On Tue, Sep 22, 2015 at 07:49:13AM -0600, Shuah Khan wrote: > On 09/22/2015 04:45 AM, Andre Przywara wrote: > > At the moment the userfaultfd test program only supports x86 and an > > architecture called "powewrpc" ;-) > > Fix that typo and add the syscall numbers for other architectures as > > well. > > Also as in an ideal world a syscall number should come from the system > > header file <asm/unistd.h>, include that header and guard the explicit > > syscall number section below to avoid redefinitions. > > > > Signed-off-by: Andre Przywara <andre.przyw...@arm.com> > > --- > > tools/testing/selftests/vm/userfaultfd.c | 13 ++++++++++++- > > 1 file changed, 12 insertions(+), 1 deletion(-) > > > > diff --git a/tools/testing/selftests/vm/userfaultfd.c > > b/tools/testing/selftests/vm/userfaultfd.c > > index 2c7cca6..63be27f 100644 > > --- a/tools/testing/selftests/vm/userfaultfd.c > > +++ b/tools/testing/selftests/vm/userfaultfd.c > > @@ -65,16 +65,27 @@ > > #include <sys/ioctl.h> > > #include <pthread.h> > > #include "../../../../include/uapi/linux/userfaultfd.h" > > +#include <asm/unistd.h> > > > > +/* ideally the above user header provides that number, but ... */ > > +#ifndef __NR_userfaultfd > > #ifdef __x86_64__ > > #define __NR_userfaultfd 323 > > #elif defined(__i386__) > > #define __NR_userfaultfd 374 > > -#elif defined(__powewrpc__) > > +#elif defined(__powerpc__) > > #define __NR_userfaultfd 364 > > +#elif defined(__ia64__) > > +#define __NR_userfaultfd 1343 > > +#elif defined(__arm__) > > +#define __NR_userfaultfd 388 > > +#elif defined(__aarch64__) > > +/* this is from the generic syscall table, used also on other > > architectures */ > > +#define __NR_userfaultfd 283 > > #else > > #error "missing __NR_userfaultfd definition" > > #endif > > +#endif /* !__NR_userfaultfd */ > > > > static unsigned long nr_cpus, nr_pages, nr_pages_per_cpu, page_size; > > > > > > This is not okay. User-space shouldn't be (re)defining/duplicating > syscall numbers. I can't take this patch.
-mm has already been updated to do exactly that. Syscall numbers end up hardcoded into userland binaries/libs somewhere, so it's not a bugfix but certainly it's a nice cleanup to remove the whole #ifdef block. Andre, could you see if linux-next (which includes -mm) works for you by just running "cd tools/testing/selftests/vm/ && make"? If there's any further change required could you diff it against linux-next? Thanks! Andrea -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
