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authorHeiko Carstens <heiko.carstens@de.ibm.com>2016-12-13 03:43:09 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-13 05:55:07 +0300
commitc7142aead87aa5026e4b57671c7dbb1706b02606 (patch)
tree174f043eb6436a684ef832f856f58221915b9241 /mm/mprotect.c
parentc3352cbb1bdf198e81141700eb7003b8e2de1f1a (diff)
downloadlinux-c7142aead87aa5026e4b57671c7dbb1706b02606.tar.xz
mm/pkeys: generate pkey system call code only if ARCH_HAS_PKEYS is selected
Having code for the pkey_mprotect, pkey_alloc and pkey_free system calls makes only sense if ARCH_HAS_PKEYS is selected. If not selected these system calls will always return -ENOSPC or -EINVAL. To simplify things and have less code generate the pkey system call code only if ARCH_HAS_PKEYS is selected. For architectures which have already wired up the system calls, but do not select ARCH_HAS_PKEYS this will result in less generated code and a different return code: the three system calls will now always return -ENOSYS, using the cond_syscall mechanism. For architectures which have not wired up the system calls less unreachable code will be generated. Link: http://lkml.kernel.org/r/20161114111251.70084-1-heiko.carstens@de.ibm.com Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Acked-by: Dave Hansen <dave.hansen@linux.intel.com> Cc: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mprotect.c')
-rw-r--r--mm/mprotect.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/mprotect.c b/mm/mprotect.c
index c5ba2aae0f54..cc2459c57f60 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -497,6 +497,8 @@ SYSCALL_DEFINE3(mprotect, unsigned long, start, size_t, len,
return do_mprotect_pkey(start, len, prot, -1);
}
+#ifdef CONFIG_ARCH_HAS_PKEYS
+
SYSCALL_DEFINE4(pkey_mprotect, unsigned long, start, size_t, len,
unsigned long, prot, int, pkey)
{
@@ -547,3 +549,5 @@ SYSCALL_DEFINE1(pkey_free, int, pkey)
*/
return ret;
}
+
+#endif /* CONFIG_ARCH_HAS_PKEYS */