mm,x86,um: move CMPXCHG_LOCAL config option

Move CMPXCHG_LOCAL and rename it to HAVE_CMPXCHG_LOCAL 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 0fb17e0c4cd0896c2c9758c301872849c27f792b..1ee451fac6298322e8e24bee205914ef0b416c39 100644 (file)
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -196,4 +196,7 @@ config HAVE_ALIGNED_STRUCT_PAGE
          on a struct page for better performance. However selecting this
          might increase the size of a struct page by a word.
 
+config HAVE_CMPXCHG_LOCAL
+       bool
+
 source "kernel/gcov/Kconfig"

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index f7e25ba254122daaf86459ab25eb045c7769a20a..d7fb39eb8e298b4f3f6290471e9ea8624ae9d076 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -76,6 +76,7 @@ config X86
        select CLKEVT_I8253
        select ARCH_HAVE_NMI_SAFE_CMPXCHG
        select HAVE_ALIGNED_STRUCT_PAGE if SLUB && !M386
+       select HAVE_CMPXCHG_LOCAL if !M386
 
 config INSTRUCTION_DECODER
        def_bool (KPROBES || PERF_EVENTS || UPROBES)

diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index e3ca7e0d858c9203fe787244b6022193c7bc7769..99d2ab8b77953bde375e44328604aee7473fdd59 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_LOCAL
-       def_bool X86_64 || (X86_32 && !M386)
-
 config CMPXCHG_DOUBLE
        def_bool y
 

diff --git a/arch/x86/um/Kconfig b/arch/x86/um/Kconfig
index 1d97bd84b6fbcfe684b559cf271f7fe72d75f92b..a62bfc66239ec5bd7aac0d7b423e817c7ace85ce 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_LOCAL
-       bool
-       default n
-
 config CMPXCHG_DOUBLE
        bool
        default n

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 8fd603b1665e5be65bc10c93f146b860f706925d..f600557a76596231ef659fdff0c9f2ea8aed71ae 100644 (file)
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -295,7 +295,7 @@ void __dec_zone_page_state(struct page *page, enum zone_stat_item item)
 }
 EXPORT_SYMBOL(__dec_zone_page_state);
 
-#ifdef CONFIG_CMPXCHG_LOCAL
+#ifdef CONFIG_HAVE_CMPXCHG_LOCAL
 /*
  * If we have cmpxchg_local support then we do not need to incur the overhead
  * that comes with local_irq_save/restore if we use this_cpu_cmpxchg.