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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 <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Alan Cox 2008-05-23 13:04:31 -07:00 • committed by Linus Torvalds
commit 80119ef5c8
5 changed files with 9 additions and 9 deletions
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4
mm/swap.c
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@ -503,7 +503,7 @@ void vm_acct_memory(long pages)
local = &__get_cpu_var(committed_space);
*local += pages;
if (*local > ACCT_THRESHOLD || *local < -ACCT_THRESHOLD) {
atomic_add(*local, &vm_committed_space);
atomic_long_add(*local, &vm_committed_space);
*local = 0;
}
preempt_enable();
@ -520,7 +520,7 @@ static int cpu_swap_callback(struct notifier_block *nfb,
committed = &per_cpu(committed_space, (long)hcpu);
if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) {
atomic_add(*committed, &vm_committed_space);
atomic_long_add(*committed, &vm_committed_space);
*committed = 0;
drain_cpu_pagevecs((long)hcpu);
}