Re: [PATCH 17/21] powerpc: Add missing prototype for sys_debug_setcontext
From: Michael Ellerman
Date: Sun Mar 04 2018 - 05:54:37 EST
Mathieu Malaterre <malat@xxxxxxxxxx> writes:
> In commit 81e7009ea46c ("powerpc: merge ppc signal.c and ppc64 signal32.c")
> the function sys_debug_setcontext was added without a prototype.
>
> Fix compilation warning (treated as error in W=1):
>
> CC arch/powerpc/kernel/signal_32.o
> arch/powerpc/kernel/signal_32.c:1227:5: error: no previous prototype for âsys_debug_setcontextâ [-Werror=missing-prototypes]
> int sys_debug_setcontext(struct ucontext __user *ctx,
> ^~~~~~~~~~~~~~~~~~~~
> cc1: all warnings being treated as errors
This one should actually be using the SYSCALL_DEFINE syntax, so that it
can be used with CONFIG_FTRACE_SYSCALLS.
See eg. our mmap:
SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len,
unsigned long, prot, unsigned long, flags,
unsigned long, fd, off_t, offset)
{
return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
}
We probably still need this patch, but I'm not entirely sure because the
SYSCALL_DEFINE macro does all sorts of shenanigans.
cheers