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| author | Christian König <christian.koenig@amd.com> | 2017-12-04 13:17:54 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2017-12-05 22:37:06 +0300 |
| commit | 5ff7ec02f2f306d619c661ff8fd5392d3653d407 (patch) | |
| tree | 14bc4e2f64196ad7f8cc60a80b94235a93b3b51f /drivers/gpu | |
| parent | 2bf257d662509553ae226239e7dc1c3d00636ca6 (diff) | |
| download | linux-5ff7ec02f2f306d619c661ff8fd5392d3653d407.tar.xz | |
drm/ttm: swap consecutive allocated cached pages v3
When we detect consecutive allocation of pages swap them to avoid
accidentally freeing them as huge page.
v2: use swap
v3: check if it's really the first allocated page
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Roger He <Hongbo.He@amd.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/ttm/ttm_page_alloc.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c index 116897a20514..b6f7ce286fb1 100644 --- a/drivers/gpu/drm/ttm/ttm_page_alloc.c +++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c @@ -877,7 +877,7 @@ static int ttm_get_pages(struct page **pages, unsigned npages, int flags, #endif struct list_head plist; struct page *p = NULL; - unsigned count; + unsigned count, first; int r; /* No pool for cached pages */ @@ -918,6 +918,7 @@ static int ttm_get_pages(struct page **pages, unsigned npages, int flags, } #endif + first = i; while (npages) { p = alloc_page(gfp_flags); if (!p) { @@ -925,6 +926,10 @@ static int ttm_get_pages(struct page **pages, unsigned npages, int flags, return -ENOMEM; } + /* Swap the pages if we detect consecutive order */ + if (i > first && pages[i - 1] == p - 1) + swap(p, pages[i - 1]); + pages[i++] = p; --npages; } |