selftests/powerpc: Fix pkey syscall redefinitions

On distros using older glibc versions, the pkey tests encounter build
failures due to redefinition of the pkey syscall numbers.

For compatibility, commit 743f3544fffb added a wrapper for the
gettid() syscall and included syscall.h if the version of glibc used
is older than 2.30. This leads to different definitions of SYS_pkey_*
as the ones in the pkey test header set numeric constants where as the
ones from syscall.h reuse __NR_pkey_*. The compiler complains about
redefinitions since they are different.

This replaces SYS_pkey_* definitions with __NR_pkey_* such that the
definitions in both syscall.h and pkeys.h are alike. This way, if
syscall.h has to be included for compatibility reasons, builds will
still succeed.

Fixes: 743f3544fffb ("selftests/powerpc: Add wrapper for gettid")
Reported-by: Sachin Sant <[e-mail]>
Suggested-by: David Laight <[e-mail]>
Suggested-by: Michael Ellerman <[e-mail]>
Signed-off-by: Sandipan Das <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

tools/testing/selftests/powerpc/include/pkeys.h

···
 
 #define SI_PKEY_OFFSET	0x20
 
-#define SYS_pkey_mprotect	386
-#define SYS_pkey_alloc		384
-#define SYS_pkey_free		385
+#define __NR_pkey_mprotect	386
+#define __NR_pkey_alloc		384
+#define __NR_pkey_free		385
 
 #define PKEY_BITS_PER_PKEY	2
 #define NR_PKEYS		32
···
 
 int sys_pkey_mprotect(void *addr, size_t len, int prot, int pkey)
 {
-	return syscall(SYS_pkey_mprotect, addr, len, prot, pkey);
+	return syscall(__NR_pkey_mprotect, addr, len, prot, pkey);
 }
 
 int sys_pkey_alloc(unsigned long flags, unsigned long rights)
 {
-	return syscall(SYS_pkey_alloc, flags, rights);
+	return syscall(__NR_pkey_alloc, flags, rights);
 }
 
 int sys_pkey_free(int pkey)
 {
-	return syscall(SYS_pkey_free, pkey);
+	return syscall(__NR_pkey_free, pkey);
 }
 
 int pkeys_unsupported(void)