On 11/23/21 7:19 AM, Arnd Bergmann wrote: > On Tue, Nov 23, 2021 at 12:38 PM Naresh Kamboju > <naresh.kamboju@xxxxxxxxxx> 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(). I did a naieve "add them both to the .tbl" patch and the result booted to a shell prompt, but that doesn't mean much. What arch-specific entry code does clone3 need here? The SYSCALL_DEFINE2(clone3) in kernel/fork.c seems reasonably straightforward? (Unlike the #ifdef stack around the previous clone...) >> 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. I looked at trying to fix that but it seems to be a compiler bug. Gcc is warning about an ? : else case that's dead code eliminated. It's already GOT a test protecting it from being evaluated... >> 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. In which case the stack size is going to be 64k as well? > Arnd Rob
