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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/Kconfig b/arch/Kconfig
index 22182a8..4f55c73 100644 (file)
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -196,4 +196,7 @@ 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 59717fd..6c14ecd 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -62,6 +62,7 @@ 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 ARCH_BINFMT_ELF_RANDOMIZE_PIE

diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index 99d2ab8..3c57033 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 a62bfc6..b2b54d2 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 72aa841..4907563 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, &page->counters,
                        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, &page->counters,
                        freelist_old, counters_old,
@@ -3014,7 +3016,8 @@ 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;