On Fri, Mar 26, 2010 at 11:43:15AM +0000, Alexander Leidinger wrote: > Author: netchild > Date: Fri Mar 26 11:43:15 2010 > New Revision: 205683 > URL: http://svn.freebsd.org/changeset/base/205683 > > Log: > Fix some bogus values in linprocfs. > > Submitted by: Petr Salinger <petr.salin...@seznam.cz> > Verified on: GNU/kFreeBSD debian 8.0-1-686 (by submitter) > PR: 144584 > > Modified: > head/sys/compat/linprocfs/linprocfs.c > > Modified: head/sys/compat/linprocfs/linprocfs.c > ============================================================================== > --- head/sys/compat/linprocfs/linprocfs.c Fri Mar 26 11:33:12 2010 > (r205682) > +++ head/sys/compat/linprocfs/linprocfs.c Fri Mar 26 11:43:15 2010 > (r205683) > @@ -110,13 +110,36 @@ __FBSDID("$FreeBSD$"); > /* > * Various conversion macros > */ > + > +/* The LINUX_USER_HZ is assumed 100 for now */ > + > +#if defined(__i386__) && defined(__GNUCLIKE_ASM) > +/* we need intermediate result as 64 bit, otherwise it overflows too early */ > +#define DO64_MULDIV(v,m,d) \ > +({ \ > + unsigned long rv0; \ > + unsigned long rv1; \ > + __asm__ __volatile__( \ > + "mull %1\n\t" \ > + "divl %2\n\t" \ > + :"=a" (rv0), "=d" (rv1) \ > + :"r" (d), "0" (v), "1" (m) \ > + :"cc" ); \ > + rv0; \ > +})
Why it is impossible to express the calculation in C ?
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