* [PATCH v2 1/2] kbuild: replace AS=clang with LLVM_IA=1
@ 2020-04-07 18:43 Masahiro Yamada
2020-04-07 18:43 ` [PATCH v2 2/2] kbuild: support LLVM=1 to switch the default tools to Clang/LLVM Masahiro Yamada
` (2 more replies)
0 siblings, 3 replies; 5+ messages in thread
From: Masahiro Yamada @ 2020-04-07 18:43 UTC (permalink / raw)
To: linux-kbuild
Cc: clang-built-linux, Masahiro Yamada, Jonathan Corbet,
Michal Marek, linux-doc, linux-kernel
The 'AS' variable is unused for building the kernel. Only the remaining
usage is to turn on the integrated assembler. A boolean flag is a better
fit for this purpose.
AS=clang was added for experts. So, I replaced it with LLVM_IA=1,
breaking the backward compatibility.
Suggested-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---
Changes in v2:
- new patch
Documentation/kbuild/llvm.rst | 5 ++++-
Makefile | 2 +-
2 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/Documentation/kbuild/llvm.rst b/Documentation/kbuild/llvm.rst
index eefbdfa3e4d9..2b40afa58049 100644
--- a/Documentation/kbuild/llvm.rst
+++ b/Documentation/kbuild/llvm.rst
@@ -50,11 +50,14 @@ LLVM Utilities
LLVM has substitutes for GNU binutils utilities. These can be invoked as
additional parameters to `make`.
- make CC=clang AS=clang LD=ld.lld AR=llvm-ar NM=llvm-nm STRIP=llvm-strip \\
+ make CC=clang LD=ld.lld AR=llvm-ar NM=llvm-nm STRIP=llvm-strip \\
OBJCOPY=llvm-objcopy OBJDUMP=llvm-objdump OBJSIZE=llvm-size \\
READELF=llvm-readelf HOSTCC=clang HOSTCXX=clang++ HOSTAR=llvm-ar \\
HOSTLD=ld.lld
+Currently, the integrated assembler is disabled by default. You can pass
+LLVM_IA=1 to enable it.
+
Getting Help
------------
diff --git a/Makefile b/Makefile
index 1b2691057cb5..f9beb696d6d3 100644
--- a/Makefile
+++ b/Makefile
@@ -538,7 +538,7 @@ endif
ifneq ($(GCC_TOOLCHAIN),)
CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
endif
-ifeq ($(if $(AS),$(shell $(AS) --version 2>&1 | head -n 1 | grep clang)),)
+ifneq ($(LLVM_IA),1)
CLANG_FLAGS += -no-integrated-as
endif
CLANG_FLAGS += -Werror=unknown-warning-option
--
2.17.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH v2 2/2] kbuild: support LLVM=1 to switch the default tools to Clang/LLVM
2020-04-07 18:43 [PATCH v2 1/2] kbuild: replace AS=clang with LLVM_IA=1 Masahiro Yamada
@ 2020-04-07 18:43 ` Masahiro Yamada
2020-04-07 20:39 ` Nick Desaulniers
2020-04-07 18:45 ` [PATCH v2 1/2] kbuild: replace AS=clang with LLVM_IA=1 Nathan Chancellor
2020-04-07 19:03 ` Nick Desaulniers
2 siblings, 1 reply; 5+ messages in thread
From: Masahiro Yamada @ 2020-04-07 18:43 UTC (permalink / raw)
To: linux-kbuild
Cc: clang-built-linux, Masahiro Yamada, Jonathan Corbet,
Josh Poimboeuf, Michal Marek, Peter Zijlstra, linux-doc,
linux-kernel
As Documentation/kbuild/llvm.rst implies, building the kernel with a
full set of LLVM tools gets very verbose and unwieldy.
Provide a single switch LLVM=1 to use Clang and LLVM tools instead
of GCC and Binutils. You can pass it from the command line or as an
environment variable.
Please note LLVM=1 does not turn on the integrated assembler. You need
to pass LLVM_IA=1 to use it. When the upstream kernel is ready for the
integrated assembler, I think we can make it default.
We discussed what we need, and we agreed to go with a simple boolean
flag that switches both target and host tools:
https://lkml.org/lkml/2020/3/28/494
https://lkml.org/lkml/2020/4/3/43
Some items discussed, but not adopted:
- LLVM_DIR
When multiple versions of LLVM are installed, I just thought supporting
LLVM_DIR=/path/to/my/llvm/bin/ might be useful.
