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mm: fix atomic_t overflow in vm

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The atomic_t type is 32bit but a 64bit system can have more than 2^32
pages of virtual address space available.  Without this we overflow on
ludicrously large mappings

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alan Cox 2008-05-23 13:04:31 -07:00 • committed by Linus Torvalds
parent 6c7c6afbb8
commit 80119ef5c8
5 changed files with 9 additions and 9 deletions
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4
include/linux/mman.h
View file

@ -17,14 +17,14 @@
extern int sysctl_overcommit_memory;
extern int sysctl_overcommit_ratio;
extern atomic_t vm_committed_space;
extern atomic_long_t vm_committed_space;
#ifdef CONFIG_SMP
extern void vm_acct_memory(long pages);
#else
static inline void vm_acct_memory(long pages)
{
atomic_add(pages, &vm_committed_space);
atomic_long_add(pages, &vm_committed_space);
}
#endif