The following build regression noticed while building Linux next 20220209 arm/riscv/sh of allnoconfig and tinyconfig builds failed with gcc-10, gcc-11 and clang-13.
clang: warning: argument unused during compilation: '-march=armv7-m' [-Wunused-command-line-argument] mm/swap.c:637:2: error: implicit declaration of function 'mlock_page_drain' [-Werror,-Wimplicit-function-declaration] mlock_page_drain(cpu); ^ 1 error generated. make[2]: *** [scripts/Makefile.build:289: mm/swap.o] Error 1
Reported-by: Linux Kernel Functional Testing lkft@linaro.org
-- Linaro LKFT https://lkft.linaro.org
On Wed, 9 Feb 2022, Naresh Kamboju wrote:
The following build regression noticed while building Linux next 20220209 arm/riscv/sh of allnoconfig and tinyconfig builds failed with gcc-10, gcc-11 and clang-13.
clang: warning: argument unused during compilation: '-march=armv7-m' [-Wunused-command-line-argument] mm/swap.c:637:2: error: implicit declaration of function 'mlock_page_drain' [-Werror,-Wimplicit-function-declaration] mlock_page_drain(cpu); ^ 1 error generated. make[2]: *** [scripts/Makefile.build:289: mm/swap.o] Error 1
Reported-by: Linux Kernel Functional Testing lkft@linaro.org
Thanks Naresh, Geert had already reported, and SeongJae sent a fix in
https://lore.kernel.org/lkml/20220209094158.21941-2-sj@kernel.org/
Turns out that a !CONFIG_MMU CONFIG_SMP config will need one more stub, I just sent a v2 update to SJ's patch in that thread.
Hugh
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Hugh Dickins -
Naresh Kamboju