From: Manish Ahuja <ahuja@austin.ibm.com>
Date: Fri, 21 Mar 2008 23:39:17 +0000 (+1100)
Subject: [POWERPC] pseries: phyp dump: Use sysfs to release reserved mem
X-Git-Tag: v2.6.26-rc1~1125^2~132
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d5a29c7a36958ddec1ae7ab685ce09a002356548;p=pandora-kernel.git

[POWERPC] pseries: phyp dump: Use sysfs to release reserved mem

Check to see if there actually is data from a previously
crashed kernel waiting.  If so, allow user-space tools to
grab the data (by reading /proc/kcore).  When user-space
finishes dumping a section, it must release that memory
by writing to sysfs. For example,

  echo "0x40000000 0x10000000" > /sys/kernel/release_region

will release 256MB starting at the 1GB.  The released memory
becomes free for general use.

Signed-off-by: Linas Vepstas <linasvepstas@gmail.com>
Signed-off-by: Manish Ahuja <mahuja@us.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
---

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