summaryrefslogtreecommitdiff
path: root/lib/int_sqrt.c
diff options
context:
space:
mode:
authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2019-05-15 01:43:05 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-05-15 05:52:49 +0300
commit2c64e9cb0b6b858901e9a386860d7d929d1cbaeb (patch)
tree749da0ef8f5d478680a523c877fb0e16fc18409c /lib/int_sqrt.c
parentb5c56e0cdd62979dd538e5363b06be5bdf735a09 (diff)
downloadlinux-2c64e9cb0b6b858901e9a386860d7d929d1cbaeb.tar.xz
lib: Move mathematic helpers to separate folder
For better maintenance and expansion move the mathematic helpers to the separate folder. No functional change intended. Note, the int_sqrt() is not used as a part of lib, so, moved to regular obj. Link: http://lkml.kernel.org/r/20190323172531.80025-1-andriy.shevchenko@linux.intel.com Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Thierry Reding <thierry.reding@gmail.com> Cc: Lee Jones <lee.jones@linaro.org> Cc: Daniel Thompson <daniel.thompson@linaro.org> Cc: Ray Jui <rjui@broadcom.com> [mchehab+samsung@kernel.org: fix broken doc references for div64.c and gcd.c] Link: http://lkml.kernel.org/r/734f49bae5d4052b3c25691dfefad59bea2e5843.1555580999.git.mchehab+samsung@kernel.org Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/int_sqrt.c')
-rw-r--r--lib/int_sqrt.c70
1 files changed, 0 insertions, 70 deletions
diff --git a/lib/int_sqrt.c b/lib/int_sqrt.c
deleted file mode 100644
index 30e0f9770f88..000000000000
--- a/lib/int_sqrt.c
+++ /dev/null
@@ -1,70 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (C) 2013 Davidlohr Bueso <davidlohr.bueso@hp.com>
- *
- * Based on the shift-and-subtract algorithm for computing integer
- * square root from Guy L. Steele.
- */
-
-#include <linux/kernel.h>
-#include <linux/export.h>
-#include <linux/bitops.h>
-
-/**
- * int_sqrt - computes the integer square root
- * @x: integer of which to calculate the sqrt
- *
- * Computes: floor(sqrt(x))
- */
-unsigned long int_sqrt(unsigned long x)
-{
- unsigned long b, m, y = 0;
-
- if (x <= 1)
- return x;
-
- m = 1UL << (__fls(x) & ~1UL);
- while (m != 0) {
- b = y + m;
- y >>= 1;
-
- if (x >= b) {
- x -= b;
- y += m;
- }
- m >>= 2;
- }
-
- return y;
-}
-EXPORT_SYMBOL(int_sqrt);
-
-#if BITS_PER_LONG < 64
-/**
- * int_sqrt64 - strongly typed int_sqrt function when minimum 64 bit input
- * is expected.
- * @x: 64bit integer of which to calculate the sqrt
- */
-u32 int_sqrt64(u64 x)
-{
- u64 b, m, y = 0;
-
- if (x <= ULONG_MAX)
- return int_sqrt((unsigned long) x);
-
- m = 1ULL << ((fls64(x) - 1) & ~1ULL);
- while (m != 0) {
- b = y + m;
- y >>= 1;
-
- if (x >= b) {
- x -= b;
- y += m;
- }
- m >>= 2;
- }
-
- return y;
-}
-EXPORT_SYMBOL(int_sqrt64);
-#endif