tree 94db487608b30d8c123419c19c12544686189c10
parent 34aec07c170b972a29c954b37047184bd0f9f294
author Sebastian Ott <sebott@linux.vnet.ibm.com> 1288015829 +0200
committer Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> 1288015818 +0200

[S390] chsc: consolidate memory allocations

Most wrappers around the channel subsystem call have their own logic
to allocate memory (with proper alignment) or use preallocated or
static memory. This patch converts most users of the channel
subsystem call to use the same preallocated page (proteced by a
spinlock).

Note: The sei_page which is used in our crw handler to call
"store event information" has to coexist, since
a) in crw context, while accessing the sei_page, sleeping is allowed
   (which will conflict with the spinlock protection of the chsc_page)
b) in crw context, while accessing the sei_page, channel subsystem
   calls are allowed (which itself would require the page).

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>