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SubjectRe: [patch] Re: Linux 2.4.5-ac6
On Fri, Jun 08, 2001 at 06:08:46PM +0200, Maciej W. Rozycki wrote:
> Still it has two loops...

Ok, here is a single loop version.

Ivan.

--- 2.4.5-ac11/mm/mmap.c Fri Jun 8 15:59:35 2001
+++ linux/mm/mmap.c Sat Jun 9 12:50:05 2001
@@ -398,27 +398,37 @@ free_vma:
static inline unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
{
struct vm_area_struct *vma;
+ unsigned long addr_limit = TASK_SIZE - len;
+ unsigned long addr1 = 0;

if (len > TASK_SIZE)
return -ENOMEM;

if (addr) {
addr = PAGE_ALIGN(addr);
- vma = find_vma(current->mm, addr);
- if (TASK_SIZE - len >= addr &&
- (!vma || addr + len <= vma->vm_start))
- return addr;
+ if (addr > TASK_UNMAPPED_BASE)
+ addr1 = addr;
+ goto find_free_area;
}
+
+default_area:
addr = PAGE_ALIGN(TASK_UNMAPPED_BASE);

+find_free_area:
for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
/* At this point: (!vma || addr < vma->vm_end). */
- if (TASK_SIZE - len < addr)
- return -ENOMEM;
+ if (addr_limit < addr)
+ break;
if (!vma || addr + len <= vma->vm_start)
return addr;
addr = vma->vm_end;
}
+ if (addr1) {
+ /* No unmapped areas above addr; try below it */
+ addr_limit = addr1;
+ goto default_area;
+ }
+ return -ENOMEM;
}
#else
extern unsigned long arch_get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
--- 2.4.5-ac11/include/linux/binfmts.h Mon Jun 4 14:19:00 2001
+++ linux/include/linux/binfmts.h Mon Jun 4 20:24:50 2001
@@ -32,6 +32,9 @@ struct linux_binprm{
unsigned long loader, exec;
};

+/* Forward declaration */
+struct mm_struct;
+
/*
* This structure defines the functions that are used to load the binary formats that
* linux accepts.
-
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