From: Thierry Reding <treding@xxxxxxxxxx>
The semantics of do_div() are (see include/asm-generic/div64.h):
uint32_t do_div(uint64_t *n, uint32_t base)
Using a different type will therefore cause the following warning (as
seen on xtensa/allmodconfig):
CC [M] drivers/gpu/drm/nouveau/core/subdev/clock/gk20a.o
In file included from arch/xtensa/include/generated/asm/div64.h:1:0,
from include/linux/kernel.h:124,
from include/linux/list.h:8,
from include/linux/preempt.h:10,
from include/linux/spinlock.h:50,
from include/linux/mmzone.h:7,
from include/linux/gfp.h:5,
from include/linux/slab.h:14,
from drivers/gpu/drm/nouveau/core/os.h:5,
from drivers/gpu/drm/nouveau/core/include/core/object.h:4,
from drivers/gpu/drm/nouveau/core/include/core/device.h:4,
from drivers/gpu/drm/nouveau/core/include/subdev/clock.h:4,
from drivers/gpu/drm/nouveau/core/subdev/clock/gk20a.c:90:
drivers/gpu/drm/nouveau/core/subdev/clock/gk20a.c: In function 'gk20a_pllg_calc_rate':
include/asm-generic/div64.h:43:28: warning: comparison of distinct pointer types lacks a cast
(void)(((typeof((n)) *)0) == ((uint64_t *)0)); \
^
drivers/gpu/drm/nouveau/core/subdev/clock/gk20a.c:146:2: note: in expansion of macro 'do_div'
do_div(rate, divider);
^
drivers/gpu/drm/nouveau/core/subdev/clock/gk20a.c:146:2: warning: right shift count >= width of type
In file included from arch/xtensa/include/generated/asm/div64.h:1:0,
from include/linux/kernel.h:124,
from include/linux/list.h:8,
from include/linux/preempt.h:10,
from include/linux/spinlock.h:50,
from include/linux/mmzone.h:7,
from include/linux/gfp.h:5,
from include/linux/slab.h:14,
from drivers/gpu/drm/nouveau/core/os.h:5,
from drivers/gpu/drm/nouveau/core/include/core/object.h:4,
from drivers/gpu/drm/nouveau/core/include/core/device.h:4,
from drivers/gpu/drm/nouveau/core/include/subdev/clock.h:4,
from drivers/gpu/drm/nouveau/core/subdev/clock/gk20a.c:90:
include/asm-generic/div64.h:48:11: warning: passing argument 1 of '__div64_32' from incompatible pointer type
__rem = __div64_32(&(n), __base); \
^
drivers/gpu/drm/nouveau/core/subdev/clock/gk20a.c:146:2: note: in expansion of macro 'do_div'
do_div(rate, divider);
^
include/asm-generic/div64.h:35:17: note: expected 'uint64_t *' but argument is of type 'u32 *'
extern uint32_t __div64_32(uint64_t *dividend, uint32_t divisor);
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
drivers/gpu/drm/nouveau/core/subdev/clock/gk20a.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/nouveau/core/subdev/clock/gk20a.c b/drivers/gpu/drm/nouveau/core/subdev/clock/gk20a.c
index 425a8d5e9129..c571437afbd2 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/clock/gk20a.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/clock/gk20a.c
@@ -138,7 +138,7 @@ gk20a_pllg_read_mnp(struct gk20a_clock_priv *priv)
static u32
gk20a_pllg_calc_rate(struct gk20a_clock_priv *priv)
{
- u32 rate;
+ u64 rate;
u32 divider;
rate = priv->parent_rate * priv->n;
--
2.1.0
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