mirror of
https://github.com/torvalds/linux.git
synced 2024-11-10 22:21:40 +00:00
72d091846d
scripts/pahole-flags.sh is executed so many times.
You can confirm it, as follows:
$ cat <<EOF >> scripts/pahole-flags.sh
> echo "scripts/pahole-flags.sh was executed" >&2
> EOF
$ make -s
scripts/pahole-flags.sh was executed
scripts/pahole-flags.sh was executed
scripts/pahole-flags.sh was executed
scripts/pahole-flags.sh was executed
scripts/pahole-flags.sh was executed
[ lots of repeated lines... ]
This scripts is executed more than 20 times during the kernel build
because PAHOLE_FLAGS is a recursively expanded variable and exported
to sub-processes.
With GNU Make >= 4.4, it is executed more than 60 times because
exported variables are also passed to other $(shell ) invocations.
Without careful coding, it is known to cause an exponential fork
explosion. [1]
The use of $(shell ) in an exported recursive variable is likely wrong
because $(shell ) is always evaluated due to the 'export' keyword, and
the evaluation can occur multiple times by the nature of recursive
variables.
Convert the shell script to a Makefile, which is included only when
CONFIG_DEBUG_INFO_BTF=y.
[1]: https://savannah.gnu.org/bugs/index.php?64746
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Alan Maguire <alan.maguire@oracle.com>
Tested-by: Alan Maguire <alan.maguire@oracle.com>
Reviewed-by: Nicolas Schier <n.schier@avm.de>
Tested-by: Miguel Ojeda <ojeda@kernel.org>
Acked-by: Miguel Ojeda <ojeda@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
20 lines
638 B
Makefile
20 lines
638 B
Makefile
# SPDX-License-Identifier: GPL-2.0
|
|
|
|
pahole-ver := $(CONFIG_PAHOLE_VERSION)
|
|
pahole-flags-y :=
|
|
|
|
# pahole 1.18 through 1.21 can't handle zero-sized per-CPU vars
|
|
ifeq ($(call test-le, $(pahole-ver), 121),y)
|
|
pahole-flags-$(call test-ge, $(pahole-ver), 118) += --skip_encoding_btf_vars
|
|
endif
|
|
|
|
pahole-flags-$(call test-ge, $(pahole-ver), 121) += --btf_gen_floats
|
|
|
|
pahole-flags-$(call test-ge, $(pahole-ver), 122) += -j
|
|
|
|
pahole-flags-$(CONFIG_PAHOLE_HAS_LANG_EXCLUDE) += --lang_exclude=rust
|
|
|
|
pahole-flags-$(call test-ge, $(pahole-ver), 125) += --skip_encoding_btf_inconsistent_proto --btf_gen_optimized
|
|
|
|
export PAHOLE_FLAGS := $(pahole-flags-y)
|