mm,x86,um: move CMPXCHG_DOUBLE config option

Move CMPXCHG_DOUBLE and rename it to HAVE_CMPXCHG_DOUBLE so architectures
can simply select the option if it is supported.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/arch/Kconfig b/arch/Kconfig
index 1ee451fac6298322e8e24bee205914ef0b416c39..ebb86e56bb552a83ec627ddfe466180ffd9ef6f1 100644 (file)
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -199,4 +199,7 @@ config HAVE_ALIGNED_STRUCT_PAGE
 config HAVE_CMPXCHG_LOCAL
        bool
 
+config HAVE_CMPXCHG_DOUBLE
+       bool
+
 source "kernel/gcov/Kconfig"

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index e5b662473015ae6b156ade2d8b71be08fae93c2f..19755c217e00e8e194480b45065932bfcc7b0a87 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -60,6 +60,7 @@ config X86
        select ANON_INODES
        select HAVE_ALIGNED_STRUCT_PAGE if SLUB && !M386
        select HAVE_CMPXCHG_LOCAL if !M386
+       select HAVE_CMPXCHG_DOUBLE
        select HAVE_ARCH_KMEMCHECK
        select HAVE_USER_RETURN_NOTIFIER
        select HAVE_ARCH_JUMP_LABEL

diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index 99d2ab8b77953bde375e44328604aee7473fdd59..3c57033e22118f2ce7771d10fa8305193c94af20 100644 (file)
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -309,9 +309,6 @@ config X86_INTERNODE_CACHE_SHIFT
 config X86_CMPXCHG
        def_bool X86_64 || (X86_32 && !M386)
 
-config CMPXCHG_DOUBLE
-       def_bool y
-
 config X86_L1_CACHE_SHIFT
        int
        default "7" if MPENTIUM4 || MPSC

diff --git a/arch/x86/um/Kconfig b/arch/x86/um/Kconfig
index a62bfc66239ec5bd7aac0d7b423e817c7ace85ce..b2b54d2edf53979fb7daf770c0d4bf0215a73fe0 100644 (file)
--- a/arch/x86/um/Kconfig
+++ b/arch/x86/um/Kconfig
@@ -6,10 +6,6 @@ menu "UML-specific options"
 
 menu "Host processor type and features"
 
-config CMPXCHG_DOUBLE
-       bool
-       default n
-
 source "arch/x86/Kconfig.cpu"
 
 endmenu

diff --git a/mm/slub.c b/mm/slub.c
index b5c6db2dfe7f6c4af7090cc34bdfa6f1610c5505..4a17c2b7908965e7e79d8d7b1a5279b8adead8a0 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -366,7 +366,8 @@ static inline bool __cmpxchg_double_slab(struct kmem_cache *s, struct page *page
                const char *n)
 {
        VM_BUG_ON(!irqs_disabled());
-#if defined(CONFIG_CMPXCHG_DOUBLE) && defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE)
+#if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \
+    defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE)
        if (s->flags & __CMPXCHG_DOUBLE) {
                if (cmpxchg_double(&page->freelist,
                        freelist_old, counters_old,
@@ -400,7 +401,8 @@ static inline bool cmpxchg_double_slab(struct kmem_cache *s, struct page *page,
                void *freelist_new, unsigned long counters_new,
                const char *n)
 {
-#if defined(CONFIG_CMPXCHG_DOUBLE) && defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE)
+#if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \
+    defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE)
        if (s->flags & __CMPXCHG_DOUBLE) {
                if (cmpxchg_double(&page->freelist,
                        freelist_old, counters_old,
@@ -3002,7 +3004,8 @@ static int kmem_cache_open(struct kmem_cache *s,
                }
        }
 
-#if defined(CONFIG_CMPXCHG_DOUBLE) && defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE)
+#if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \
+    defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE)
        if (system_has_cmpxchg_double() && (s->flags & SLAB_DEBUG_FLAGS) == 0)
                /* Enable fast mode */
                s->flags |= __CMPXCHG_DOUBLE;