Quoting Kostik Belousov <kostik...@gmail.com> (from Fri, 26 Mar 2010
13:49:25 +0200):
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 ?
You forgot to CC the submitter... CCed.
What do you have in mind, (unsinged long)((uint64_t)v * (uint64_t)m /
(uint64_t)d)? Conditionally on the architecture or not?
Bye,
Alexander.
--
http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7
http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
When reviewing your notes before an exam, the most
important ones will be illegible.
_______________________________________________
svn-src-head@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/svn-src-head
To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
