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authorHeiko Carstens <heiko.carstens@de.ibm.com>2015-08-13 13:44:34 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2015-08-19 10:39:54 +0200
commitcabc4abe8e368d754805691b146f31f574533cfa (patch)
treecfa9c771c327b1cb1ac5014b439a7ae30ed9d275
parent92d6289105d134582094eede00192bd66f54905f (diff)
downloadlinux-linaro-stable-cabc4abe8e368d754805691b146f31f574533cfa.tar.gz
s390/uaccess: remove uaccess_primary kernel parameter
get_user() and put_user() are inline functions in the meantime again. Both will generate the mvcos instruction if compiled with -march=z10 (or greater). The kernel parameter "uaccess_primary" can only change the behavior of out-of-line uaccess functions like copy_from_user() to not use the mvcos instruction, but not for the above named inlined functions. Therefore it is quite useless and the parameter can be removed. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--arch/s390/lib/uaccess.c15
1 files changed, 1 insertions, 14 deletions
diff --git a/arch/s390/lib/uaccess.c b/arch/s390/lib/uaccess.c
index 4614d415bb58..0d002a746bec 100644
--- a/arch/s390/lib/uaccess.c
+++ b/arch/s390/lib/uaccess.c
@@ -370,22 +370,9 @@ long __strncpy_from_user(char *dst, const char __user *src, long size)
}
EXPORT_SYMBOL(__strncpy_from_user);
-/*
- * The "old" uaccess variant without mvcos can be enforced with the
- * uaccess_primary kernel parameter. This is mainly for debugging purposes.
- */
-static int uaccess_primary __initdata;
-
-static int __init parse_uaccess_pt(char *__unused)
-{
- uaccess_primary = 1;
- return 0;
-}
-early_param("uaccess_primary", parse_uaccess_pt);
-
static int __init uaccess_init(void)
{
- if (!uaccess_primary && test_facility(27))
+ if (test_facility(27))
static_key_slow_inc(&have_mvcos);
return 0;
}