CC = $(LLVM_DIR)clang
LD = $(LLVM_DIR)ld.lld
...
However, we can handle this by modifying PATH. So, we decided to not do
this.
- LLVM_SUFFIX
Some distributions (e.g. Debian) package specific versions of LLVM with
naming conventions that use the version as a suffix.
CC = clang$(LLVM_SUFFIX)
LD = ld.lld(LLVM_SUFFIX)
...
will allow a user to pass LLVM_SUFFIX=-11 to use clang-11 etc.,
but the suffixed versions in /usr/bin/ are symlinks to binaries in
/usr/lib/llvm-#/bin/, so this can also be handled by PATH.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Tested-by: Nathan Chancellor <natechancellor@gmail.com> # build
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
---
Changes in v2:
- Switch host compilers as well as requested
Documentation/kbuild/kbuild.rst | 5 +++++
Documentation/kbuild/llvm.rst | 8 ++++++--
Makefile | 29 +++++++++++++++++++++++------
tools/objtool/Makefile | 6 ++++++
4 files changed, 40 insertions(+), 8 deletions(-)
diff --git a/Documentation/kbuild/kbuild.rst b/Documentation/kbuild/kbuild.rst
index 510f38d7e78a..2d1fc03d346e 100644
--- a/Documentation/kbuild/kbuild.rst
+++ b/Documentation/kbuild/kbuild.rst
@@ -262,3 +262,8 @@ KBUILD_BUILD_USER, KBUILD_BUILD_HOST
These two variables allow to override the user@host string displayed during
boot and in /proc/version. The default value is the output of the commands
whoami and host, respectively.
+
+LLVM
+----
+If this variable is set to 1, Kbuild will use Clang and LLVM utilities instead
+of GCC and GNU binutils to build the kernel.
diff --git a/Documentation/kbuild/llvm.rst b/Documentation/kbuild/llvm.rst
index 2b40afa58049..81f915c02c4c 100644
--- a/Documentation/kbuild/llvm.rst
+++ b/Documentation/kbuild/llvm.rst
@@ -47,8 +47,12 @@ example:
LLVM Utilities
--------------
-LLVM has substitutes for GNU binutils utilities. These can be invoked as
-additional parameters to `make`.
+LLVM has substitutes for GNU binutils utilities. Kbuild supports `LLVM=1`
+to enable them.
+
+ make LLVM=1
+
+They can be enabled individually. The full list of the parameters:
make CC=clang LD=ld.lld AR=llvm-ar NM=llvm-nm STRIP=llvm-strip \\
OBJCOPY=llvm-objcopy OBJDUMP=llvm-objdump OBJSIZE=llvm-size \\
diff --git a/Makefile b/Makefile
index f9beb696d6d3..ffc1d2c618a7 100644
--- a/Makefile
+++ b/Makefile
@@ -399,8 +399,13 @@ HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
-HOSTCC = gcc
-HOSTCXX = g++
+ifneq ($(LLVM),)
+HOSTCC = clang
+HOSTCXX = clang++
+else
+HOSTCC = gcc
+HOSTCXX = g++
+endif
KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
-fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
$(HOSTCFLAGS)
