um: kill HOST_TASK_PID

just provide get_current_pid() to the userland side of things
instead of get_current() + manual poking in its results

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>

4 files changed, 4 insertions, 8 deletions

diff --git a/arch/um/include/shared/common-offsets.h b/arch/um/include/shared/common-offsets.h
index d7fe563aa7e..40db8f71dea 100644
--- a/arch/um/include/shared/common-offsets.h
+++ b/arch/um/include/shared/common-offsets.h
@@ -2,8 +2,6 @@
 
 DEFINE(KERNEL_MADV_REMOVE, MADV_REMOVE);
 
-OFFSET(HOST_TASK_PID, task_struct, pid);
-
 DEFINE(UM_KERN_PAGE_SIZE, PAGE_SIZE);
 DEFINE(UM_KERN_PAGE_MASK, PAGE_MASK);
 DEFINE(UM_KERN_PAGE_SHIFT, PAGE_SHIFT);
diff --git a/arch/um/include/shared/kern_util.h b/arch/um/include/shared/kern_util.h
index 0f148385246..00965d06d2c 100644
--- a/arch/um/include/shared/kern_util.h
+++ b/arch/um/include/shared/kern_util.h
@@ -48,7 +48,7 @@ extern void do_uml_exitcalls(void);
  * GFP_ATOMIC.
  */
 extern int __cant_sleep(void);
-extern void *get_current(void);
+extern int get_current_pid(void);
 extern int copy_from_user_proc(void *to, void *from, int size);
 extern int cpu(void);
 extern char *uml_strdup(const char *string);
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index 69f24905abd..f386d04a84a 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -126,9 +126,9 @@ void exit_thread(void)
 {
 }
 
-void *get_current(void)
+int get_current_pid(void)
 {
-        return current;
+        return task_pid_nr(current);
 }
 
 /*
diff --git a/arch/x86/um/bugs_32.c b/arch/x86/um/bugs_32.c
index a1fba5fb9db..17d88cf2c6c 100644
--- a/arch/x86/um/bugs_32.c
+++ b/arch/x86/um/bugs_32.c
@@ -13,8 +13,6 @@
 static int host_has_cmov = 1;
 static jmp_buf cmov_test_return;
 
-#define TASK_PID(task) *((int *) &(((char *) (task))[HOST_TASK_PID]))
-
 static void cmov_sigill_test_handler(int sig)
 {
         host_has_cmov = 0;
@@ -51,7 +49,7 @@ void arch_examine_signal(int sig, struct uml_pt_regs *regs)
          * This is testing for a cmov (0x0f 0x4x) instruction causing a
          * SIGILL in init.
          */
-        if ((sig != SIGILL) || (TASK_PID(get_current()) != 1))
+        if ((sig != SIGILL) || (get_current_pid() != 1))
                 return;
 
         if (copy_from_user_proc(tmp, (void *) UPT_IP(regs), 2)) {