[PATCH] uml: clean up address space limits code

I was looking at the code of the UML and more precisely at the functions
set_task_sizes_tt and set_task_sizes_skas.  I noticed that these 2 functions
take a paramater (arg) which is not used : the function is always called with
the value 0.

I suppose that this value might change in the future (or even can be
configured), so I added a constant in mem_user.h file.

Also, I rounded CONFIG_HOST_TASk_SIZE to a 4M.

Signed-off-by: Tyler <tyler@agat.net>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

5 files changed, 10 insertions, 32 deletions

diff --git a/arch/um/include/skas/mode_kern_skas.h b/arch/um/include/skas/mode_kern_skas.h
index 63c58739bde0..651350adfe03 100644
--- a/arch/um/include/skas/mode_kern_skas.h
+++ b/arch/um/include/skas/mode_kern_skas.h
@@ -29,7 +29,7 @@ extern void flush_tlb_mm_skas(struct mm_struct *mm);
 extern void force_flush_all_skas(void);
 extern long execute_syscall_skas(void *r);
 extern void before_mem_skas(unsigned long unused);
-extern unsigned long set_task_sizes_skas(int arg, unsigned long *host_size_out,
+extern unsigned long set_task_sizes_skas(unsigned long *host_size_out,
                                          unsigned long *task_size_out);
 extern int start_uml_skas(void);
 extern int external_pid_skas(struct task_struct *task);
diff --git a/arch/um/include/tt/mode_kern_tt.h b/arch/um/include/tt/mode_kern_tt.h
index efa0012550d0..fb2d3d76685a 100644
--- a/arch/um/include/tt/mode_kern_tt.h
+++ b/arch/um/include/tt/mode_kern_tt.h
@@ -30,7 +30,7 @@ extern void flush_tlb_mm_tt(struct mm_struct *mm);
 extern void force_flush_all_tt(void);
 extern long execute_syscall_tt(void *r);
 extern void before_mem_tt(unsigned long brk_start);
-extern unsigned long set_task_sizes_tt(int arg, unsigned long *host_size_out,
+extern unsigned long set_task_sizes_tt(unsigned long *host_size_out,
                                        unsigned long *task_size_out);
 extern int start_uml_tt(void);
 extern int external_pid_tt(struct task_struct *task);
diff --git a/arch/um/kernel/skas/mem.c b/arch/um/kernel/skas/mem.c
index 88ab96c609ce..7e5b8f165cf2 100644
--- a/arch/um/kernel/skas/mem.c
+++ b/arch/um/kernel/skas/mem.c
@@ -9,14 +9,14 @@
 #include "mem_user.h"
 #include "skas.h"
 
-unsigned long set_task_sizes_skas(int arg, unsigned long *host_size_out, 
+unsigned long set_task_sizes_skas(unsigned long *host_size_out,
                                   unsigned long *task_size_out)
 {
         /* Round up to the nearest 4M */
-        unsigned long top = ROUND_4M((unsigned long) &arg);
+        unsigned long top = ROUND_4M((unsigned long) &host_size_out);
 
 #ifdef CONFIG_HOST_TASK_SIZE
-        *host_size_out = CONFIG_HOST_TASK_SIZE;
+        *host_size_out = ROUND_4M(CONFIG_HOST_TASK_SIZE);
         *task_size_out = CONFIG_HOST_TASK_SIZE;
 #else
         *host_size_out = top;
@@ -24,16 +24,5 @@ unsigned long set_task_sizes_skas(int arg, unsigned long *host_size_out,
                 *task_size_out = top;
         else *task_size_out = CONFIG_STUB_START & PGDIR_MASK;
 #endif
-        return(((unsigned long) set_task_sizes_skas) & ~0xffffff);
+        return ((unsigned long) set_task_sizes_skas) & ~0xffffff;
 }
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/kernel/tt/mem.c b/arch/um/kernel/tt/mem.c
index bcb8796c3cb1..4ae8c5c1e3b3 100644
--- a/arch/um/kernel/tt/mem.c
+++ b/arch/um/kernel/tt/mem.c
@@ -24,22 +24,11 @@ void before_mem_tt(unsigned long brk_start)
 #define SIZE ((CONFIG_NEST_LEVEL + CONFIG_KERNEL_HALF_GIGS) * 0x20000000)
 #define START (CONFIG_TOP_ADDR - SIZE)
 
-unsigned long set_task_sizes_tt(int arg, unsigned long *host_size_out, 
+unsigned long set_task_sizes_tt(unsigned long *host_size_out,
                                 unsigned long *task_size_out)
 {
         /* Round up to the nearest 4M */
-        *host_size_out = ROUND_4M((unsigned long) &arg);
+        *host_size_out = ROUND_4M((unsigned long) &host_size_out);
         *task_size_out = START;
-        return(START);
+        return START;
 }
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index 37cfe7701f06..a50a0aac8faa 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -374,7 +374,7 @@ int linux_main(int argc, char **argv)
 
         printf("UML running in %s mode\n", mode);
 
-        uml_start = CHOOSE_MODE_PROC(set_task_sizes_tt, set_task_sizes_skas, 0,
+        uml_start = CHOOSE_MODE_PROC(set_task_sizes_tt, set_task_sizes_skas,
                                      &host_task_size, &task_size);
 
         /*