On Thu, Jun 24, 2004 at 23:28:30 +0200, Jan Hudec wrote: > On Thu, Jun 24, 2004 at 15:15:12 -0500, Timur Tabi wrote: > > If I compile my driver for the x86-64 platform, is "unsigned long" a > > 32-bit or 64-bit quantity? > > You don't want to know that ;-). And since drivers in Linux are supposed > to compile on all platforms (well, not all drivers, but most should), > you shouldn't rely on sizes on particular platforms. > > On all platforms an unsigned long will hold a void *. For most other > purposes, there are speicalized types, like off_t, size_t, ssize_t etc. > There are also the s32/u32/s64/u64 types, that have those sizes on all > platforms. > > That being said, looking at include/asm-x86_64/types.h shows, that you > need long long to define s64, so long is likely to be 32 bits wide. OOPS, sorry. Overlooked something: There is a BITS_PER_LONG define in include/asm/types.h. It says 64 on x86-64 ------------------------------------------------------------------------------- Jan 'Bulb' Hudec <bulb@ucw.cz>
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