uml: remove page_size()

userspace code used to have to call the kernelspace function page_size() in
order to determine the value of the kernel's PAGE_SIZE.  Since this is now
available directly from kern_constants.h as UM_KERN_PAGE_SIZE, page_size() can
be deleted and calls changed to use the constant.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

10 files changed, 25 insertions, 24 deletions

diff --git a/arch/um/drivers/net_user.c b/arch/um/drivers/net_user.c
index b63a86046374..3503cff867c3 100644
--- a/arch/um/drivers/net_user.c
+++ b/arch/um/drivers/net_user.c
@@ -18,6 +18,7 @@
 #include "net_user.h"
 #include "os.h"
 #include "um_malloc.h"
+#include "kern_constants.h"
 
 int tap_open_common(void *dev, char *gate_addr)
 {
@@ -215,7 +216,7 @@ static void change(char *dev, char *what, unsigned char *addr,
         sprintf(netmask_buf, "%d.%d.%d.%d", netmask[0], netmask[1], 
                 netmask[2], netmask[3]);
 
-        output_len = page_size();
+        output_len = UM_KERN_PAGE_SIZE;
         output = um_kmalloc(output_len);
         if(output == NULL)
                 printk("change : failed to allocate output buffer\n");
diff --git a/arch/um/drivers/slip_user.c b/arch/um/drivers/slip_user.c
index 9f41cece0916..78f0e515da8f 100644
--- a/arch/um/drivers/slip_user.c
+++ b/arch/um/drivers/slip_user.c
@@ -15,6 +15,7 @@
 #include "slip_common.h"
 #include "os.h"
 #include "um_malloc.h"
+#include "kern_constants.h"
 
 static int slip_user_init(void *data, void *dev)
 {
@@ -89,7 +90,7 @@ static int slip_tramp(char **argv, int fd)
                 goto out_close;
         pid = err;
 
-        output_len = page_size();
+        output_len = UM_KERN_PAGE_SIZE;
         output = um_kmalloc(output_len);
         if(output == NULL){
                 printk("slip_tramp : failed to allocate output buffer\n");
diff --git a/arch/um/include/kern_util.h b/arch/um/include/kern_util.h
index 09810bc48e5b..ae434a9b400d 100644
--- a/arch/um/include/kern_util.h
+++ b/arch/um/include/kern_util.h
@@ -52,7 +52,6 @@ extern void set_tracing(void *t, int tracing);
 extern int is_tracing(void *task);
 extern int segv_syscall(void);
 extern void kern_finish_exec(void *task, int new_pid, unsigned long stack);
-extern int page_size(void);
 extern unsigned long page_mask(void);
 extern int need_finish_fork(void);
 extern void free_stack(unsigned long stack, int order);
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index d6d3319b3670..9ac9944aa2c7 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -217,11 +217,6 @@ void cpu_idle(void)
         CHOOSE_MODE(init_idle_tt(), init_idle_skas());
 }
 
-int page_size(void)
-{
-        return PAGE_SIZE;
-}
-
 void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
                       pte_t *pte_out)
 {
diff --git a/arch/um/os-Linux/drivers/ethertap_user.c b/arch/um/os-Linux/drivers/ethertap_user.c
index 4e38ccf35129..96e12ea8172c 100644
--- a/arch/um/os-Linux/drivers/ethertap_user.c
+++ b/arch/um/os-Linux/drivers/ethertap_user.c
@@ -20,6 +20,7 @@
 #include "etap.h"
 #include "os.h"
 #include "um_malloc.h"
+#include "kern_constants.h"
 
 #define MAX_PACKET ETH_MAX_PACKET
 
@@ -50,10 +51,10 @@ static void etap_change(int op, unsigned char *addr, unsigned char *netmask,
         n = os_write_file(fd, &change, sizeof(change));
         if(n != sizeof(change))
                 printk("etap_change - request failed, err = %d\n", -n);
-        output = um_kmalloc(page_size());
+        output = um_kmalloc(UM_KERN_PAGE_SIZE);
         if(output == NULL)
                 printk("etap_change : Failed to allocate output buffer\n");
-        read_output(fd, output, page_size());
+        read_output(fd, output, UM_KERN_PAGE_SIZE);
         if(output != NULL){
                 printk("%s", output);
                 kfree(output);
@@ -159,7 +160,7 @@ static int etap_open(void *data)
 
         err = etap_tramp(pri->dev_name, pri->gate_addr, control_fds[0], 
                          control_fds[1], data_fds[0], data_fds[1]);
-        output_len = page_size();
+        output_len = UM_KERN_PAGE_SIZE;
         output = um_kmalloc(output_len);
         read_output(control_fds[0], output, output_len);
 
diff --git a/arch/um/os-Linux/helper.c b/arch/um/os-Linux/helper.c
index f35220c72042..2184ddb9cb31 100644
--- a/arch/um/os-Linux/helper.c
+++ b/arch/um/os-Linux/helper.c
@@ -15,6 +15,7 @@
 #include "kern_util.h"
 #include "os.h"
 #include "um_malloc.h"
+#include "kern_constants.h"
 
 struct helper_data {
         void (*pre_exec)(void*);
@@ -69,7 +70,7 @@ int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv,
                 goto out_close;
         }
 
-        sp = stack + page_size() - sizeof(void *);
+        sp = stack + UM_KERN_PAGE_SIZE - sizeof(void *);
         data.pre_exec = pre_exec;
         data.pre_data = pre_data;
         data.argv = argv;
@@ -123,7 +124,7 @@ int run_helper_thread(int (*proc)(void *), void *arg, unsigned int flags,
         if (stack == 0)
                 return -ENOMEM;
 
