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uml: physical memory shouldn't include initial stack 

The top of physical memory should be below the initial process stack, not the
top of the address space, at least for as long as the stack isn't known to the
kernel VM system and appropriately reserved.

Cc: "Christopher S. Aker" <caker@theshore.net>
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: WANG Cong <xiyou.wangcong@gmail.com>
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 2008-05-12 14:01:57 -07:00 committed by Linus Torvalds
parent a7dfa9403b
commit 60a2988aea
1 changed files with 4 additions and 1 deletions
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5
arch/um/kernel/um_arch.c
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@ -258,6 +258,7 @@ int __init linux_main(int argc, char **argv)
{
unsigned long avail, diff;
unsigned long virtmem_size, max_physmem;
unsigned long stack;
unsigned int i;
int add;
char * mode;
@ -348,7 +349,9 @@ int __init linux_main(int argc, char **argv)
}
virtmem_size = physmem_size;
avail = TASK_SIZE - start_vm;
stack = (unsigned long) argv;
stack &= ~(1024 * 1024 - 1);
avail = stack - start_vm;
if (physmem_size > avail)
virtmem_size = avail;
end_vm = start_vm + virtmem_size;