[S390] Enable guest page hinting by default.

Get rid of the PAGE_STATES config option and enable guest page hinting
by default.
It can be disabled by specifying "cmma=off" at the command line.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 47836b9..e030e86 100644 (file)
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -480,13 +480,6 @@ config CMM_IUCV
          Select this option to enable the special message interface to
          the cooperative memory management.
 
-config PAGE_STATES
-       bool "Unused page notification"
-       help
-         This enables the notification of unused pages to the
-         hypervisor. The ESSA instruction is used to do the states
-         changes between a page that has content and the unused state.
-
 config APPLDATA_BASE
        bool "Linux - VM Monitor Stream, base infrastructure"
        depends on PROC_FS

diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h
index 3e3594d..5e9daf5 100644 (file)
--- a/arch/s390/include/asm/page.h
+++ b/arch/s390/include/asm/page.h
@@ -125,8 +125,6 @@ page_get_storage_key(unsigned long addr)
        return skey;
 }
 
-#ifdef CONFIG_PAGE_STATES
-
 struct page;
 void arch_free_page(struct page *page, int order);
 void arch_alloc_page(struct page *page, int order);
@@ -134,8 +132,6 @@ void arch_alloc_page(struct page *page, int order);
 #define HAVE_ARCH_FREE_PAGE
 #define HAVE_ARCH_ALLOC_PAGE
 
-#endif
-
 #endif /* !__ASSEMBLY__ */
 
 #define __PAGE_OFFSET           0x0UL

diff --git a/arch/s390/include/asm/system.h b/arch/s390/include/asm/system.h
index 4fb83c1..379661d 100644 (file)
--- a/arch/s390/include/asm/system.h
+++ b/arch/s390/include/asm/system.h
@@ -109,11 +109,7 @@ extern void pfault_fini(void);
 #define pfault_fini()          do { } while (0)
 #endif /* CONFIG_PFAULT */
 
-#ifdef CONFIG_PAGE_STATES
 extern void cmma_init(void);
-#else
-static inline void cmma_init(void) { }
-#endif
 
 #define finish_arch_switch(prev) do {                                       \
        set_fs(current->thread.mm_segment);                                  \

diff --git a/arch/s390/mm/Makefile b/arch/s390/mm/Makefile
index db05661..eec0544 100644 (file)
--- a/arch/s390/mm/Makefile
+++ b/arch/s390/mm/Makefile
@@ -2,7 +2,7 @@
 # Makefile for the linux s390-specific parts of the memory manager.
 #
 
-obj-y   := init.o fault.o extmem.o mmap.o vmem.o pgtable.o maccess.o
+obj-y   := init.o fault.o extmem.o mmap.o vmem.o pgtable.o maccess.o \
+           page-states.o
 obj-$(CONFIG_CMM) += cmm.o
 obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
-obj-$(CONFIG_PAGE_STATES) += page-states.o

diff --git a/arch/s390/mm/page-states.c b/arch/s390/mm/page-states.c
index fc0ad73..f92ec20 100644 (file)
--- a/arch/s390/mm/page-states.c
+++ b/arch/s390/mm/page-states.c
@@ -1,6 +1,4 @@
 /*
- * arch/s390/mm/page-states.c
- *
  * Copyright IBM Corp. 2008
  *
  * Guest page hinting for unused pages.
@@ -17,11 +15,12 @@
 #define ESSA_SET_STABLE                1
 #define ESSA_SET_UNUSED                2
 
-static int cmma_flag;
+static int cmma_flag = 1;
 
 static int __init cmma(char *str)
 {
        char *parm;
+
        parm = strstrip(str);
        if (strcmp(parm, "yes") == 0 || strcmp(parm, "on") == 0) {
                cmma_flag = 1;
@@ -32,7 +31,6 @@ static int __init cmma(char *str)
                return 1;
        return 0;
 }
-
 __setup("cmma=", cmma);
 
 void __init cmma_init(void)