@@ -409,16 +414,28 @@ KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
# Make variables (CC, etc...)
-LD = $(CROSS_COMPILE)ld
-CC = $(CROSS_COMPILE)gcc
CPP = $(CC) -E
+ifneq ($(LLVM),)
+CC = clang
+LD = ld.lld
+AR = llvm-ar
+NM = llvm-nm
+OBJCOPY = llvm-objcopy
+OBJDUMP = llvm-objdump
+READELF = llvm-readelf
+OBJSIZE = llvm-size
+STRIP = llvm-strip
+else
+CC = $(CROSS_COMPILE)gcc
+LD = $(CROSS_COMPILE)ld
AR = $(CROSS_COMPILE)ar
NM = $(CROSS_COMPILE)nm
-STRIP = $(CROSS_COMPILE)strip
OBJCOPY = $(CROSS_COMPILE)objcopy
OBJDUMP = $(CROSS_COMPILE)objdump
-OBJSIZE = $(CROSS_COMPILE)size
READELF = $(CROSS_COMPILE)readelf
+OBJSIZE = $(CROSS_COMPILE)size
+STRIP = $(CROSS_COMPILE)strip
+endif
PAHOLE = pahole
LEX = flex
YACC = bison
diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
index ee08aeff30a1..f591c4d1b6fe 100644
--- a/tools/objtool/Makefile
+++ b/tools/objtool/Makefile
@@ -3,9 +3,15 @@ include ../scripts/Makefile.include
include ../scripts/Makefile.arch
# always use the host compiler
+ifneq ($(LLVM),)
+HOSTAR ?= llvm-ar
+HOSTCC ?= clang
+HOSTLD ?= ld.lld
+else
HOSTAR ?= ar
HOSTCC ?= gcc
HOSTLD ?= ld
+endif
AR = $(HOSTAR)
CC = $(HOSTCC)
LD = $(HOSTLD)
--
2.17.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v2 1/2] kbuild: replace AS=clang with LLVM_IA=1
2020-04-07 18:43 [PATCH v2 1/2] kbuild: replace AS=clang with LLVM_IA=1 Masahiro Yamada
2020-04-07 18:43 ` [PATCH v2 2/2] kbuild: support LLVM=1 to switch the default tools to Clang/LLVM Masahiro Yamada
@ 2020-04-07 18:45 ` Nathan Chancellor
2020-04-07 19:03 ` Nick Desaulniers
2 siblings, 0 replies; 5+ messages in thread
From: Nathan Chancellor @ 2020-04-07 18:45 UTC (permalink / raw)
To: Masahiro Yamada
Cc: linux-kbuild, clang-built-linux, Jonathan Corbet, Michal Marek,
linux-doc, linux-kernel
On Wed, Apr 08, 2020 at 03:43:35AM +0900, Masahiro Yamada wrote:
> The 'AS' variable is unused for building the kernel. Only the remaining
> usage is to turn on the integrated assembler. A boolean flag is a better
> fit for this purpose.
>
> AS=clang was added for experts. So, I replaced it with LLVM_IA=1,
> breaking the backward compatibility.
>
> Suggested-by: Nick Desaulniers <ndesaulniers@google.com>
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v2 1/2] kbuild: replace AS=clang with LLVM_IA=1
2020-04-07 18:43 [PATCH v2 1/2] kbuild: replace AS=clang with LLVM_IA=1 Masahiro Yamada
2020-04-07 18:43 ` [PATCH v2 2/2] kbuild: support LLVM=1 to switch the default tools to Clang/LLVM Masahiro Yamada
2020-04-07 18:45 ` [PATCH v2 1/2] kbuild: replace AS=clang with LLVM_IA=1 Nathan Chancellor
@ 2020-04-07 19:03 ` Nick Desaulniers
2 siblings, 0 replies; 5+ messages in thread
From: Nick Desaulniers @ 2020-04-07 19:03 UTC (permalink / raw)
To: Masahiro Yamada
Cc: Linux Kbuild mailing list, clang-built-linux, Jonathan Corbet,
Michal Marek, Linux Doc Mailing List, LKML
On Tue, Apr 7, 2020 at 11:44 AM Masahiro Yamada <masahiroy@kernel.org> wrote:
>
> The 'AS' variable is unused for building the kernel. Only the remaining
> usage is to turn on the integrated assembler. A boolean flag is a better
> fit for this purpose.
>
> AS=clang was added for experts. So, I replaced it with LLVM_IA=1,
> breaking the backward compatibility.
>
> Suggested-by: Nick Desaulniers <ndesaulniers@google.com>
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Thank you for this series!
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
> ---
>
> Changes in v2:
> - new patch
>
> Documentation/kbuild/llvm.rst | 5 ++++-
> Makefile | 2 +-
> 2 files changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/kbuild/llvm.rst b/Documentation/kbuild/llvm.rst
> index eefbdfa3e4d9..2b40afa58049 100644
> --- a/Documentation/kbuild/llvm.rst
> +++ b/Documentation/kbuild/llvm.rst
> @@ -50,11 +50,14 @@ LLVM Utilities
> LLVM has substitutes for GNU binutils utilities. These can be invoked as
> additional parameters to `make`.
>
> - make CC=clang AS=clang LD=ld.lld AR=llvm-ar NM=llvm-nm STRIP=llvm-strip \\
> + make CC=clang LD=ld.lld AR=llvm-ar NM=llvm-nm STRIP=llvm-strip \\
> OBJCOPY=llvm-objcopy OBJDUMP=llvm-objdump OBJSIZE=llvm-size \\
> READELF=llvm-readelf HOSTCC=clang HOSTCXX=clang++ HOSTAR=llvm-ar \\
> HOSTLD=ld.lld
>
> +Currently, the integrated assembler is disabled by default. You can pass
> +LLVM_IA=1 to enable it.
