freebsd-nq/module/spl
Brian Behlendorf a4bfd8ea1b Add __divdi3(), remove __udivdi3() kernel dependency
Up until now no SPL consumer attempted to perform signed 64-bit
division so there was no need to support this.  That has now
changed so I adding 64-bit division support for 32-bit platforms.
The signed implementation is based on the unsigned version.

Since the have been several bug reports in the past concerning
correct 64-bit division on 32-bit platforms I added some long
over due regression tests.  Much to my surprise the unsigned
64-bit division regression tests failed.

This was surprising because __udivdi3() was implemented by simply
calling div64_u64() which is provided by the kernel.  This meant
that the linux kernels 64-bit division algorithm on 32-bit platforms
was flawed.  After some investigation this turned out to be exactly
the case.

Because of this I was forced to abandon the kernel helper and
instead to fully implement 64-bit division in the spl.  There are
several published implementation out there on how to do this
properly and I settled on one proposed in the book Hacker's Delight.
Their proposed algoritm is freely available without restriction
and I have just modified it to be linux kernel friendly.

The update implementation now passed all the unsigned and signed
regression tests.  This should be functional, but not fast, which is
good enough for out purposes.  If you want fast too I'd strongly
suggest you upgrade to a 64-bit platform.  I have also reported the
kernel bug and we'll see if we can't get it fixed up stream.
2010-07-13 16:44:02 -07:00
..
.gitignore sun-misc-gitignore 2010-01-08 09:37:54 -08:00
Makefile.in Add basic credential support and splat tests. 2009-07-27 17:18:59 -07:00
spl-atomic.c Public Release Prep 2010-05-17 15:18:00 -07:00
spl-condvar.c Public Release Prep 2010-05-17 15:18:00 -07:00
spl-cred.c Public Release Prep 2010-05-17 15:18:00 -07:00
spl-debug.c Cleanly split Linux proc.h (fs) from conflicting Solaris proc.h (process) 2010-06-11 15:57:25 -07:00
spl-err.c Public Release Prep 2010-05-17 15:18:00 -07:00
spl-generic.c Add __divdi3(), remove __udivdi3() kernel dependency 2010-07-13 16:44:02 -07:00
spl-kmem.c Add kmem_vasprintf function 2010-06-24 09:41:59 -07:00
spl-kobj.c Public Release Prep 2010-05-17 15:18:00 -07:00
spl-kstat.c Cleanly split Linux proc.h (fs) from conflicting Solaris proc.h (process) 2010-06-11 15:57:25 -07:00
spl-module.c Public Release Prep 2010-05-17 15:18:00 -07:00
spl-mutex.c Public Release Prep 2010-05-17 15:18:00 -07:00
spl-proc.c Linux-2.6.33 compat, .ctl_name removed from struct ctl_table 2010-06-30 12:49:12 -07:00
spl-rwlock.c Public Release Prep 2010-05-17 15:18:00 -07:00
spl-taskq.c Implementation of the TQ_FRONT flag. 2010-07-01 10:59:38 -07:00
spl-thread.c Cleanly split Linux proc.h (fs) from conflicting Solaris proc.h (process) 2010-06-11 15:57:25 -07:00
spl-time.c Minor 32-bit fix cast to hrtime_t before the mutliply. 2010-05-23 09:51:17 -07:00
spl-vnode.c Add configure check for user_path_dir() 2010-07-01 13:53:26 -07:00
spl-xdr.c Public Release Prep 2010-05-17 15:18:00 -07:00