From fdb1a2236b07948e83e0a777e1795d4f07e52c33 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Christian=20K=C3=B6nig?= Date: Mon, 4 Dec 2017 11:17:54 +0100 Subject: [PATCH] drm/ttm: swap consecutive allocated cached pages v3 MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Roger He Reviewed-by: Michel Dänzer Signed-off-by: Alex Deucher --- drivers/gpu/drm/ttm/ttm_page_alloc.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) 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; } -- 2.20.1