tree 8158b9a7dff59c19adef53198ecd7f89dc8ac4ed
parent bca73f595a566f0262967535bb5b2ea9c4271d9a
author Christophe Lombard <clombard@linux.vnet.ibm.com> 1506413721 +0200
committer Michael Ellerman <mpe@ellerman.id.au> 1506658784 +1000

cxl: Fix memory page not handled

The in-kernel 'library' API can be called by drivers to help
interaction with an IBM XSL on a POWER9 system.

The cxllib_handle_fault() API is used to handle memory fault. All memory
pages of the specified buffer have to be handled but under certain
conditions,the last page may not be touched, and the address the
adapter is trying to access is never sent to the kernel for resolution.

This patch reworks start address of the loop with an address aligned on
the page size. In this context, the last page is not missed.

Signed-off-by: Christophe Lombard <clombard@linux.vnet.ibm.com>
Acked-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Acked-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>

Fixes: 3ced8d730063 ("cxl: Export library to support IBM XSL");
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>