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authorJeff Dike <jdike@addtoit.com>2008-05-12 14:01:57 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-05-13 08:02:22 -0700
commit60a2988aea701a6424809a5432bf068667aac177 (patch)
treef92bef2b181ec19e8c73cd489c93a21408fab15a /arch/um/kernel
parenta7dfa9403bf3b03899d5ef5d10b0c5c3f74b0682 (diff)
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>
Diffstat (limited to 'arch/um/kernel')
-rw-r--r--arch/um/kernel/um_arch.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index 82058ac7d481..9db85b2ce698 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -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;