-        sp = stack + (page_size() << stack_order) - sizeof(void *);
+        sp = stack + (UM_KERN_PAGE_SIZE << stack_order) - sizeof(void *);
         pid = clone(proc, (void *) sp, flags | SIGCHLD, arg);
         if (pid < 0) {
                 err = -errno;
diff --git a/arch/um/os-Linux/process.c b/arch/um/os-Linux/process.c
index 2babea30345e..37933d3f92b8 100644
--- a/arch/um/os-Linux/process.c
+++ b/arch/um/os-Linux/process.c
@@ -244,7 +244,7 @@ void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int))
 
         if(sig_stack != NULL){
                 pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER);
-                set_sigstack(sig_stack, pages * page_size());
+                set_sigstack(sig_stack, pages * UM_KERN_PAGE_SIZE);
                 flags = SA_ONSTACK;
         }
         if(usr1_handler){
diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index 6554ff530128..29fd079c30b1 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -33,6 +33,7 @@
 #include "uml-config.h"
 #include "process.h"
 #include "longjmp.h"
+#include "kern_constants.h"
 
 int is_skas_winch(int pid, int fd, void *data)
 {
@@ -171,7 +172,7 @@ static int userspace_tramp(void *stack)
                 int fd;
                 __u64 offset;
                 fd = phys_mapping(to_phys(&__syscall_stub_start), &offset);
-                addr = mmap64((void *) UML_CONFIG_STUB_CODE, page_size(),
+                addr = mmap64((void *) UML_CONFIG_STUB_CODE, UM_KERN_PAGE_SIZE,
                               PROT_EXEC, MAP_FIXED | MAP_PRIVATE, fd, offset);
                 if(addr == MAP_FAILED){
                         printk("mapping mmap stub failed, errno = %d\n",
@@ -181,8 +182,8 @@ static int userspace_tramp(void *stack)
 
                 if(stack != NULL){
                         fd = phys_mapping(to_phys(stack), &offset);
-                        addr = mmap((void *) UML_CONFIG_STUB_DATA, page_size(),
-                                    PROT_READ | PROT_WRITE,
+                        addr = mmap((void *) UML_CONFIG_STUB_DATA,
+                                    UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
                                     MAP_FIXED | MAP_SHARED, fd, offset);
                         if(addr == MAP_FAILED){
                                 printk("mapping segfault stack failed, "
@@ -198,7 +199,7 @@ static int userspace_tramp(void *stack)
                                   (unsigned long) stub_segv_handler -
                                   (unsigned long) &__syscall_stub_start;
 
-                set_sigstack((void *) UML_CONFIG_STUB_DATA, page_size());
+                set_sigstack((void *) UML_CONFIG_STUB_DATA, UM_KERN_PAGE_SIZE);
                 sigemptyset(&sa.sa_mask);
                 sigaddset(&sa.sa_mask, SIGIO);
                 sigaddset(&sa.sa_mask, SIGWINCH);
diff --git a/arch/um/os-Linux/tt.c b/arch/um/os-Linux/tt.c
index 00e14f446f16..bcf9359c4e9f 100644
--- a/arch/um/os-Linux/tt.c
+++ b/arch/um/os-Linux/tt.c
@@ -31,6 +31,7 @@
 #include "choose-mode.h"
 #include "mode.h"
 #include "tempfile.h"
+#include "kern_constants.h"
 
 int protect_memory(unsigned long addr, unsigned long len, int r, int w, int x,
                    int must_succeed)
@@ -142,7 +143,7 @@ int outer_tramp(void *arg)
         int sig = sigkill;
 
         t = arg;
-        t->pid = clone(t->tramp, (void *) t->temp_stack + page_size()/2,
+        t->pid = clone(t->tramp, (void *) t->temp_stack + UM_KERN_PAGE_SIZE/2,
                        t->flags, t->tramp_data);
         if(t->pid > 0) wait_for_stop(t->pid, SIGSTOP, PTRACE_CONT, NULL);
         kill(os_getpid(), sig);
diff --git a/arch/um/os-Linux/util.c b/arch/um/os-Linux/util.c
index 0e771bb04dd2..48bc4927b996 100644
--- a/arch/um/os-Linux/util.c
+++ b/arch/um/os-Linux/util.c
@@ -29,28 +29,29 @@
 #include "uml-config.h"
 #include "os.h"
 #include "longjmp.h"
+#include "kern_constants.h"
 
 void stack_protections(unsigned long address)
 {
         int prot = PROT_READ | PROT_WRITE | PROT_EXEC;
 
-        if(mprotect((void *) address, page_size(), prot) < 0)
+        if(mprotect((void *) address, UM_KERN_PAGE_SIZE, prot) < 0)
                 panic("protecting stack failed, errno = %d", errno);
 }
 
 void task_protections(unsigned long address)
 {
-        unsigned long guard = address + page_size();
-        unsigned long stack = guard + page_size();
+        unsigned long guard = address + UM_KERN_PAGE_SIZE;
+        unsigned long stack = guard + UM_KERN_PAGE_SIZE;
         int prot = 0, pages;
 
 #ifdef notdef
-        if(mprotect((void *) stack, page_size(), prot) < 0)
+        if(mprotect((void *) stack, UM_KERN_PAGE_SIZE, prot) < 0)
                 panic("protecting guard page failed, errno = %d", errno);
 #endif
         pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER) - 2;
         prot = PROT_READ | PROT_WRITE | PROT_EXEC;
-        if(mprotect((void *) stack, pages * page_size(), prot) < 0)
+        if(mprotect((void *) stack, pages * UM_KERN_PAGE_SIZE, prot) < 0)
                 panic("protecting stack failed, errno = %d", errno);
 }