summaryrefslogtreecommitdiffstats
path: root/drivers/misc
diff options
context:
space:
mode:
authorIan Munsie <imunsie@au1.ibm.com>2016-06-29 22:16:26 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2016-07-08 22:10:44 +1000
commit2224b6719b09052a9fbf29422a0e9b4f42407c35 (patch)
treea64dfc31e0088296859c867bf3c9d2035599e095 /drivers/misc
parent49e9c99f47fc43abc9598f9fcf5ba3336d0c09a6 (diff)
downloadlinux-2224b6719b09052a9fbf29422a0e9b4f42407c35.tar.bz2
cxl: Fix allocating a minimum of 2 pages for the SPA
The Scheduled Process Area is allocated dynamically with enough pages to fit at least as many processes as the AFU descriptor indicated. Since the calculation is non-trivial, it does this by calculating how many processes could fit in an allocation of a given order, and increasing that order until it can fit enough processes or hits the maximum supported size. Currently, it will start this search using a SPA of 2 pages instead of 1. This can waste a page of memory if the AFU's maximum number of supported processes was small enough to fit in one page. Fix the algorithm to start the search at 1 page. Signed-off-by: Ian Munsie <imunsie@au1.ibm.com> Reviewed-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com> Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/cxl/native.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/misc/cxl/native.c b/drivers/misc/cxl/native.c
index e80d8f7d4dcb..120c468ee9e0 100644
--- a/drivers/misc/cxl/native.c
+++ b/drivers/misc/cxl/native.c
@@ -189,7 +189,7 @@ int cxl_alloc_spa(struct cxl_afu *afu)
unsigned spa_size;
/* Work out how many pages to allocate */
- afu->native->spa_order = 0;
+ afu->native->spa_order = -1;
do {
afu->native->spa_order++;
spa_size = (1 << afu->native->spa_order) * PAGE_SIZE;