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author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2017-11-13 19:29:34 +0900 |
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committer | Masahiro Yamada <yamada.masahiro@socionext.com> | 2017-11-16 09:07:32 +0900 |
commit | 9a234a2e384349f21afac8d718aa294a668ad4fa (patch) | |
tree | 43d0b8a9ca7c6aa953a0bf849e457813e3892108 /crypto/ghash-generic.c | |
parent | 859fd5860cd1bbbd0370ba4f20725999681b66c8 (diff) | |
download | lwn-9a234a2e384349f21afac8d718aa294a668ad4fa.tar.gz lwn-9a234a2e384349f21afac8d718aa294a668ad4fa.zip |
kbuild: create directory for make cache only when necessary
Currently, the existence of $(dir $(make-cache)) is always checked,
and created if it is missing.
We can avoid unnecessary system calls by some tricks.
[1] If KBUILD_SRC is unset, we are building in the source tree.
The output directory checks can be entirely skipped.
[2] If at least one cache data is found, it means the cache file
was included. Obviously its directory exists. Skip "mkdir -p".
[3] If Makefile does not contain any call of __run-and-store, it will
not create a cache file. No need to create its directory.
[4] The "mkdir -p" should be only invoked by the first call of
__run-and-store
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Diffstat (limited to 'crypto/ghash-generic.c')
0 files changed, 0 insertions, 0 deletions