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uml: remove task_protections 

Replaced task_protections with stack_protections since they do the same
thing, and task_protections was misnamed anyway.

This needs THREAD_SIZE, so that's imported via common-offsets.h

Also tidied up the code in the vicinity.

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>
This commit is contained in:
Jeff Dike 2007-05-10 22:22:30 -07:00 committed by Linus Torvalds
parent 22258d406f
commit 57598fd7b3
6 changed files with 8 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/um/include/common-offsets.h
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@ -28,3 +28,5 @@ DEFINE(UM_NR_CPUS, NR_CPUS);
/* For crypto assembler code. */
DEFINE(crypto_tfm_ctx_offset, offsetof(struct crypto_tfm, __crt_ctx));
DEFINE(UM_THREAD_SIZE, THREAD_SIZE);

1
arch/um/include/os.h
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@ -272,7 +272,6 @@ extern void do_longjmp(void *p, int val);
/* util.c */
extern void stack_protections(unsigned long address);
extern void task_protections(unsigned long address);
extern int raw(int fd);
extern void setup_machinename(char *machine_out);
extern void setup_hostinfo(char *buf, int len);

2
arch/um/kernel/tt/exec_kern.c
View File

@ -57,7 +57,7 @@ void flush_thread_tt(void)
enable_timer();
free_page(stack);
protect_memory(uml_reserved, high_physmem - uml_reserved, 1, 1, 0, 1);
task_protections((unsigned long) current_thread);
stack_protections((unsigned long) current_thread);
force_flush_all();
unblock_signals();
}

2
arch/um/kernel/tt/process_kern.c
View File

@ -209,7 +209,7 @@ void finish_fork_handler(int sig)
if(current->mm != current->parent->mm)
protect_memory(uml_reserved, high_physmem - uml_reserved, 1,
1, 0, 1);
task_protections((unsigned long) current_thread);
stack_protections((unsigned long) current_thread);
free_page(current->thread.temp_stack);
local_irq_disable();

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

@ -459,7 +459,7 @@ int __init linux_main(int argc, char **argv)
uml_postsetup();
task_protections((unsigned long) &init_thread_info);
stack_protections((unsigned long) &init_thread_info);
os_flush_stdout();
return CHOOSE_MODE(start_uml_tt(), start_uml_skas());

23
arch/um/os-Linux/util.c
View File

@ -33,25 +33,8 @@
void stack_protections(unsigned long address)
{
int prot = PROT_READ | PROT_WRITE | PROT_EXEC;
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 + UM_KERN_PAGE_SIZE;
unsigned long stack = guard + UM_KERN_PAGE_SIZE;
int prot = 0, pages;
#ifdef notdef
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 * UM_KERN_PAGE_SIZE, prot) < 0)
if(mprotect((void *) address, UM_THREAD_SIZE,
PROT_READ | PROT_WRITE | PROT_EXEC) < 0)
panic("protecting stack failed, errno = %d", errno);
}
@ -72,7 +55,7 @@ int raw(int fd)
/* XXX tcsetattr could have applied only some changes
* (and cfmakeraw() is a set of changes) */
return(0);
return 0;
}
void setup_machinename(char *machine_out)