[PATCH] redundant call to vm_enough_memory

From: Werner Almesberger (Werner.Almesberger@epfl.ch)
Date: Thu Feb 08 2001 - 19:42:27 EST

This patch removes a redundant call to vm_enough_memory from
mm/mmap.c:sys_brk. Exactly the same test is made in mm/mmap.c:do_brk,
with the exception that the latter is done after calling do_munmap.

Note that do_munmap in do_brk has no effect when called from sys_brk,
because the check for find_vma_intersection only lets us pass if there
are no memory objects in the way.

The patch is for 2.4.2-pre1, with my /proc/sys/vm/max_map_count patch
applied. (The latter only changes some offsets, not the context of this

- Werner

------------------------------------ patch ------------------------------------

--- linux.orig/mm/mmap.c Mon Jan 29 17:10:41 2001
+++ linux/mm/mmap.c Fri Feb 9 01:12:55 2001
@@ -148,10 +149,6 @@
         if (find_vma_intersection(mm, oldbrk, newbrk+PAGE_SIZE))
                 goto out;
- /* Check if we have enough memory.. */
- if (!vm_enough_memory((newbrk-oldbrk) >> PAGE_SHIFT))
- goto out;
         /* Ok, looks good - let it rip. */
         if (do_brk(oldbrk, newbrk-oldbrk) != oldbrk)
                 goto out;

 / Werner Almesberger, ICA, EPFL, CH           Werner.Almesberger@epfl.ch /
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This archive was generated by hypermail 2b29 : Thu Feb 15 2001 - 21:00:13 EST