lib: polynomial: move to math/ subfolder

Patch series "lib: polynomial: Move to math/ and clean up", v2.

While removing Baikal SoC and platform code pieces I found that this code
belongs to lib/math/ rather than generic lib/.  Hence the move and
followed up cleanups.


This patch (of 3):

The algorithm behind polynomial belongs to our collection of math
equations and expressions handling.  Move it to math/ subfolder where
others of the kind are located.

Link: https://lkml.kernel.org/r/20260302092831.2267785-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

lib/Kconfig

@@ -625,9 +625,6 @@ config PLDMFW
 config ASN1_ENCODER
        tristate
 
-config POLYNOMIAL
-       tristate
-
 config FIRMWARE_TABLE
 	bool
 

lib/Makefile

@@ -243,8 +243,6 @@ obj-$(CONFIG_MEMREGION) += memregion.o
 obj-$(CONFIG_STMP_DEVICE) += stmp_device.o
 obj-$(CONFIG_IRQ_POLL) += irq_poll.o
 
-obj-$(CONFIG_POLYNOMIAL) += polynomial.o
-
 # stackdepot.c should not be instrumented or call instrumented functions.
 # Prevent the compiler from calling builtins like memcmp() or bcmp() from this
 # file.

lib/math/Kconfig

@@ -5,6 +5,9 @@ config CORDIC
 	  This option provides an implementation of the CORDIC algorithm;
 	  calculations are in fixed point. Module will be called cordic.
 
+config POLYNOMIAL
+       tristate
+
 config PRIME_NUMBERS
 	tristate "Simple prime number generator for testing"
 	help

lib/math/Makefile

@@ -2,6 +2,7 @@
 obj-y += div64.o gcd.o lcm.o int_log.o int_pow.o int_sqrt.o reciprocal_div.o
 
 obj-$(CONFIG_CORDIC)		+= cordic.o
+obj-$(CONFIG_POLYNOMIAL)	+= polynomial.o
 obj-$(CONFIG_PRIME_NUMBERS)	+= prime_numbers.o
 obj-$(CONFIG_RATIONAL)		+= rational.o