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    SubjectRe: spinlock.c:306:9: error: implicit declaration of function '__raw_write_lock_nested'
    On Tue, Nov 23, 2021 at 12:38 PM Naresh Kamboju
    <naresh.kamboju@linaro.org> wrote:
    >
    > While building Linux next 20211123 tag for sh with gcc-11
    > following warnings / errors noticed.

    Nothing in here looks like a recent regression from either the kernel
    or gcc-11.

    > make --silent --keep-going --jobs=8
    > O=/home/tuxbuild/.cache/tuxmake/builds/current ARCH=sh
    > CROSS_COMPILE=sh4-linux-gnu- 'CC=sccache sh4-linux-gnu-gcc'
    > 'HOSTCC=sccache gcc'
    > Generating include/generated/machtypes.h
    > <stdin>:1517:2: warning: #warning syscall clone3 not implemented [-Wcpp]
    > <stdin>:1559:2: warning: #warning syscall futex_waitv not implemented [-Wcpp]

    These happen with any compiler version, someone needs to write the correct
    entry code for clone3 and hook up futex_waitv().

    > include/linux/sh_intc.h:100:63: warning: division 'sizeof (void *) / sizeof (void)' does not compute the number of array elements

    These are old bugs, they show up in any kernel version with gcc-8 or higher.

    > fs/mpage.c:336:1: warning: the frame size of 1092 bytes is larger than

    I see these going back to gcc-6, it looks like this is caused by
    CONFIG_PAGE_SIZE_64KB.

    Arnd

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