[PATCH] Fix tst-pkey.c pkey_alloc return checks and manual

["Lucas A. M. Magalhaes" <lamm@linux.ibm.com>]

This test was failing in some powerpc systems as it was not checking
for ENOSPC return.

As said on the Linux man-pages and can be observed by the implementation
at mm/mprotect.c in the Linux Kernel source.  The syscall pkey_alloc can
return EINVAL or ENOSPC.  ENOSPC will indicate either that all keys are
in use or that the kernel does not support pkeys.
---
 manual/memory.texi                 | 4 ++++
 sysdeps/unix/sysv/linux/tst-pkey.c | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/manual/memory.texi b/manual/memory.texi
index b565dd69f2..aa5011e4f9 100644
--- a/manual/memory.texi
+++ b/manual/memory.texi
@@ -3288,6 +3288,10 @@ in which memory protection keys are disabled.
 
 @item ENOSPC
 All available protection keys already have been allocated.
+
+The system does not implement memory protection keys or runs in a mode
+in which memory protection keys are disabled.
+
 @end table
 @end deftypefun
 
diff --git a/sysdeps/unix/sysv/linux/tst-pkey.c b/sysdeps/unix/sysv/linux/tst-pkey.c
index 4c4fbae3ad..4ea1bc4f9a 100644
--- a/sysdeps/unix/sysv/linux/tst-pkey.c
+++ b/sysdeps/unix/sysv/linux/tst-pkey.c
@@ -197,6 +197,10 @@ do_test (void)
       if (errno == EINVAL)
         FAIL_UNSUPPORTED
           ("CPU does not support memory protection keys: %m");
+      if (errno == ENOSPC)
+        FAIL_UNSUPPORTED
+          ("no keys available or kernel does not support memory"
+           " protection keys");
       FAIL_EXIT1 ("pkey_alloc: %m");
     }
   TEST_COMPARE (pkey_get (keys[0]), 0);
-- 
2.20.1