Messages in this thread | | | Date | Mon, 16 Mar 2009 15:35:29 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [crash] Re: Latest brk patchset |
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Jeremy Fitzhardinge wrote: > H. Peter Anvin wrote: >> Or simplified: >> >> PAGE_TABLE_SIZE(((1 << 32)-PAGE_OFFSET) >> PAGE_SHIFT) << PAGE_SHIFT > > Was worried about 1<<32 overflowing. Never really sure what gas's type > system is. >
It's bignum-based.
You could also write:
PAGE_TABLE_SIZE((-PAGE_OFFSET & 0xffffffff) >> PAGE_SHIFT) << PAGE_SHIFT
(the & 0xffffffff is necessary, or you'll get a signed shift.)
-hpa
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