From: Vitaly Kuznetsov <vkuznets@redhat.com>
Date: Tue, 31 Mar 2015 18:16:40 +0000 (-0700)
Subject: Drivers: hv: hv_balloon: correctly handle val.freeram<num_pages case
X-Git-Tag: omap-for-v4.2/o2_dc~63^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ba0c444153889a9b672974d85a4a57a8eeb49fe3;p=pandora-kernel.git

Drivers: hv: hv_balloon: correctly handle val.freeram<num_pages case

'Drivers: hv: hv_balloon: refuse to balloon below the floor' fix does not
correctly handle the case when val.freeram < num_pages as val.freeram is
__kernel_ulong_t and the 'val.freeram - num_pages' value will be a huge
positive value instead of being negative.

Usually host doesn't ask us to balloon more than val.freeram but in case
he have a memory hog started after we post the last pressure report we
can get into troubles.

Suggested-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

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