> +
> Getting Help
> ------------
>
> diff --git a/Makefile b/Makefile
> index 1b2691057cb5..f9beb696d6d3 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -538,7 +538,7 @@ endif
> ifneq ($(GCC_TOOLCHAIN),)
> CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
> endif
> -ifeq ($(if $(AS),$(shell $(AS) --version 2>&1 | head -n 1 | grep clang)),)
> +ifneq ($(LLVM_IA),1)
> CLANG_FLAGS += -no-integrated-as
> endif
> CLANG_FLAGS += -Werror=unknown-warning-option
> --
> 2.17.1
>
> --
> You received this message because you are subscribed to the Google Groups "Clang Built Linux" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to clang-built-linux+unsubscribe@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/clang-built-linux/20200407184336.14612-1-masahiroy%40kernel.org.
--
Thanks,
~Nick Desaulniers
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v2 2/2] kbuild: support LLVM=1 to switch the default tools to Clang/LLVM
2020-04-07 18:43 ` [PATCH v2 2/2] kbuild: support LLVM=1 to switch the default tools to Clang/LLVM Masahiro Yamada
@ 2020-04-07 20:39 ` Nick Desaulniers
0 siblings, 0 replies; 5+ messages in thread
From: Nick Desaulniers @ 2020-04-07 20:39 UTC (permalink / raw)
To: Masahiro Yamada
Cc: Linux Kbuild mailing list, clang-built-linux, Jonathan Corbet,
Josh Poimboeuf, Michal Marek, Peter Zijlstra,
Linux Doc Mailing List, LKML, Matthias Männich,
Sandeep Patil
On Tue, Apr 7, 2020 at 11:44 AM Masahiro Yamada <masahiroy@kernel.org> wrote:
>
> As Documentation/kbuild/llvm.rst implies, building the kernel with a
> full set of LLVM tools gets very verbose and unwieldy.
>
> Provide a single switch LLVM=1 to use Clang and LLVM tools instead
> of GCC and Binutils. You can pass it from the command line or as an
> environment variable.
>
> Please note LLVM=1 does not turn on the integrated assembler. You need
> to pass LLVM_IA=1 to use it. When the upstream kernel is ready for the
> integrated assembler, I think we can make it default.
>
> We discussed what we need, and we agreed to go with a simple boolean
> flag that switches both target and host tools:
>
> https://lkml.org/lkml/2020/3/28/494
> https://lkml.org/lkml/2020/4/3/43
>
> Some items discussed, but not adopted:
>
> - LLVM_DIR
>
> When multiple versions of LLVM are installed, I just thought supporting
> LLVM_DIR=/path/to/my/llvm/bin/ might be useful.
>
> CC = $(LLVM_DIR)clang
> LD = $(LLVM_DIR)ld.lld
> ...
>
> However, we can handle this by modifying PATH. So, we decided to not do
> this.
>
> - LLVM_SUFFIX
>
> Some distributions (e.g. Debian) package specific versions of LLVM with
> naming conventions that use the version as a suffix.
>
> CC = clang$(LLVM_SUFFIX)
> LD = ld.lld(LLVM_SUFFIX)
> ...
>
> will allow a user to pass LLVM_SUFFIX=-11 to use clang-11 etc.,
> but the suffixed versions in /usr/bin/ are symlinks to binaries in
> /usr/lib/llvm-#/bin/, so this can also be handled by PATH.
>
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
> Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
> Tested-by: Nathan Chancellor <natechancellor@gmail.com> # build
> Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Thanks for the series!
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
> ---
>
> Changes in v2:
> - Switch host compilers as well as requested
>
> Documentation/kbuild/kbuild.rst | 5 +++++
> Documentation/kbuild/llvm.rst | 8 ++++++--
> Makefile | 29 +++++++++++++++++++++++------
> tools/objtool/Makefile | 6 ++++++
> 4 files changed, 40 insertions(+), 8 deletions(-)
>
> diff --git a/Documentation/kbuild/kbuild.rst b/Documentation/kbuild/kbuild.rst
> index 510f38d7e78a..2d1fc03d346e 100644
> --- a/Documentation/kbuild/kbuild.rst
> +++ b/Documentation/kbuild/kbuild.rst
> @@ -262,3 +262,8 @@ KBUILD_BUILD_USER, KBUILD_BUILD_HOST
> These two variables allow to override the user@host string displayed during
> boot and in /proc/version. The default value is the output of the commands
> whoami and host, respectively.
