Re: mm/munlock: mlock_page() munlock_page() batch by pagevec

[Naresh Kamboju]

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@xxxxxxxxxx>

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