The patch titled
Subject: mm/pkeys: generate pkey system call code only if ARCH_HAS_PKEYS is selected
has been added to the -mm tree. Its filename is
mm-pkeys-generate-pkey-system-call-code-only-if-arch_has_pkeys-is-selected.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-pkeys-generate-pkey-system-call-code-only-if-arch_has_pkeys-is-selected.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-pkeys-generate-pkey-system-call-code-only-if-arch_has_pkeys-is-selected.patch
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From: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Subject: 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@xxxxxxxxxx
Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Acked-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mprotect.c | 4 ++++
1 file changed, 4 insertions(+)
diff -puN mm/mprotect.c~mm-pkeys-generate-pkey-system-call-code-only-if-arch_has_pkeys-is-selected mm/mprotect.c
--- a/mm/mprotect.c~mm-pkeys-generate-pkey-system-call-code-only-if-arch_has_pkeys-is-selected
+++ a/mm/mprotect.c
@@ -497,6 +497,8 @@ SYSCALL_DEFINE3(mprotect, unsigned long,
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 */
_
Patches currently in -mm which might be from heiko.carstens@xxxxxxxxxx are
mm-pkeys-generate-pkey-system-call-code-only-if-arch_has_pkeys-is-selected.patch
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