diff options
| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2016-12-12 16:43:09 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-12 18:55:07 -0800 |
| commit | c7142aead87aa5026e4b57671c7dbb1706b02606 (patch) | |
| tree | 174f043eb6436a684ef832f856f58221915b9241 /mm | |
| parent | c3352cbb1bdf198e81141700eb7003b8e2de1f1a (diff) | |
| download | linux-c7142aead87aa5026e4b57671c7dbb1706b02606.tar.gz | |
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')
| -rw-r--r-- | mm/mprotect.c | 4 |
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 */ |