Messages in this thread Patch in this message | ![/](/images/icornerl.gif) | | From | Nathan Chancellor <> | Subject | [PATCH] iwlwifi: mvm: Use div_s64 instead of do_div in iwl_mvm_ftm_rtt_smoothing() | Date | Mon, 27 Dec 2021 12:17:57 -0700 |
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When building ARCH=arm allmodconfig:
drivers/net/wireless/intel/iwlwifi/mvm/ftm-initiator.c: In function ‘iwl_mvm_ftm_rtt_smoothing’: ./include/asm-generic/div64.h:222:35: error: comparison of distinct pointer types lacks a cast [-Werror] 222 | (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \ | ^~ drivers/net/wireless/intel/iwlwifi/mvm/ftm-initiator.c:1070:9: note: in expansion of macro ‘do_div’ 1070 | do_div(rtt_avg, 100); | ^~~~~~
do_div() has to be used with an unsigned 64-bit integer dividend but rtt_avg is a signed 64-bit integer.
div_s64() expects a signed 64-bit integer dividend and signed 32-bit divisor, which fits this scenario, so use that function here to fix the warning.
Fixes: 8b0f92549f2c ("iwlwifi: mvm: fix 32-bit build in FTM") Signed-off-by: Nathan Chancellor <nathan@kernel.org> --- drivers/net/wireless/intel/iwlwifi/mvm/ftm-initiator.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/ftm-initiator.c b/drivers/net/wireless/intel/iwlwifi/mvm/ftm-initiator.c index 9449d1af3c11..628aee634b2a 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/ftm-initiator.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/ftm-initiator.c @@ -1066,8 +1066,7 @@ static void iwl_mvm_ftm_rtt_smoothing(struct iwl_mvm *mvm, overshoot = IWL_MVM_FTM_INITIATOR_SMOOTH_OVERSHOOT; alpha = IWL_MVM_FTM_INITIATOR_SMOOTH_ALPHA; - rtt_avg = alpha * rtt + (100 - alpha) * resp->rtt_avg; - do_div(rtt_avg, 100); + rtt_avg = div_s64(alpha * rtt + (100 - alpha) * resp->rtt_avg, 100); IWL_DEBUG_INFO(mvm, "%pM: prev rtt_avg=%lld, new rtt_avg=%lld, rtt=%lld\n", base-commit: bcbddc4f9d020a4a0b881cc065729c3aaeb28098 -- 2.34.1
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