Commit 987fdfec24 ("arm64: move --fix-cortex-a53-843419 linker test to
Kconfig") fixed the false-positive warning in the installation step.
Yet, there are some cases where this false-positive is shown. For example,
you can see it when you cross 987fdfec24 during git-bisect.
$ git checkout 987fdfec2410^
[ snip ]
$ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- defconfig all
[ snip ]
$ git checkout v5.13
[ snip]
$ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- defconfig all
[ snip ]
arch/arm64/Makefile:25: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum
In the stale include/config/auto.config, CONFIG_ARM64_ERRATUM_843419=y
is set without CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419, so the warning
is displayed while parsing the Makefiles.
Make will restart with the updated include/config/auto.config, hence
CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419 will be set eventually, but
this warning is a surprise for users.
Commit 25896d073d ("x86/build: Fix compiler support check for
CONFIG_RETPOLINE") addressed a similar issue.
Move $(warning ...) out of the parse stage of Makefiles.
The same applies to CONFIG_ARM64_USE_LSE_ATOMICS.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Link: https://lore.kernel.org/r/20210801053525.105235-1-masahiroy@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
64ee84c75b