basic: delete loadavg.h copy

loadavg.h is an internal header of the Linux source repository, and as
such it is licensed as GPLv2-only, without syscall exception.

We use it only for 4 macros, which are simply doing some math calculations
that cannot thus be subject to copyright.
Reimplement the same calculations in another internal header and delete
loadavg.h from our tree.

2 files changed, 1 insertions, 53 deletions

diff --git a/src/basic/linux/loadavg.h b/src/basic/linux/loadavg.h
deleted file mode 100644
index 83ec54b65e..0000000000
--- a/src/basic/linux/loadavg.h
+++ /dev/null
@@ -1,48 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_SCHED_LOADAVG_H
-#define _LINUX_SCHED_LOADAVG_H
-
-/*
- * These are the constant used to fake the fixed-point load-average
- * counting. Some notes:
- *  - 11 bit fractions expand to 22 bits by the multiplies: this gives
- *    a load-average precision of 10 bits integer + 11 bits fractional
- *  - if you want to count load-averages more often, you need more
- *    precision, or rounding will get you. With 2-second counting freq,
- *    the EXP_n values would be 1981, 2034 and 2043 if still using only
- *    11 bit fractions.
- */
-extern unsigned long avenrun[];		/* Load averages */
-extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
-
-#define FSHIFT		11		/* nr of bits of precision */
-#define FIXED_1		(1<<FSHIFT)	/* 1.0 as fixed-point */
-#define LOAD_FREQ	(5*HZ+1)	/* 5 sec intervals */
-#define EXP_1		1884		/* 1/exp(5sec/1min) as fixed-point */
-#define EXP_5		2014		/* 1/exp(5sec/5min) */
-#define EXP_15		2037		/* 1/exp(5sec/15min) */
-
-/*
- * a1 = a0 * e + a * (1 - e)
- */
-static inline unsigned long
-calc_load(unsigned long load, unsigned long exp, unsigned long active)
-{
-	unsigned long newload;
-
-	newload = load * exp + active * (FIXED_1 - exp);
-	if (active >= load)
-		newload += FIXED_1-1;
-
-	return newload / FIXED_1;
-}
-
-extern unsigned long calc_load_n(unsigned long load, unsigned long exp,
-				 unsigned long active, unsigned int n);
-
-#define LOAD_INT(x) ((x) >> FSHIFT)
-#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
-
-extern void calc_global_load(void);
-
-#endif /* _LINUX_SCHED_LOADAVG_H */
diff --git a/src/basic/linux/update.sh b/src/basic/linux/update.sh
index 1ada894f09..72e133d0bc 100755
--- a/src/basic/linux/update.sh
+++ b/src/basic/linux/update.sh
@@ -4,11 +4,7 @@ set -eu
 set -o pipefail
 
 for i in *.h */*.h; do
-    if [[ "$i" == "loadavg.h" ]]; then
-        curl --fail "https://raw.githubusercontent.com/torvalds/linux/master/include/linux/sched/$i" -o "$i"
-    else
-        curl --fail "https://raw.githubusercontent.com/torvalds/linux/master/include/uapi/linux/$i" -o "$i"
-    fi
+    curl --fail "https://raw.githubusercontent.com/torvalds/linux/master/include/uapi/linux/$i" -o "$i"
 
     sed -i -e 's/__user //g' -e '/^#include <linux\/compiler.h>/ d' "$i"
 done