From 4685f980e24686a6b498602419a92c1d54478258 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Thu, 30 Apr 2020 22:18:47 -0600
Subject: compat: use bash instead of bc for HZ-->USEC calculation

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
 src/compat/Kbuild.include | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

(limited to 'src/compat/Kbuild.include')

diff --git a/src/compat/Kbuild.include b/src/compat/Kbuild.include
index db20bd5..e937671 100644
--- a/src/compat/Kbuild.include
+++ b/src/compat/Kbuild.include
@@ -53,11 +53,7 @@ endif
 
 ifdef CONFIG_HZ
 ifeq ($(wildcard $(CURDIR)/include/generated/timeconst.h),)
-HZ_IFDEF := $(shell echo 'define gcd(a,b){auto t;while(b){t=b;b=a%b;a=t;};return a;};hz=$(CONFIG_HZ);cd=gcd(hz,1000000);print "-DHZ_TO_USEC_NUM=",1000000/cd," -DHZ_TO_USEC_DEN=",hz/cd;halt;' | bc -q)
-ifeq ($(HZ_IFDEF),)
-$(error bc(1) is required for building)
-endif
-ccflags-y += $(HZ_IFDEF)
+ccflags-y += $(shell bash -c '((a=$(CONFIG_HZ), b=1000000)); while ((b > 0)); do ((t=b, b=a%b, a=t)); done; echo "-DHZ_TO_USEC_NUM=$$((1000000/a)) -DHZ_TO_USEC_DEN=$$(($(CONFIG_HZ)/a))";')
 endif
 endif
 
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