The patch titled
exec: create initial stack independent of PAGE_SIZE
has been added to the -mm tree. Its filename is
exec-create-initial-stack-independent-of-page_size.patch
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------------------------------------------------------
Subject: exec: create initial stack independent of PAGE_SIZE
From: Michael Neuling <mikey@xxxxxxxxxxx>
Currently we create the initial stack based on the PAGE_SIZE. This is
unnecessary.
This creates this initial stack independent of the PAGE_SIZE.
It also bumps up the number of 4k pages allocated from 20 to 32, to
align with 64K page systems.
Signed-off-by: Michael Neuling <mikey@xxxxxxxxxxx>
Cc: Helge Deller <deller@xxxxxx>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Cc: Americo Wang <xiyou.wangcong@xxxxxxxxx>
Cc: Anton Blanchard <anton@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/exec.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff -puN fs/exec.c~exec-create-initial-stack-independent-of-page_size fs/exec.c
--- a/fs/exec.c~exec-create-initial-stack-independent-of-page_size
+++ a/fs/exec.c
@@ -556,8 +556,6 @@ static int shift_arg_pages(struct vm_are
return 0;
}
-#define EXTRA_STACK_VM_PAGES 20 /* random */
-
/*
* Finalizes the stack vm_area_struct. The flags and permissions are updated,
* the stack is optionally relocated, and some extra space is added.
@@ -632,7 +630,7 @@ int setup_arg_pages(struct linux_binprm
goto out_unlock;
}
- stack_expand = EXTRA_STACK_VM_PAGES * PAGE_SIZE;
+ stack_expand = 131072UL; /* randomly 32*4k (or 2*64k) pages */
stack_size = vma->vm_end - vma->vm_start;
/*
* Align this down to a page boundary as expand_stack
_
Patches currently in -mm which might be from mikey@xxxxxxxxxxx are
origin.patch
linux-next.patch
exec-create-initial-stack-independent-of-page_size.patch
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