2016-09-19 08:07:56 -03:00
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2016-10-26 16:34:09 -06:00
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2016-09-19 08:07:42 -03:00
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2005-04-16 15:20:36 -07:00
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2022-04-19 11:48:52 -03:00
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2005-04-16 15:20:36 -07:00
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2016-09-19 08:07:42 -03:00
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2005-04-16 15:20:36 -07:00
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2016-09-19 08:07:42 -03:00
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2005-04-16 15:20:36 -07:00
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2011-07-11 16:48:38 -07:00
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2019-04-18 22:43:36 +02:00
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2005-04-16 15:20:36 -07:00
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2016-09-19 08:07:42 -03:00
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2021-09-10 16:40:38 -07:00
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Documentation: Raise the minimum supported version of LLVM to 11.0.0
LLVM versions prior to 11.0.0 have a harder time with dead code
elimination, which can cause issues with commonly used expressions such
as BUILD_BUG_ON and the bitmask functions/macros in bitfield.h (see the
first two issues links below).
Whenever there is an issue within LLVM that has been resolved in a later
release, the only course of action is to gate the problematic
configuration or source code on the toolchain verson or raise the
minimum supported version of LLVM for building the kernel, as LLVM has a
limited support lifetime compared to GCC. GCC major releases will
typically see a few point releases across a two year period on average
whereas LLVM major releases are only supported until the next major
release and will only see one or two point releases within that
timeframe. For example, GCC 8.1 was released in May 2018 and GCC 8.5 was
released in May 2021, whereas LLVM 12.0.0 was released in April 2021 and
its only point release, 12.0.1, was released in July 2021, giving a
minimal window for fixes to be backported.
To resolve these build errors around improper dead code elimination,
raise the minimum supported version of LLVM for building the kernel to
11.0.0. Doing so is a more proper solution than mucking around with core
kernel macros that have always worked with GCC or disabling drivers for
using these macros in a proper manner. This type of issue may continue
to crop up and require patching, which creates more debt for bumping the
minimum supported version in the future.
This should have a minimal impact to distributions. Using a script to
pull several different Docker images and check the output of
'clang --version':
archlinux:latest: clang version 13.0.0
debian:oldoldstable-slim: clang version 3.8.1-24 (tags/RELEASE_381/final)
debian:oldstable-slim: clang version 7.0.1-8+deb10u2 (tags/RELEASE_701/final)
debian:stable-slim: Debian clang version 11.0.1-2
debian:testing-slim: Debian clang version 11.1.0-4
debian:unstable-slim: Debian clang version 11.1.0-4
fedora:34: clang version 12.0.1 (Fedora 12.0.1-1.fc34)
fedora:latest: clang version 13.0.0 (Fedora 13.0.0-3.fc35)
fedora:rawhide: clang version 13.0.0 (Fedora 13.0.0-5.fc36)
opensuse/leap:15.2: clang version 9.0.1
opensuse/leap:latest: clang version 11.0.1
opensuse/tumbleweed:latest: clang version 13.0.0
ubuntu:bionic: clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)
ubuntu:latest: clang version 10.0.0-4ubuntu1
ubuntu:hirsute: Ubuntu clang version 12.0.0-3ubuntu1~21.04.2
ubuntu:rolling: Ubuntu clang version 13.0.0-2
ubuntu:devel: Ubuntu clang version 13.0.0-9
In every case, the distribution's version of clang is either older than
the current minimum supported version of LLVM 10.0.1 or equal to or
greater than the proposed 11.0.0 so nothing should change.
Another benefit of this change is LLVM=1 works better with arm64 and
x86_64 since commit f12b034afeb3 ("scripts/Makefile.clang: default to
LLVM_IAS=1") enabled the integrated assembler by default, which only
works well with clang 11+ (clang-10 required it to be disabled to
successfully build a kernel).
