diff options
| author | Oleksandr Suvorov <oleksandr.suvorov@toradex.com> | 2020-04-08 16:20:51 +0300 |
|---|---|---|
| committer | Oleksandr Suvorov <oleksandr.suvorov@toradex.com> | 2020-04-09 18:55:05 +0300 |
| commit | 2ecd4dcc7d5aad1bfcad77a5c6b25ede7b1fc683 (patch) | |
| tree | acc355bc973c564adace8f8cd671ae0ae26cc11b | |
| parent | ffa0566db4112477eff1203e81942a72864b6c25 (diff) | |
compat: make backports-4.18 compatible with kernel < 3.19
backports-4.18.c uses ktime_divns() function.
As ktime_divns() is not exported in kernel < 3.19, this symbol
will not be resolved on compat.ko loading.
This fixes the linking issue [1].
[1]
-------------------------------
WARNING: "ktime_divns" [compat/compat.ko] undefined!
-------------------------------
Related-to: ELB-2388
Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
| -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); + |