, Masahiro Yamada wrote:
> > Most of the Kconfig commands (except defconfig and all*config) read the
> > .config file as a base set of CONFIG options.
> >
> > When it does not exist, the files in DEFCONFIG_LIST are searched in this
> > order and loaded if found.
> >
> > I do not see much sense in the last two entries in DEFCONFIG_LIST.
> >
> > [1] ARCH_DEFCONFIG
> >
> > The entry for DEFCONFIG_LIST is guarded by 'depends on !UML'. So, the
> > ARCH_DEFCONFIG definition in arch/x86/um/Kconfig is meaningless.
> >
> > arch/{sh,sparc,x86}/Kconfig define ARCH_DEFCONFIG depending on 32 or 64
> > bit variant symbols. This is a little bit strange; ARCH_DEFCONFIG should
> > be a fixed string because the base config file is loaded before the symbol
> > evaluation stage.
> >
> > Using KBUILD_DEFCONFIG is saner because it is fixed before Kconfig is
> > invoked. Fortunately, arch/{sh,sparc,x86}/Makefile define it in the
> > same way, and it works as expected. Hence, replace ARCH_DEFCONFIG with
> > "arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)".
> >
> > [2] arch/$(ARCH)/defconfig
> >
> > This file path is no longer valid. The defconfig files are always located
> > in the arch configs/ directories.
> >
> >    $ find arch -name defconfig | sort
> >    arch/alpha/configs/defconfig
> >    arch/arm64/configs/defconfig
> >    arch/csky/configs/defconfig
> >    arch/nds32/configs/defconfig
> >    arch/riscv/configs/defconfig
> >    arch/s390/configs/defconfig
> >    arch/unicore32/configs/defconfig
> >
> > The path arch/*/configs/defconfig is already covered by
> > "arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)". So, this file path is
> > not necessary.
> >
> > Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
>
> This patch landed in today's linux-next (next-20200221) and broke arm64
> builds:
>
> --->8---
>
> $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- defconfig
> *** Default configuration is based on 'defconfig'
> #
> # configuration written to .config
> #
> $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- Image.gz
> scripts/kconfig/conf  --syncconfig Kconfig
> scripts/kconfig/conf  --syncconfig Kconfig
> scripts/kconfig/conf  --syncconfig Kconfig
> scripts/kconfig/conf  --syncconfig Kconfig
> scripts/kconfig/conf  --syncconfig Kconfig
> ...
>
> (endless loop)
>
> --->8---
>
> Reverting it fixes the issue:



My bad.

This is because arch/arm64/Makefile does not define
KBUILD_DEFCONFIG.



I will drop it.

Sorry about that.