Link: https://github.com/ClangBuiltLinux/linux/issues/1293
Link: https://github.com/ClangBuiltLinux/linux/issues/1506
Link: https://github.com/ClangBuiltLinux/linux/issues/1511
Link: https://github.com/llvm/llvm-project/commit/fa496ce3c6774097080c8a9cb808da56f383b938
Link: https://groups.google.com/g/clang-built-linux/c/mPQb9_ZWW0s/m/W7o6S-QTBAAJ
Link: https://github.com/ClangBuiltLinux/misc-scripts
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Miguel Ojeda <ojeda@kernel.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2021-11-29 09:57:58 -07:00
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2021-07-03 17:23:16 +02:00
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2022-10-02 05:28:35 +09:00
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scripts/check-local-export: avoid 'wait $!' for process substitution
Bash 4.4, released in 2016, supports 'wait $!' to check the exit status
of a process substitution, but it seems too new.
Some people using older bash versions (on CentOS 7, Ubuntu 16.04, etc.)
reported an error like this:
./scripts/check-local-export: line 54: wait: pid 17328 is not a child of this shell
I used the process substitution to avoid a pipeline, which executes each
command in a subshell. If the while-loop is executed in the subshell
context, variable changes within are lost after the subshell terminates.
Fortunately, Bash 4.2, released in 2011, supports the 'lastpipe' option,
which makes the last element of a pipeline run in the current shell process.
Switch to the pipeline with 'lastpipe' solution, and also set 'pipefail'
to catch errors from ${NM}.
Add the bash requirement to Documentation/process/changes.rst.
Fixes: 31cb50b5590f ("kbuild: check static EXPORT_SYMBOL* by script instead of modpost")
Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reported-by: Michael Ellerman <mpe@ellerman.id.au>
Reported-by: Wang Yugui <wangyugui@e16-tech.com>
Tested-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Acked-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # LLVM-14 (x86-64)
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2022-06-08 10:11:00 +09:00
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2020-03-26 17:01:02 +09:00
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kbuild: prepare to remove C files pre-generated by flex and bison
In Linux build system convention, pre-generated files are version-
controlled with a "_shipped" suffix. During the kernel building,
they are simply shipped (copied) removing the suffix.
This approach can reduce external tool dependency for the kernel build,
but it is tedious to manually regenerate such artifacts from developers'
point of view. (We need to do "make REGENERATE_PARSERS=1" every time
we touch real source files such as *.l, *.y)
Some months ago, I sent out RFC patches to run flex, bison, and gperf
during the build.
In the review and test, Linus noticed gperf-3.1 had changed the lookup
function prototype. Then, the use of gperf in kernel was entirely
removed by commit bb3290d91695 ("Remove gperf usage from toolchain").
This time, I tested several versions of flex and bison, and I was not
hit by any compatibility issue except a flaw in flex-2.6.3; if you
generate lexer for dtc and genksyms with flex-2.6.3, you will see
"yywrap redefined" warning. This was not intentional, but a bug,
fixed by flex-2.6.4. Otherwise, both flex and bison look fairly
stable for a long time.
This commit prepares some build rules to remove the _shipped files.
Also, document minimal requirement for flex and bison.
Rationale for the minimal version:
The -Wmissing-prototypes option of GCC warns "no previous prototype"
for lexers generated by flex-2.5.34 or older, so I chose 2.5.35 as the
required version for flex. Flex-2.5.35 was released in 2008. Bison
looks more stable. I did not see any problem with bison-2.0, released
in 2004. I did not test bison-1.x, but bison-2.0 should be old enough.
