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If the input is out of the range of the allowed values, either larger
than the largest value or closer to zero than the smallest non-zero
allowed value, then a division by zero would occur.
In the case of input too large, the division by zero will occur on the
first iteration. The best result (largest allowed value) will be found
by always choosing the semi-convergent and excluding the denominator
based limit when finding it.
In the case of the input too small, the division by zero will occur on
the second iteration. The numerator based semi-convergent should not be
calculated to avoid the division by zero. But the semi-convergent vs
previous convergent test is still needed, which effectively chooses
between 0 (the previous convergent) vs the smallest allowed fraction
(best semi-convergent) as the result.
Fixes: 323dd2c3ed0 ("lib/math/rational.c: fix possible incorrect result from rational fractions helper")
Reported-by: Yiyuan Guo <yguoaz@gmail.com>
Signed-off-by: Trent Piepho <tpiepho@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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Import rational_best_approximation() from Linux. This is used by an
upcoming update of the clk_fractional_divider code.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20210602095507.24609-12-s.hauer@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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f933da28cf3f ("include: <linux/math64.h>: sync with upstream") imported
the div64 code from Linux, which also defines __div64_32 as a weak
symbol. __div64_32 was defined before in a separate file though and used
from do_div. Remove this duplication.
No functional change.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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The header implements definitions for the 64-bit division helpers
on 64-bit builds only. For 32-bit builds, it can only provide prototypes
and the actual implementation will need to come from elsewhere.
We didn't have any out-of-line definitions in barebox with the result
that functions like div_s64_rem() were so far only usable in
64-bit barebox builds. On 32-bit builds, they would result in a linker
error.
Import the Linux v5.11-rc1 generic out-of-line 64-bit math on 32-bit
implementation to fix this. While at it, synchronize the header to
reduce diff to upstream.
Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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