while reading several files, I found a potential infinite loop in the
shrink_mmap() function (mm/filemap.c). Perhaps conditions make this loop
impossible, I don't know this enough to judge, but I see a loop which looks like
do {
some stuff;
sometimes continue;
count--;
other stuff;
} while(count > 0)
if the condition to contiune is always met, we loop indefinetely. This leads
to the question : is it guaranteed that at least sometimes, the following
3 statements are all false so that none of them continues :
if (atomic_read(&page->count) != 1) continue;
if (PageLocked(page)) continue;
if ((gfp_mask & __GFP_DMA) && !PageDMA(page)) continue;
I wonder about this because my system hanged when I had 0 swap free during
mmap002. Perhaps it was looping here ...
if I'm completely wrong, please excuse me for the noise.
Willy
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