amd64/89550: commit references a PR

[dfilter service]

The following reply was made to PR amd64/89550; it has been noted by GNATS.

From: dfilter at FreeBSD.ORG (dfilter service)
To: bug-followup at FreeBSD.org
Cc:  
Subject: Re: amd64/89550: commit references a PR
Date: Fri, 20 Jul 2007 23:02:24 +0000 (UTC)

 se          2007-07-20 23:02:01 UTC
 
   FreeBSD src repository
 
   Modified files:
     sys/dev/sym          sym_hipd.c 
   Log:
   Fix Symbios driver on amd64: Since amd64 has 64 bit pointers but the same
   4KB pages as i386, data structures that just fit in one page on i386 (and
   on 64 bit architectures with 8KB pages) can be distributed over two pages
   on amd64. This is a porblem in the case of the Symbios driver, since the
   SCRIPTS engine in the SCSI chip operates on physical addresses and needs
   physically contiguous memory. Earlier patches used contigmalloc on amd64,
   but this version replaces part of a structure by a pointer to that data.
   In order to not introduce an extra indirection for other architectures,
   the change has been made conditional on __amd64__.
   
   Earlier attempts to repair this problem are removed (i.e. the macros that
   made amd64 use contigmalloc). The fix was submitted by Jan Mikkelsen and
   modified by me to only affect amd64.
   
   PR:             89550
   Submitted by:   janm at transactionware dot com (Jan Mikkelsen)
   Approved by:    re (Hiroki Sato)
   MFC after:      2 weeks
   
   Revision  Changes    Path
   1.67      +17 -12    src/sys/dev/sym/sym_hipd.c
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