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| author | Arnd Bergmann <arnd@arndb.de> | 2017-03-01 12:15:29 +0300 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2017-03-01 17:15:10 +0300 |
| commit | 3736d4eb6af37492aeded7fec0072dedd959c842 (patch) | |
| tree | 20d8d96e44e8af895e3dee3003db3d0ba10c1088 | |
| parent | 8d5755b3f77b57447ce5de253ef704ad028474d3 (diff) | |
| download | linux-3736d4eb6af37492aeded7fec0072dedd959c842.tar.xz | |
watchdog: kempld: fix gcc-4.3 build
gcc-4.3 can't decide whether the constant value in
kempld_prescaler[PRESCALER_21] is built-time constant or
not, and gets confused by the logic in do_div():
drivers/watchdog/kempld_wdt.o: In function `kempld_wdt_set_stage_timeout':
kempld_wdt.c:(.text.kempld_wdt_set_stage_timeout+0x130): undefined reference to `__aeabi_uldivmod'
This adds a call to ACCESS_ONCE() to force it to not consider
it to be constant, and leaves the more efficient normal case
in place for modern compilers, using an #ifdef to annotate
why we do this hack.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
| -rw-r--r-- | drivers/watchdog/kempld_wdt.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/watchdog/kempld_wdt.c b/drivers/watchdog/kempld_wdt.c index 73c46b3a09ab..2f3b049ea301 100644 --- a/drivers/watchdog/kempld_wdt.c +++ b/drivers/watchdog/kempld_wdt.c @@ -140,12 +140,19 @@ static int kempld_wdt_set_stage_timeout(struct kempld_wdt_data *wdt_data, unsigned int timeout) { struct kempld_device_data *pld = wdt_data->pld; - u32 prescaler = kempld_prescaler[PRESCALER_21]; + u32 prescaler; u64 stage_timeout64; u32 stage_timeout; u32 remainder; u8 stage_cfg; +#if GCC_VERSION < 40400 + /* work around a bug compiling do_div() */ + prescaler = READ_ONCE(kempld_prescaler[PRESCALER_21]); +#else + prescaler = kempld_prescaler[PRESCALER_21]; +#endif + if (!stage) return -EINVAL; |