Re: [PATCH] tools uapi asm: Update asm-generic/unistd.h

[Laura Abbott]

On 1/9/19 5:15 AM, Arnaldo Carvalho de Melo wrote:
> Em Tue, Jan 08, 2019 at 02:17:58PM -0800, Laura Abbott escreveu:
> > Commit 4e21565b7fd4 ("asm-generic: add kexec_file_load system
> > call to unistd.h") added the system call to the generic header
> > but not to the perf copy resulting a compile failure on aarch64
>
> Humm, that shouldn't happen, i.e. kernel developers don't have to update
> anything in tools/ as part of their normal kernel development workflows.
>
> They can if they wish, but are not required, so the build failure was
> due to something else or a pre-existing bug where tools/ living stuff
> used things outside tools/.

I think that's the issue, I couldn't reproduce the issue until I
installed the 5.0-rc1 headers. This is the invocation of the script
(paths trimmed)

/tools/perf/arch/arm64/entry/syscalls//mksyscalltbl' 'gcc' 'gcc' /tools /tools/arch/arm64/include/uapi/asm/unistd.h > arch/arm64/include/generated/asm/syscalls.c


In tools/perf/arch/arm64/entry/syscalls/mksyscalltbl,

$hostcc -I $incpath/include/uapi -o $create_table_exe -x c -

This was the gcc command that was failing.
tools/arch/arm64/include/uapi/asm/unistd.h includes asm-generic/unistd.h
so I think that's what's leaking from the system.

> > When running mksyscalltbl
>
> Lemme try this on my Orangi PI zero...
>
> - Arnaldo
> >> BUILDSTDERR: <stdin>: In function 'main':
> > BUILDSTDERR: <stdin>:273:44: error: '__NR_kexec_file_load' undeclared (first use in this function)
> > BUILDSTDERR: <stdin>:273:44: note: each undeclared identifier is reported only once for each function it appears in
> >
> > Fix this by syncing up.
> >
> > Fixes: 4e21565b7fd4 ("asm-generic: add kexec_file_load system call to unistd.h")
> > Signed-off-by: Laura Abbott <labbott@xxxxxxxxxx>
> > ---
> > Found this on Fedora when compiling 5.0-rc1, I hadn't seen a patch
> > queued yet.
> > ---
> >   tools/include/uapi/asm-generic/unistd.h | 4 +++-
> >   1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/tools/include/uapi/asm-generic/unistd.h b/tools/include/uapi/asm-generic/unistd.h
> > index c7f3321fbe43..d90127298f12 100644
> > --- a/tools/include/uapi/asm-generic/unistd.h
> > +++ b/tools/include/uapi/asm-generic/unistd.h
> > @@ -738,9 +738,11 @@ __SYSCALL(__NR_statx,     sys_statx)
> >   __SC_COMP(__NR_io_pgetevents, sys_io_pgetevents, compat_sys_io_pgetevents)
> >   #define __NR_rseq 293
> >   __SYSCALL(__NR_rseq, sys_rseq)
> > +#define __NR_kexec_file_load 294
> > +__SYSCALL(__NR_kexec_file_load,     sys_kexec_file_load)
> >   
> >   #undef __NR_syscalls
> > -#define __NR_syscalls 294
> > +#define __NR_syscalls 295
> >   
> >   /*
> >    * 32 bit systems traditionally used different
> > --
> > 2.20.1