On 11/23/21 7:19 AM, Arnd Bergmann wrote:
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().
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