diff options
| author | Nathan Chancellor <nathan@kernel.org> | 2023-08-15 12:06:50 -0700 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@linux-watchdog.org> | 2023-08-19 17:36:18 +0200 |
| commit | 98334dc292fddba043fef8f6ebc84b22d42baca9 (patch) | |
| tree | 0cc20ba365266b4bb56935f8515e4438362844c7 /drivers/watchdog | |
| parent | 8b3c3662186046c440ffbb7f5efc5595b1696e9d (diff) | |
| download | linux-98334dc292fddba043fef8f6ebc84b22d42baca9.tar.gz | |
watchdog: xilinx_wwdt: Use div_u64() in xilinx_wwdt_start()
After commit f1a43aadb5a6 ("watchdog: Enable COMPILE_TEST for more
drivers"), it is possible to enable this driver on 32-bit architectures.
When building for those architectures with clang, there is an error due
to a 64-bit division in xilinx_wwdt_start():
ERROR: modpost: "__aeabi_uldivmod" [drivers/watchdog/xilinx_wwdt.ko] undefined!
Use div_u64() to fix this, which takes a 64-bit dividend and 32-bit
divisor. GCC likely avoids the same error due to optimizations it
employs to transform division by a constant into other equivalent
operations, which may be different than what is implemented in clang.
Link: https://github.com/ClangBuiltLinux/linux/issues/1915
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20230815-watchdog-xilinx-div_u64-v1-1-20b0b5a65c2e@kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/xilinx_wwdt.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/watchdog/xilinx_wwdt.c b/drivers/watchdog/xilinx_wwdt.c index 1d998db415335..d271e2e8d6e27 100644 --- a/drivers/watchdog/xilinx_wwdt.c +++ b/drivers/watchdog/xilinx_wwdt.c @@ -9,6 +9,7 @@ #include <linux/interrupt.h> #include <linux/io.h> #include <linux/ioport.h> +#include <linux/math64.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/platform_device.h> @@ -71,7 +72,7 @@ static int xilinx_wwdt_start(struct watchdog_device *wdd) /* Calculate timeout count */ time_out = xdev->freq * wdd->timeout; - closed_timeout = (time_out * xdev->close_percent) / 100; + closed_timeout = div_u64(time_out * xdev->close_percent, 100); open_timeout = time_out - closed_timeout; wdd->min_hw_heartbeat_ms = xdev->close_percent * 10 * wdd->timeout; |