From: Arnd Bergmann <arnd@xxxxxxxx> [ Upstream commit 8d46603eeeb4c6abff1d2e49f2a6ae289dac765e ] It appears that do_div() once more gets confused by a complex expression that ends up not quite being constant despite __builtin_constant_p() thinking it is: ERROR: modpost: "__aeabi_uldivmod" [drivers/media/dvb-frontends/cxd2841er.ko] undefined! Use div_u64() instead, forcing the expression to be evaluated first, and making it a bit more readable. Cc: Dan Carpenter <dan.carpenter@xxxxxxxxxx> Reported-by: Naresh Kamboju <naresh.kamboju@xxxxxxxxxx> Closes: https://lore.kernel.org/linux-media/CA+G9fYvvNm-aYodLaAwwTjEGtX0YxR-1R14FOA5aHKt0sSVsYg@xxxxxxxxxxxxxx/ Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx> Closes: https://lore.kernel.org/linux-media/CA+G9fYvvNm-aYodLaAwwTjEGtX0YxR-1R14FOA5aHKt0sSVsYg@xxxxxxxxxxxxxx/ Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> Signed-off-by: Hans Verkuil <hverkuil@xxxxxxxxx> [hverkuil: added Closes tags] Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/media/dvb-frontends/cxd2841er.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/drivers/media/dvb-frontends/cxd2841er.c b/drivers/media/dvb-frontends/cxd2841er.c index 493ba8b6b8f62..b2c251135ce1c 100644 --- a/drivers/media/dvb-frontends/cxd2841er.c +++ b/drivers/media/dvb-frontends/cxd2841er.c @@ -311,12 +311,8 @@ static int cxd2841er_set_reg_bits(struct cxd2841er_priv *priv, static u32 cxd2841er_calc_iffreq_xtal(enum cxd2841er_xtal xtal, u32 ifhz) { - u64 tmp; - - tmp = (u64) ifhz * 16777216; - do_div(tmp, ((xtal == SONY_XTAL_24000) ? 48000000 : 41000000)); - - return (u32) tmp; + return div_u64(ifhz * 16777216ull, + (xtal == SONY_XTAL_24000) ? 48000000 : 41000000); } static u32 cxd2841er_calc_iffreq(u32 ifhz) -- 2.39.5
