1 files changed, 25 insertions, 33 deletions

diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 061479ff029f..91625f759ccd 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -25,7 +25,6 @@
 #include <linux/stddef.h>
 #include <linux/unistd.h>
 #include <linux/ptrace.h>
-#include <linux/slab.h>
 #include <linux/user.h>
 #include <linux/tty.h>
 #include <linux/ioport.h>
@@ -87,7 +86,6 @@ unsigned long elf_hwcap = 0;
 char elf_platform[ELF_PLATFORM_SIZE];
 
 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
-volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
 
 int __initdata memory_end_set;
 unsigned long __initdata memory_end;
@@ -124,12 +122,6 @@ void __cpuinit cpu_init(void)
          */
         get_cpu_id(&S390_lowcore.cpu_id);
 
-        /*
-         * Force FPU initialization:
-         */
-        clear_thread_flag(TIF_USEDFPU);
-        clear_used_math();
-
         atomic_inc(&init_mm.mm_count);
         current->active_mm = &init_mm;
         BUG_ON(current->mm);
@@ -305,9 +297,8 @@ static int __init early_parse_mem(char *p)
 }
 early_param("mem", early_parse_mem);
 
-#ifdef CONFIG_S390_SWITCH_AMODE
-unsigned int switch_amode = 0;
-EXPORT_SYMBOL_GPL(switch_amode);
+unsigned int user_mode = HOME_SPACE_MODE;
+EXPORT_SYMBOL_GPL(user_mode);
 
 static int set_amode_and_uaccess(unsigned long user_amode,
                                  unsigned long user32_amode)
@@ -340,23 +331,29 @@ static int set_amode_and_uaccess(unsigned long user_amode,
  */
 static int __init early_parse_switch_amode(char *p)
 {
-        switch_amode = 1;
+        if (user_mode != SECONDARY_SPACE_MODE)
+                user_mode = PRIMARY_SPACE_MODE;
         return 0;
 }
 early_param("switch_amode", early_parse_switch_amode);
 
-#else /* CONFIG_S390_SWITCH_AMODE */
-static inline int set_amode_and_uaccess(unsigned long user_amode,
-                                        unsigned long user32_amode)
+static int __init early_parse_user_mode(char *p)
 {
+        if (p && strcmp(p, "primary") == 0)
+                user_mode = PRIMARY_SPACE_MODE;
+#ifdef CONFIG_S390_EXEC_PROTECT
+        else if (p && strcmp(p, "secondary") == 0)
+                user_mode = SECONDARY_SPACE_MODE;
+#endif
+        else if (!p || strcmp(p, "home") == 0)
+                user_mode = HOME_SPACE_MODE;
+        else
+                return 1;
         return 0;
 }
-#endif /* CONFIG_S390_SWITCH_AMODE */
+early_param("user_mode", early_parse_user_mode);
 
 #ifdef CONFIG_S390_EXEC_PROTECT
-unsigned int s390_noexec = 0;
-EXPORT_SYMBOL_GPL(s390_noexec);
-
 /*
  * Enable execute protection?
  */
@@ -364,8 +361,7 @@ static int __init early_parse_noexec(char *p)
 {
         if (!strncmp(p, "off", 3))
                 return 0;
-        switch_amode = 1;
-        s390_noexec = 1;
+        user_mode = SECONDARY_SPACE_MODE;
         return 0;
 }
 early_param("noexec", early_parse_noexec);
@@ -373,7 +369,7 @@ early_param("noexec", early_parse_noexec);
 
 static void setup_addressing_mode(void)
 {
-        if (s390_noexec) {
+        if (user_mode == SECONDARY_SPACE_MODE) {
                 if (set_amode_and_uaccess(PSW_ASC_SECONDARY,
                                           PSW32_ASC_SECONDARY))
                         pr_info("Execute protection active, "
@@ -381,7 +377,7 @@ static void setup_addressing_mode(void)
                 else
                         pr_info("Execute protection active, "
                                 "mvcos not available\n");
-        } else if (switch_amode) {
+        } else if (user_mode == PRIMARY_SPACE_MODE) {
                 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY))
                         pr_info("Address spaces switched, "
                                 "mvcos available\n");
@@ -399,19 +395,16 @@ static void __init
 setup_lowcore(void)
 {
         struct _lowcore *lc;
-        int lc_pages;
 
         /*
          * Setup lowcore for boot cpu
          */
-        lc_pages = sizeof(void *) == 8 ? 2 : 1;
-        lc = (struct _lowcore *)
-                __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
-        memset(lc, 0, lc_pages * PAGE_SIZE);
+        BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
+        lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
         lc->restart_psw.addr =
                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
-        if (switch_amode)
+        if (user_mode != HOME_SPACE_MODE)
                 lc->restart_psw.mask |= PSW_ASC_HOME;
         lc->external_new_psw.mask = psw_kernel_bits;
         lc->external_new_psw.addr =
@@ -439,7 +432,7 @@ setup_lowcore(void)
 #ifndef CONFIG_64BIT
         if (MACHINE_HAS_IEEE) {
                 lc->extended_save_area_addr = (__u32)
-                        __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
+                        __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
                 /* enable extended save area */
                 __ctl_set_bit(14, 29);
         }
@@ -807,7 +800,7 @@ setup_arch(char **cmdline_p)
         if (MACHINE_IS_VM)
                 pr_info("Linux is running as a z/VM "
                         "guest operating system in 31-bit mode\n");
-        else
+        else if (MACHINE_IS_LPAR)
                 pr_info("Linux is running natively in 31-bit mode\n");
         if (MACHINE_HAS_IEEE)
                 pr_info("The hardware system has IEEE compatible "
@@ -821,7 +814,7 @@ setup_arch(char **cmdline_p)
                         "guest operating system in 64-bit mode\n");
         else if (MACHINE_IS_KVM)
                 pr_info("Linux is running under KVM in 64-bit mode\n");
-        else
+        else if (MACHINE_IS_LPAR)
                 pr_info("Linux is running natively in 64-bit mode\n");
 #endif /* CONFIG_64BIT */
 
@@ -851,7 +844,6 @@ setup_arch(char **cmdline_p)
         setup_lowcore();
 
         cpu_init();
-        __cpu_logical_map[0] = stap();
         s390_init_cpu_topology();
 
         /*