Tested flex versions:
2.5.35
2.5.36
2.5.37
2.5.39
2.6.0
2.6.1
2.6.2
2.6.3 (*)
2.6.4
(*) flex-2.6.3 causes "yywrap redefined" warning
Tested bison versions:
2.0
2.1
2.2
2.3
2.4
2.4.1
2.5.1
2.6
2.6.1
2.6.2
2.6.3
2.6.4
2.6.5
2.7
2.7.1
3.0
3.0.1
3.0.2
3.0.3
3.0.4
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2017-12-10 01:02:29 +09:00
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2021-11-19 15:56:03 -03:00
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2016-09-19 08:07:42 -03:00
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2018-07-01 19:46:06 -07:00
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2016-09-19 08:07:42 -03:00
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2021-11-10 18:16:48 +09:00
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2022-04-19 11:48:15 -03:00
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2016-09-19 08:07:42 -03:00
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2009-12-14 14:52:10 +01:00
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2016-09-19 08:07:43 -03:00
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2005-04-16 15:20:36 -07:00
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2016-09-19 08:07:42 -03:00
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2005-04-16 15:20:36 -07:00
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2006-01-08 01:04:09 -08:00
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2005-04-16 15:20:36 -07:00
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2020-08-26 12:15:55 -07:00
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2021-07-03 17:23:16 +02:00
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2005-04-16 15:20:36 -07:00
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2022-10-02 05:28:35 +09:00
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2005-04-16 15:20:36 -07:00
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scripts/check-local-export: avoid 'wait $!' for process substitution
Bash 4.4, released in 2016, supports 'wait $!' to check the exit status
of a process substitution, but it seems too new.
Some people using older bash versions (on CentOS 7, Ubuntu 16.04, etc.)
reported an error like this:
./scripts/check-local-export: line 54: wait: pid 17328 is not a child of this shell
I used the process substitution to avoid a pipeline, which executes each
command in a subshell. If the while-loop is executed in the subshell
context, variable changes within are lost after the subshell terminates.
Fortunately, Bash 4.2, released in 2011, supports the 'lastpipe' option,
which makes the last element of a pipeline run in the current shell process.
Switch to the pipeline with 'lastpipe' solution, and also set 'pipefail'
to catch errors from ${NM}.
Add the bash requirement to Documentation/process/changes.rst.
Fixes: 31cb50b5590f ("kbuild: check static EXPORT_SYMBOL* by script instead of modpost")
Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reported-by: Michael Ellerman <mpe@ellerman.id.au>
Reported-by: Wang Yugui <wangyugui@e16-tech.com>
Tested-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Acked-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # LLVM-14 (x86-64)
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2022-06-08 10:11:00 +09:00
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2005-04-16 15:20:36 -07:00
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2020-03-26 17:01:02 +09:00
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2005-04-16 15:20:36 -07:00
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2018-06-28 16:39:50 -07:00
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kconfig: do not require pkg-config on make {menu,n}config
Meelis Roos reported a {menu,n}config regression:
"I have libncurses devel package installed in the default system
location (as do 99%+ on actual developers probably) and in this
case, pkg-config is useless. pkg-config is needed only when
libraries and headers are installed in non-default locations but
it is bad to require installation of pkg-config on all the machines
where make menuconfig would be possibly run."
For {menu,n}config, do not use pkg-config if it is not installed.
For {g,x}config, keep checking pkg-config since we really rely on it
for finding the installation paths of the required packages.
Fixes: 4ab3b80159d4 ("kconfig: check for pkg-config on make {menu,n,g,x}config")
Reported-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Tested-by: Meelis Roos <mroos@linux.ee>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
2018-08-31 18:34:55 +09:00
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2018-06-28 16:39:50 -07:00
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kbuild: prepare to remove C files pre-generated by flex and bison
In Linux build system convention, pre-generated files are version-
controlled with a "_shipped" suffix. During the kernel building,
they are simply shipped (copied) removing the suffix.
This approach can reduce external tool dependency for the kernel build,
but it is tedious to manually regenerate such artifacts from developers'
point of view. (We need to do "make REGENERATE_PARSERS=1" every time
we touch real source files such as *.l, *.y)
Some months ago, I sent out RFC patches to run flex, bison, and gperf
during the build.
In the review and test, Linus noticed gperf-3.1 had changed the lookup
function prototype. Then, the use of gperf in kernel was entirely
removed by commit bb3290d91695 ("Remove gperf usage from toolchain").
This time, I tested several versions of flex and bison, and I was not
hit by any compatibility issue except a flaw in flex-2.6.3; if you
generate lexer for dtc and genksyms with flex-2.6.3, you will see
"yywrap redefined" warning. This was not intentional, but a bug,
fixed by flex-2.6.4. Otherwise, both flex and bison look fairly
stable for a long time.