> +
> +LLVM
> +----
> +If this variable is set to 1, Kbuild will use Clang and LLVM utilities instead
> +of GCC and GNU binutils to build the kernel.
> diff --git a/Documentation/kbuild/llvm.rst b/Documentation/kbuild/llvm.rst
> index 2b40afa58049..81f915c02c4c 100644
> --- a/Documentation/kbuild/llvm.rst
> +++ b/Documentation/kbuild/llvm.rst
> @@ -47,8 +47,12 @@ example:
> LLVM Utilities
> --------------
>
> -LLVM has substitutes for GNU binutils utilities. These can be invoked as
> -additional parameters to `make`.
> +LLVM has substitutes for GNU binutils utilities. Kbuild supports `LLVM=1`
> +to enable them.
> +
> + make LLVM=1
> +
> +They can be enabled individually. The full list of the parameters:
>
> make CC=clang LD=ld.lld AR=llvm-ar NM=llvm-nm STRIP=llvm-strip \\
> OBJCOPY=llvm-objcopy OBJDUMP=llvm-objdump OBJSIZE=llvm-size \\
> diff --git a/Makefile b/Makefile
> index f9beb696d6d3..ffc1d2c618a7 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -399,8 +399,13 @@ HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
> HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
> HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
>
> -HOSTCC = gcc
> -HOSTCXX = g++
> +ifneq ($(LLVM),)
> +HOSTCC = clang
> +HOSTCXX = clang++
> +else
> +HOSTCC = gcc
> +HOSTCXX = g++
> +endif
> KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
> -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
> $(HOSTCFLAGS)
> @@ -409,16 +414,28 @@ KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
> KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
>
> # Make variables (CC, etc...)
> -LD = $(CROSS_COMPILE)ld
> -CC = $(CROSS_COMPILE)gcc
> CPP = $(CC) -E
> +ifneq ($(LLVM),)
> +CC = clang
> +LD = ld.lld
> +AR = llvm-ar
> +NM = llvm-nm
> +OBJCOPY = llvm-objcopy
> +OBJDUMP = llvm-objdump
> +READELF = llvm-readelf
> +OBJSIZE = llvm-size
> +STRIP = llvm-strip
> +else
> +CC = $(CROSS_COMPILE)gcc
> +LD = $(CROSS_COMPILE)ld
> AR = $(CROSS_COMPILE)ar
> NM = $(CROSS_COMPILE)nm
> -STRIP = $(CROSS_COMPILE)strip
> OBJCOPY = $(CROSS_COMPILE)objcopy
> OBJDUMP = $(CROSS_COMPILE)objdump
> -OBJSIZE = $(CROSS_COMPILE)size
> READELF = $(CROSS_COMPILE)readelf
> +OBJSIZE = $(CROSS_COMPILE)size
> +STRIP = $(CROSS_COMPILE)strip
> +endif
> PAHOLE = pahole
> LEX = flex
> YACC = bison
> diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
> index ee08aeff30a1..f591c4d1b6fe 100644
> --- a/tools/objtool/Makefile
> +++ b/tools/objtool/Makefile
> @@ -3,9 +3,15 @@ include ../scripts/Makefile.include
> include ../scripts/Makefile.arch
>
> # always use the host compiler
> +ifneq ($(LLVM),)
> +HOSTAR ?= llvm-ar
> +HOSTCC ?= clang
> +HOSTLD ?= ld.lld
> +else
> HOSTAR ?= ar
> HOSTCC ?= gcc
> HOSTLD ?= ld
> +endif
> AR = $(HOSTAR)
> CC = $(HOSTCC)
> LD = $(HOSTLD)
> --
--
Thanks,
~Nick Desaulniers
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2020-04-07 20:45 UTC | newest]
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2020-04-07 18:43 [PATCH v2 1/2] kbuild: replace AS=clang with LLVM_IA=1 Masahiro Yamada
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2020-04-07 20:39 ` Nick Desaulniers
2020-04-07 18:45 ` [PATCH v2 1/2] kbuild: replace AS=clang with LLVM_IA=1 Nathan Chancellor
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