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>

13 files changed, 27 insertions, 24 deletions

diff --git a/Documentation/core-api/kernel-api.rst b/Documentation/core-api/kernel-api.rst
index 71f5d2fe39b7..a29c99d13331 100644
--- a/Documentation/core-api/kernel-api.rst
+++ b/Documentation/core-api/kernel-api.rst
@@ -147,10 +147,10 @@ Division Functions
 .. kernel-doc:: include/linux/math64.h
    :internal:
 
-.. kernel-doc:: lib/div64.c
+.. kernel-doc:: lib/math/div64.c
    :functions: div_s64_rem div64_u64_rem div64_u64 div64_s64
 
-.. kernel-doc:: lib/gcd.c
+.. kernel-doc:: lib/math/gcd.c
    :export:
 
 UUID/GUID
diff --git a/lib/Kconfig b/lib/Kconfig
index f323b85ad11c..3577609b61be 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -46,9 +46,6 @@ config HAVE_ARCH_BITREVERSE
           This option enables the use of hardware bit-reversal instructions on
           architectures which support such operations.
 
-config RATIONAL
-        bool
-
 config GENERIC_STRNCPY_FROM_USER
         bool
 
@@ -61,6 +58,8 @@ config GENERIC_NET_UTILS
 config GENERIC_FIND_FIRST_BIT
         bool
 
+source "lib/math/Kconfig"
+
 config NO_GENERIC_PCI_IOPORT_MAP
         bool
 
@@ -531,12 +530,6 @@ config LRU_CACHE
 config CLZ_TAB
         bool
 
-config CORDIC
-        tristate "CORDIC algorithm"
-        help
-          This option provides an implementation of the CORDIC algorithm;
-          calculations are in fixed point. Module will be called cordic.
-
 config DDR
         bool "JEDEC DDR data"
         help
@@ -628,9 +621,6 @@ config SBITMAP
 config PARMAN
         tristate "parman" if COMPILE_TEST
 
-config PRIME_NUMBERS
-        tristate
-
 config STRING_SELFTEST
         tristate "Test string functions"
 
diff --git a/lib/Makefile b/lib/Makefile
index 83d7df2661ff..fb7697031a79 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -30,7 +30,7 @@ endif
 
 lib-y := ctype.o string.o vsprintf.o cmdline.o \
          rbtree.o radix-tree.o timerqueue.o xarray.o \
-         idr.o int_sqrt.o extable.o \
+         idr.o extable.o \
          sha1.o chacha.o irq_regs.o argv_split.o \
          flex_proportions.o ratelimit.o show_mem.o \
          is_single_threaded.o plist.o decompress.o kobject_uevent.o \
@@ -44,11 +44,11 @@ lib-$(CONFIG_SMP) += cpumask.o
 lib-y   += kobject.o klist.o
 obj-y   += lockref.o
 
-obj-y += bcd.o div64.o sort.o parser.o debug_locks.o random32.o \
+obj-y += bcd.o sort.o parser.o debug_locks.o random32.o \
          bust_spinlocks.o kasprintf.o bitmap.o scatterlist.o \
-         gcd.o lcm.o list_sort.o uuid.o iov_iter.o clz_ctz.o \
+         list_sort.o uuid.o iov_iter.o clz_ctz.o \
          bsearch.o find_bit.o llist.o memweight.o kfifo.o \
-         percpu-refcount.o rhashtable.o reciprocal_div.o \
+         percpu-refcount.o rhashtable.o \
          once.o refcount.o usercopy.o errseq.o bucket_locks.o \
          generic-radix-tree.o
 obj-$(CONFIG_STRING_SELFTEST) += test_string.o
@@ -102,6 +102,8 @@ endif
 obj-$(CONFIG_DEBUG_INFO_REDUCED) += debug_info.o
 CFLAGS_debug_info.o += $(call cc-option, -femit-struct-debug-detailed=any)
 