This commit prepares some build rules to remove the _shipped files.
Also, document minimal requirement for flex and bison.
Rationale for the minimal version:
The -Wmissing-prototypes option of GCC warns "no previous prototype"
for lexers generated by flex-2.5.34 or older, so I chose 2.5.35 as the
required version for flex. Flex-2.5.35 was released in 2008. Bison
looks more stable. I did not see any problem with bison-2.0, released
in 2004. I did not test bison-1.x, but bison-2.0 should be old enough.
Tested flex versions:
2.5.35
2.5.36
2.5.37
2.5.39
2.6.0
2.6.1
2.6.2
2.6.3 (*)
2.6.4
(*) flex-2.6.3 causes "yywrap redefined" warning
Tested bison versions:
2.0
2.1
2.2
2.3
2.4
2.4.1
2.5.1
2.6
2.6.1
2.6.2
2.6.3
2.6.4
2.6.5
2.7
2.7.1
3.0
3.0.1
3.0.2
3.0.3
3.0.4
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2017-12-10 01:02:29 +09:00
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2021-11-19 15:56:03 -03:00
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2009-06-17 16:26:30 -07:00
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2016-09-19 08:07:42 -03:00
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2009-06-17 16:26:30 -07:00
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2014-05-19 14:02:17 +01:00
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2009-06-17 16:26:30 -07:00
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2015-08-27 11:13:36 +01:00
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2005-04-16 15:20:36 -07:00
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2016-09-19 08:07:42 -03:00
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2005-04-16 15:20:36 -07:00
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2020-06-21 15:36:30 +02:00
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2005-04-16 15:20:36 -07:00
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2017-05-14 11:50:11 -03:00
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2005-04-16 15:20:36 -07:00
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2016-09-19 08:07:42 -03:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 01:01:03 -08:00
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2016-09-19 08:07:42 -03:00
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2011-07-11 16:48:38 -07:00
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2016-09-19 08:07:42 -03:00
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2011-07-11 16:48:38 -07:00
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2005-04-16 15:20:36 -07:00
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2006-11-30 05:32:19 +01:00
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2011-07-11 16:48:38 -07:00
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2011-07-11 16:48:38 -07:00
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2016-09-19 08:07:42 -03:00
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2011-07-11 16:48:38 -07:00
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2005-04-16 15:20:36 -07:00
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2016-09-20 18:46:36 -06:00
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2006-09-11 12:39:19 -04:00
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2005-04-16 15:20:36 -07:00
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2009-04-28 23:37:02 +02:00
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2014-07-12 09:54:52 -07:00
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2016-09-19 08:07:42 -03:00
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2009-04-28 23:37:02 +02:00
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2018-11-21 01:35:19 +01:00
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2017-07-14 13:41:17 -03:00
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2016-09-19 08:07:43 -03:00
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2021-07-03 17:23:16 +02:00
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2006-01-08 01:04:09 -08:00
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2005-04-16 15:20:36 -07:00
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2020-08-26 12:15:55 -07:00
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2021-07-03 17:23:16 +02:00
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scripts/check-local-export: avoid 'wait $!' for process substitution
Bash 4.4, released in 2016, supports 'wait $!' to check the exit status
of a process substitution, but it seems too new.
Some people using older bash versions (on CentOS 7, Ubuntu 16.04, etc.)
reported an error like this:
./scripts/check-local-export: line 54: wait: pid 17328 is not a child of this shell
I used the process substitution to avoid a pipeline, which executes each
command in a subshell. If the while-loop is executed in the subshell
context, variable changes within are lost after the subshell terminates.
Fortunately, Bash 4.2, released in 2011, supports the 'lastpipe' option,
which makes the last element of a pipeline run in the current shell process.
Switch to the pipeline with 'lastpipe' solution, and also set 'pipefail'
to catch errors from ${NM}.
Add the bash requirement to Documentation/process/changes.rst.
