diff options
Diffstat (limited to 'compat/backport-4.18.c')
| -rw-r--r-- | compat/backport-4.18.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/compat/backport-4.18.c b/compat/backport-4.18.c index c47fabe..40551c7 100644 --- a/compat/backport-4.18.c +++ b/compat/backport-4.18.c @@ -1,11 +1,47 @@ /* * Copyright (C) 2018 Intel Corporation + * Copyright (c) 2020 Toradex */ #include <linux/hrtimer.h> +/* + * Before the commit 8b618628b2b the ktime_divns was non-exported function. + * Add the simple implementation of ktime_divns() to use in + * ktime_get_boottime_seconds(). + */ +#if LINUX_VERSION_IS_LESS(3,19,0) + +#include <linux/ktime.h> + +#if BITS_PER_LONG < 64 +/* + * Divide a ktime value by a nanosecond value + */ +u64 ktime_divns(const ktime_t kt, s64 div) +{ + int sft = 0; + s64 dclc; + u64 tmp; + + dclc = ktime_to_ns(kt); + tmp = dclc < 0 ? -dclc : dclc; + + /* Make sure the divisor is less than 2^32: */ + while (div >> 32) { + sft++; + div >>= 1; + } + tmp >>= sft; + do_div(tmp, (unsigned long) div); + return dclc < 0 ? -tmp : tmp; +} +#endif /* BITS_PER_LONG >= 64 */ +#endif /* < 3.19 */ + time64_t ktime_get_boottime_seconds(void) { return ktime_divns(ktime_get_boottime(), NSEC_PER_SEC); } EXPORT_SYMBOL_GPL(ktime_get_boottime_seconds); + |