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>

1 files changed, 0 insertions, 69 deletions

diff --git a/lib/reciprocal_div.c b/lib/reciprocal_div.c
deleted file mode 100644
index bf043258fa00..000000000000
--- a/lib/reciprocal_div.c
+++ /dev/null
@@ -1,69 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/bug.h>
-#include <linux/kernel.h>
-#include <asm/div64.h>
-#include <linux/reciprocal_div.h>
-#include <linux/export.h>
-
-/*
- * For a description of the algorithm please have a look at
- * include/linux/reciprocal_div.h
- */
-
-struct reciprocal_value reciprocal_value(u32 d)
-{
-	struct reciprocal_value R;
-	u64 m;
-	int l;
-
-	l = fls(d - 1);
-	m = ((1ULL << 32) * ((1ULL << l) - d));
-	do_div(m, d);
-	++m;
-	R.m = (u32)m;
-	R.sh1 = min(l, 1);
-	R.sh2 = max(l - 1, 0);
-
-	return R;
-}
-EXPORT_SYMBOL(reciprocal_value);
-
-struct reciprocal_value_adv reciprocal_value_adv(u32 d, u8 prec)
-{
-	struct reciprocal_value_adv R;
-	u32 l, post_shift;
-	u64 mhigh, mlow;
-
-	/* ceil(log2(d)) */
-	l = fls(d - 1);
-	/* NOTE: mlow/mhigh could overflow u64 when l == 32. This case needs to
-	 * be handled before calling "reciprocal_value_adv", please see the
-	 * comment at include/linux/reciprocal_div.h.
-	 */
-	WARN(l == 32,
-	     "ceil(log2(0x%08x)) == 32, %s doesn't support such divisor",
-	     d, __func__);
-	post_shift = l;
-	mlow = 1ULL << (32 + l);
-	do_div(mlow, d);
-	mhigh = (1ULL << (32 + l)) + (1ULL << (32 + l - prec));
-	do_div(mhigh, d);
-
-	for (; post_shift > 0; post_shift--) {
-		u64 lo = mlow >> 1, hi = mhigh >> 1;
-
-		if (lo >= hi)
-			break;
-
-		mlow = lo;
-		mhigh = hi;
-	}
-
-	R.m = (u32)mhigh;
-	R.sh = post_shift;
-	R.exp = l;
-	R.is_wide_m = mhigh > U32_MAX;
-
-	return R;
-}
-EXPORT_SYMBOL(reciprocal_value_adv);