+obj-y += math/
+
 obj-$(CONFIG_GENERIC_IOMAP) += iomap.o
 obj-$(CONFIG_GENERIC_PCI_IOMAP) += pci_iomap.o
 obj-$(CONFIG_HAS_IOMEM) += iomap_copy.o devres.o
@@ -121,7 +123,6 @@ obj-$(CONFIG_DEBUG_OBJECTS) += debugobjects.o
 
 obj-$(CONFIG_BITREVERSE) += bitrev.o
 obj-$(CONFIG_PACKING)   += packing.o
-obj-$(CONFIG_RATIONAL)  += rational.o
 obj-$(CONFIG_CRC_CCITT) += crc-ccitt.o
 obj-$(CONFIG_CRC16)     += crc16.o
 obj-$(CONFIG_CRC_T10DIF)+= crc-t10dif.o
@@ -195,8 +196,6 @@ obj-$(CONFIG_ATOMIC64_SELFTEST) += atomic64_test.o
 
 obj-$(CONFIG_CPU_RMAP) += cpu_rmap.o
 
-obj-$(CONFIG_CORDIC) += cordic.o
-
 obj-$(CONFIG_DQL) += dynamic_queue_limits.o
 
 obj-$(CONFIG_GLOB) += glob.o
@@ -238,8 +237,6 @@ obj-$(CONFIG_ASN1) += asn1_decoder.o
 
 obj-$(CONFIG_FONT_SUPPORT) += fonts/
 
-obj-$(CONFIG_PRIME_NUMBERS) += prime_numbers.o
-
 hostprogs-y     := gen_crc32table
 hostprogs-y     += gen_crc64table
 clean-files     := crc32table.h
diff --git a/lib/math/Kconfig b/lib/math/Kconfig
new file mode 100644
index 000000000000..73bdf37178d1
--- /dev/null
+++ b/lib/math/Kconfig
@@ -0,0 +1,11 @@
+config CORDIC
+        tristate "CORDIC algorithm"
+        help
+          This option provides an implementation of the CORDIC algorithm;
+          calculations are in fixed point. Module will be called cordic.
+
+config PRIME_NUMBERS
+        tristate
+
+config RATIONAL
+        bool
diff --git a/lib/math/Makefile b/lib/math/Makefile
new file mode 100644
index 000000000000..b75878420da6
--- /dev/null
+++ b/lib/math/Makefile
@@ -0,0 +1,5 @@
+obj-y += div64.o gcd.o lcm.o int_sqrt.o reciprocal_div.o
+
+obj-$(CONFIG_CORDIC)            += cordic.o
+obj-$(CONFIG_PRIME_NUMBERS)     += prime_numbers.o
+obj-$(CONFIG_RATIONAL)          += rational.o
diff --git a/lib/cordic.c b/lib/math/cordic.c
index 8ef27c12956f..8ef27c12956f 100644
--- a/lib/cordic.c
+++ b/lib/math/cordic.c
diff --git a/lib/div64.c b/lib/math/div64.c
index ee146bb4c558..368ca7fd0d82 100644
--- a/lib/div64.c
+++ b/lib/math/div64.c
@@ -10,7 +10,7 @@
  * Generic C version of 64bit/32bit division and modulo, with
  * 64bit result and 32bit remainder.
  *
- * The fast case for (n>>32 == 0) is handled inline by do_div(). 
+ * The fast case for (n>>32 == 0) is handled inline by do_div().
  *
  * Code generated for this function might be very inefficient
  * for some CPUs. __div64_32() can be overridden by linking arch-specific
diff --git a/lib/gcd.c b/lib/math/gcd.c
index 7948ab27f0a4..7948ab27f0a4 100644
--- a/lib/gcd.c
+++ b/lib/math/gcd.c
diff --git a/lib/int_sqrt.c b/lib/math/int_sqrt.c
index 30e0f9770f88..30e0f9770f88 100644
--- a/lib/int_sqrt.c
+++ b/lib/math/int_sqrt.c
diff --git a/lib/lcm.c b/lib/math/lcm.c
index 03d7fcb420b5..03d7fcb420b5 100644
--- a/lib/lcm.c
+++ b/lib/math/lcm.c
diff --git a/lib/prime_numbers.c b/lib/math/prime_numbers.c
index 550eec457c2e..550eec457c2e 100644
--- a/lib/prime_numbers.c
+++ b/lib/math/prime_numbers.c
diff --git a/lib/rational.c b/lib/math/rational.c
index ba7443677c90..ba7443677c90 100644
--- a/lib/rational.c
+++ b/lib/math/rational.c
diff --git a/lib/reciprocal_div.c b/lib/math/reciprocal_div.c
index bf043258fa00..bf043258fa00 100644
--- a/lib/reciprocal_div.c
+++ b/lib/math/reciprocal_div.c