Fixes: 31cb50b5590f ("kbuild: check static EXPORT_SYMBOL* by script instead of modpost")
Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reported-by: Michael Ellerman <mpe@ellerman.id.au>
Reported-by: Wang Yugui <wangyugui@e16-tech.com>
Tested-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Acked-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # LLVM-14 (x86-64)
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2022-06-08 10:11:00 +09:00
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2005-04-16 15:20:36 -07:00
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2016-09-19 08:07:42 -03:00
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2017-03-27 22:05:34 +09:00
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2005-04-16 15:20:36 -07:00
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kbuild: prepare to remove C files pre-generated by flex and bison
In Linux build system convention, pre-generated files are version-
controlled with a "_shipped" suffix. During the kernel building,
they are simply shipped (copied) removing the suffix.
This approach can reduce external tool dependency for the kernel build,
but it is tedious to manually regenerate such artifacts from developers'
point of view. (We need to do "make REGENERATE_PARSERS=1" every time
we touch real source files such as *.l, *.y)
Some months ago, I sent out RFC patches to run flex, bison, and gperf
during the build.
In the review and test, Linus noticed gperf-3.1 had changed the lookup
function prototype. Then, the use of gperf in kernel was entirely
removed by commit bb3290d91695 ("Remove gperf usage from toolchain").
This time, I tested several versions of flex and bison, and I was not
hit by any compatibility issue except a flaw in flex-2.6.3; if you
generate lexer for dtc and genksyms with flex-2.6.3, you will see
"yywrap redefined" warning. This was not intentional, but a bug,
fixed by flex-2.6.4. Otherwise, both flex and bison look fairly
stable for a long time.
This commit prepares some build rules to remove the _shipped files.
Also, document minimal requirement for flex and bison.
Rationale for the minimal version:
The -Wmissing-prototypes option of GCC warns "no previous prototype"
for lexers generated by flex-2.5.34 or older, so I chose 2.5.35 as the
required version for flex. Flex-2.5.35 was released in 2008. Bison
looks more stable. I did not see any problem with bison-2.0, released
in 2004. I did not test bison-1.x, but bison-2.0 should be old enough.
Tested flex versions:
2.5.35
2.5.36
2.5.37
2.5.39
2.6.0
2.6.1
2.6.2
2.6.3 (*)
2.6.4
(*) flex-2.6.3 causes "yywrap redefined" warning
Tested bison versions:
2.0
2.1
2.2
2.3
2.4
2.4.1
2.5.1
2.6
2.6.1
2.6.2
2.6.3
2.6.4
2.6.5
2.7
2.7.1
3.0
3.0.1
3.0.2
3.0.3
3.0.4
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2017-12-10 01:02:29 +09:00
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2015-08-27 11:13:36 +01:00
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2015-08-27 11:13:36 +01:00
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2017-03-27 22:05:34 +09:00
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2005-04-16 15:20:36 -07:00
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2018-07-01 19:46:06 -07:00
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2017-03-27 22:05:34 +09:00
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2005-04-16 15:20:36 -07:00
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2005-04-16 15:20:36 -07:00
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2016-09-19 08:07:42 -03:00
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2020-01-29 15:15:15 -08:00
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2005-04-16 15:20:36 -07:00
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2020-01-29 15:15:15 -08:00
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2005-04-16 15:20:36 -07:00
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2020-01-29 15:15:15 -08:00
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2017-03-27 22:05:34 +09:00
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2005-06-27 16:28:45 -07:00
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2005-05-01 08:59:27 -07:00
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2005-04-16 15:20:36 -07:00
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2016-09-19 08:07:42 -03:00
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2020-06-21 15:36:30 +02:00
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2005-04-16 15:20:36 -07:00
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2005-09-27 21:45:20 -07:00
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2016-09-19 08:07:42 -03:00
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2018-03-27 14:59:50 +02:00
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2005-09-27 21:45:20 -07:00
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2009-04-28 23:37:02 +02:00
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2009-04-28 23:37:02 +02:00
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2022-04-19 11:48:15 -03:00
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2016-09-19 08:07:42 -03:00
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2020-01-29 15:15:15 -08:00
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2005-04-16 15:20:36 -07:00
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2020-06-21 15:36:30 +02:00
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