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[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>
This commit is contained in:
Tyler 2006-07-10 04:45:03 -07:00 committed by Linus Torvalds
parent 5f49d72478
commit 598d188af1
5 changed files with 10 additions and 32 deletions
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2
arch/um/include/skas/mode_kern_skas.h
View File

@ -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);

2
arch/um/include/tt/mode_kern_tt.h
View File

@ -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);

19
arch/um/kernel/skas/mem.c
View File

@ -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:
*/

17
arch/um/kernel/tt/mem.c
View File

@ -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:
*/

2
arch/um/kernel/um_arch.c
View File

@ -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);
/*