Hi Arnd, On Tue, 2015-01-13 at 17:19 +0100, Arnd Bergmann wrote: > We've been getting this warning for ages: > > ./usr/include/linux/kexec.h:61: userspace cannot reference function or variable defined in the kernel > > There is no proper fix for this file, as the declaration is meant for > user space, not for the kernel, so we should work around it the > same way that we treat the seqbuf_dump() definition. For the seqbuf_dump() stuff there are apparently users. I forgot the details, but the sound people wanted to keep that declaration (and some related ancient things) in the header involved to keep some really ancient stuff buildable. But the kexec_load declaration isn't very useful for userspace, see the patch I submitted in http://lkml.kernel.org/r/1389791824.17407.9.camel@x220 . And After my attempt the export of that declaration has also been discussed in http://lkml.kernel.org/r/115373b6ac68ee7a305975896e1c4971e8e51d4c.1408731991.git.geoff@xxxxxxxxxxxxx In that last discussion no one has been able to point to an actual user of it. So, as far as I can tell, no one actually uses it. Which makes sense, because including this header by itself doesn't give one access to a useful definition of kexec_load. So why bother with the declaration? The last time that Geoff has been trying to get that patch applied should be http://lkml.kernel.org/r/b0702fc4186db21820d686e89afd6480560823db.1415837218.git.geoff@xxxxxxxxxxxxx I'd rather see that go in. > Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> > > diff --git a/scripts/headers_check.pl b/scripts/headers_check.pl > index 62320f93e903..fb051848667c 100755 > --- a/scripts/headers_check.pl > +++ b/scripts/headers_check.pl > @@ -69,6 +69,10 @@ sub check_declarations > if ($line =~ m/^void seqbuf_dump\(void\);/) { > return; > } > + # user-only declaration from kexec.h > + if ($line =~ m/^extern int kexec_load/) { > + return; > + } > if ($line =~ m/^(\s*extern|unsigned|char|short|int|long|void)\b/) { > printf STDERR "$filename:$lineno: " . > "userspace cannot reference function or " . Regards, Paul Bolle -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
