linux-kernel - [PATCH] drm/ttm: fix the type mismatch error on sparc64

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Date:   Tue, 7 Sep 2021 18:03:02 +0800
From:   Huang Rui <ray.huang@....com>
To:     Christian König <christian.koenig@....com>,
        "Daniel Vetter" <daniel.vetter@...ll.ch>,
        <dri-devel@...ts.freedesktop.org>
CC:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        <linux-kernel@...r.kernel.org>, <sparclinux@...r.kernel.org>,
        Huang Rui <ray.huang@....com>
Subject: [PATCH] drm/ttm: fix the type mismatch error on sparc64

__fls() on sparc64 return "int", but here it is expected as "unsigned
long" (x86). It will cause the build errors because the warning becomes
fatal while it is using sparc configuration. As suggested by Linus, it
can use min_t instead of min to force the type as "unsigned int".

Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Huang Rui <ray.huang@....com>
Cc: Christian König <christian.koenig@....com>
---
 drivers/gpu/drm/ttm/ttm_pool.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c
index af1b41369626..c961a788b519 100644
--- a/drivers/gpu/drm/ttm/ttm_pool.c
+++ b/drivers/gpu/drm/ttm/ttm_pool.c
@@ -382,7 +382,8 @@ int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
 	else
 		gfp_flags |= GFP_HIGHUSER;
 
-	for (order = min(MAX_ORDER - 1UL, __fls(num_pages)); num_pages;
+	for (order = min_t(unsigned int, MAX_ORDER - 1, __fls(num_pages));
+	     num_pages;
 	     order = min_t(unsigned int, order, __fls(num_pages))) {
 		bool apply_caching = false;
 		struct ttm_pool_type *pt;
-- 
2.25.1