From: Ian Munsie <imun...@au1.ibm.com>
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 <imun...@au1.ibm.com>
---
drivers/misc/cxl/native.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/misc/cxl/native.c b/drivers/misc/cxl/native.c
index e80d8f7..120c468 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;
--
2.8.1
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