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mm/pkeys: generate pkey system call code only if ARCH_HAS_PKEYS is selected

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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>
This commit is contained in:
Heiko Carstens
2016-12-12 16:43:09 -08:00
committed by Linus Torvalds
parent c3352cbb1b
commit c7142aead8
1 changed files with 4 additions and 0 deletions
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4
mm/mprotect.c
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@@ -497,6 +497,8 @@ SYSCALL_DEFINE3(mprotect, unsigned long, start, size_t, len,
return do_mprotect_pkey(start, len, prot, -1); return do_mprotect_pkey(start, len, prot, -1);
} }
#ifdef CONFIG_ARCH_HAS_PKEYS
SYSCALL_DEFINE4(pkey_mprotect, unsigned long, start, size_t, len, SYSCALL_DEFINE4(pkey_mprotect, unsigned long, start, size_t, len,
unsigned long, prot, int, pkey) unsigned long, prot, int, pkey)
{ {
@@ -547,3 +549,5 @@ SYSCALL_DEFINE1(pkey_free, int, pkey)
*/ */
return ret; return ret;
} }
#endif /* CONFIG_ARCH_HAS_PKEYS */