linux-kernel - [Question] What is the main function of sym_calc

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Date:   Wed, 28 Aug 2019 17:12:23 +0800 (CST)
From:   宋 <csqshz@....com>
To:     linux-kernel@...r.kernel.org
Subject: [Question] What is the main function of sym_calc_value() under
 scripts/kconfig/symbol.c


Hi,


When "make KCONFIG_ALLCONFIG= mytmp.config alldefconfig", I find sym_calc_value() under scripts/kconfig/symbol.c is called many times.


But I don't understand what does sym_calc_value() do.


make KCONFIG_ALLCONFIG= mytmp.config alldefconfig
-> scripts/kconfig/conf.c main()
-> switch case alldefconfig
-> conf_write()
-> sym_calc_value()
sym_calc_value() is also called in many other place.


Can you tell me the function of sym_calc_value() ?


main(): https://github.com/torvalds/linux/blob/9e8312f5e160ade069e131d54ab8652cf0e86e1a/scripts/kconfig/conf.c#L486


sym_calc_value(): https://github.com/torvalds/linux/blob/9e8312f5e160ade069e131d54ab8652cf0e86e1a/scripts/kconfig/symbol.c#L319 


BestRegard,
-- Csqshz