>
> --->8---
>
> $ git revert cdd5d1a207d6a3a06c9e627a0234d9a6af6ad347
> [detached HEAD 1080d6a13b6d] Revert "kbuild: use KBUILD_DEFCONFIG as the
> fallback for DEFCONFIG_LIST"
>   5 files changed, 22 insertions(+), 1 deletion(-)
> $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- defconfig
> *** Default configuration is based on 'defconfig'
> #
> # No change to .config
> #
> $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- Image.gz
> scripts/kconfig/conf  --syncconfig Kconfig
>    UPD     include/config/kernel.release
>    UPD     include/generated/utsrelease.h
>    CC      scripts/mod/empty.o
> ...
>
> $ aarch64-linux-gnu-gcc --version
> aarch64-linux-gnu-gcc (Ubuntu/Linaro 7.4.0-1ubuntu1~18.04.1) 7.4.0
> Copyright (C) 2017 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions. There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> --->8---
>
> It looks that the issue is similar to the one described here:
>
> https://patchwork.kernel.org/patch/10453685/
>
> I hope this report helps fixing the issue.
>
> > ---
> >
> >   arch/sh/Kconfig     | 5 -----
> >   arch/sparc/Kconfig  | 5 -----
> >   arch/x86/Kconfig    | 5 -----
> >   arch/x86/um/Kconfig | 5 -----
> >   init/Kconfig        | 3 +--
> >   5 files changed, 1 insertion(+), 22 deletions(-)
> >
> > diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
> > index 9ece111b0254..b4f0e37b83eb 100644
> > --- a/arch/sh/Kconfig
> > +++ b/arch/sh/Kconfig
> > @@ -87,11 +87,6 @@ config SUPERH64
> >       select HAVE_EXIT_THREAD
> >       select KALLSYMS
> >
> > -config ARCH_DEFCONFIG
> > -     string
> > -     default "arch/sh/configs/shx3_defconfig" if SUPERH32
> > -     default "arch/sh/configs/cayman_defconfig" if SUPERH64
> > -
> >   config GENERIC_BUG
> >       def_bool y
> >       depends on BUG && SUPERH32
> > diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
> > index c1dd6dd642f4..0de15380d1fc 100644
> > --- a/arch/sparc/Kconfig
> > +++ b/arch/sparc/Kconfig
> > @@ -95,11 +95,6 @@ config SPARC64
> >       select PCI_DOMAINS if PCI
> >       select ARCH_HAS_GIGANTIC_PAGE
> >
> > -config ARCH_DEFCONFIG
> > -     string
> > -     default "arch/sparc/configs/sparc32_defconfig" if SPARC32
> > -     default "arch/sparc/configs/sparc64_defconfig" if SPARC64
> > -
> >   config ARCH_PROC_KCORE_TEXT
> >       def_bool y
> >
> > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> > index beea77046f9b..98935f4387f9 100644
> > --- a/arch/x86/Kconfig
> > +++ b/arch/x86/Kconfig
> > @@ -240,11 +240,6 @@ config OUTPUT_FORMAT
> >       default "elf32-i386" if X86_32
> >       default "elf64-x86-64" if X86_64
> >
> > -config ARCH_DEFCONFIG
> > -     string
> > -     default "arch/x86/configs/i386_defconfig" if X86_32
> > -     default "arch/x86/configs/x86_64_defconfig" if X86_64
> > -
> >   config LOCKDEP_SUPPORT
> >       def_bool y
> >
> > diff --git a/arch/x86/um/Kconfig b/arch/x86/um/Kconfig
> > index a8985e1f7432..95d26a69088b 100644
> > --- a/arch/x86/um/Kconfig
> > +++ b/arch/x86/um/Kconfig
> > @@ -27,11 +27,6 @@ config X86_64
> >       def_bool 64BIT
> >       select MODULES_USE_ELF_RELA
> >
> > -config ARCH_DEFCONFIG
> > -     string
> > -     default "arch/um/configs/i386_defconfig" if X86_32
> > -     default "arch/um/configs/x86_64_defconfig" if X86_64
> > -
> >   config 3_LEVEL_PGTABLES
> >       bool "Three-level pagetables" if !64BIT
> >       default 64BIT
> > diff --git a/init/Kconfig b/init/Kconfig
> > index 452bc1835cd4..6ccdb168dee5 100644
> > --- a/init/Kconfig
> > +++ b/init/Kconfig
> > @@ -6,8 +6,7 @@ config DEFCONFIG_LIST
> >       default "/lib/modules/$(shell,uname -r)/.config"
> >       default "/etc/kernel-config"
> >       default "/boot/config-$(shell,uname -r)"
> > -     default ARCH_DEFCONFIG
> > -     default "arch/$(ARCH)/defconfig"
> > +     default "arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)"
> >
> >   config CC_IS_GCC
> >       def_bool $(success,$(CC) --version | head -n 1 | grep -q gcc)
>
> Best regards
> --
> Marek Szyprowski, PhD
> Samsung R&D Institute Poland
>


-- 
Best Regards
Masahiro Yamada

Re: [PATCH] kbuild: use KBUILD_DEFCONFIG as the fallback for DEFCONFIG_LIST

[Will Deacon]

On Fri, Feb 21, 2020 at 06:18:50PM +0900, Masahiro Yamada wrote:
> On Fri, Feb 21, 2020 at 5:50 PM Marek Szyprowski
> <m.szyprowski@samsung.com> wrote:
> > This patch landed in today's linux-next (next-20200221) and broke arm64
> > builds:
> >
> > --->8---
> >
> > $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- defconfig
> > *** Default configuration is based on 'defconfig'
> > #
> > # configuration written to .config
> > #
> > $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- Image.gz
> > scripts/kconfig/conf  --syncconfig Kconfig
> > scripts/kconfig/conf  --syncconfig Kconfig
> > scripts/kconfig/conf  --syncconfig Kconfig
> > scripts/kconfig/conf  --syncconfig Kconfig
> > scripts/kconfig/conf  --syncconfig Kconfig
> > ...
> >
> > (endless loop)
> >
> > --->8---
> >
> > Reverting it fixes the issue:
> 
> 
> 
> My bad.
> 
> This is because arch/arm64/Makefile does not define
> KBUILD_DEFCONFIG.
> 
> 
> 
> I will drop it.
> 
> Sorry about that.

Thanks, Masahiro.

Will