On Wed, 2004-03-17 at 09:38 -0500, Alan Cox wrote: > On Wed, Mar 17, 2004 at 12:47:13AM +0100, Earle Robert Nietzel wrote: > > Come to find out that in "arch/i386/Makefile": > > > > CFLAGS += -pipe -mregparm=3 -msoft-float -fno-builtin-sprintf -fno- > > builtin-log2 -fno-builtin-puts > > > > You'll notice "-mregparm=3"? > > > > After removing this compiler flag my binary modules began to load > > correctly. > > > > Anyone care to comment on this? > > Your binary modules need to match the kernel. -mregparm=3 tells the > kernel to try and use registers for some of the argument passing, and > thus be more efficient I patched the ATI fglrx driver so that it compiles with -mregparm=3 and the performance difference is noticably faster. I understand the reason for using fastcalls but could you explain the syntax implementation? For example I know GCC uses a __attribute__((cdecl)) but the actual details behind this are not obvious to me. Thanks for your time and patience!
