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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>
This commit is contained in:
Ian Munsie 2016-06-29 22:16:26 +10:00 committed by Michael Ellerman
parent 49e9c99f47
commit 2224b6719b
1 changed files with 1 additions and 1 deletions
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2
drivers/misc/cxl/native.c
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@ -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;