tree-wide: replace config_enabled() with IS_ENABLED()

The use of config_enabled() against config options is ambiguous.  In
practical terms, config_enabled() is equivalent to IS_BUILTIN(), but the
author might have used it for the meaning of IS_ENABLED().  Using
IS_ENABLED(), IS_BUILTIN(), IS_MODULE() etc.  makes the intention
clearer.

This commit replaces config_enabled() with IS_ENABLED() where possible.
This commit is only touching bool config options.

I noticed two cases where config_enabled() is used against a tristate
option:

 - config_enabled(CONFIG_HWMON)
  [ drivers/net/wireless/ath/ath10k/thermal.c ]

 - config_enabled(CONFIG_BACKLIGHT_CLASS_DEVICE)
  [ drivers/gpu/drm/gma500/opregion.c ]

I did not touch them because they should be converted to IS_BUILTIN()
in order to keep the logic, but I was not sure it was the authors'
intention.

Link: http://lkml.kernel.org/r/1465215656-20569-1-git-send-email-yamada.masahiro@socionext.com
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Stas Sergeev <stsp@list.ru>
Cc: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: Joshua Kinard <kumba@gentoo.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: "Dmitry V. Levin" <ldv@altlinux.org>
Cc: yu-cheng yu <yu-cheng.yu@intel.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Will Drewry <wad@chromium.org>
Cc: Nikolay Martynov <mar.kolya@gmail.com>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Cc: Rafal Milecki <zajec5@gmail.com>
Cc: James Cowgill <James.Cowgill@imgtec.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Alex Smith <alex.smith@imgtec.com>
Cc: Adam Buchbinder <adam.buchbinder@gmail.com>
Cc: Qais Yousef <qais.yousef@imgtec.com>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Mikko Rapeli <mikko.rapeli@iki.fi>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Brian Norris <computersforpeace@gmail.com>
Cc: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>
Cc: "Luis R. Rodriguez" <mcgrof@do-not-panic.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Roland McGrath <roland@hack.frob.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Kalle Valo <kvalo@qca.qualcomm.com>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Tony Wu <tung7970@gmail.com>
Cc: Huaitong Han <huaitong.han@intel.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Juergen Gross <jgross@suse.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Andrea Gelmini <andrea.gelmini@gelma.net>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Rabin Vincent <rabin@rab.in>
Cc: "Maciej W. Rozycki" <macro@imgtec.com>
Cc: David Daney <david.daney@cavium.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/mips/include/asm/pgtable.h

@@ -159,7 +159,7 @@ static inline void set_pte(pte_t *ptep, pte_t pte)
 		 * it better already be global)
 		 */
 		if (pte_none(*buddy)) {
-			if (!config_enabled(CONFIG_XPA))
+			if (!IS_ENABLED(CONFIG_XPA))
 				buddy->pte_low |= _PAGE_GLOBAL;
 			buddy->pte_high |= _PAGE_GLOBAL;
 		}
@@ -172,7 +172,7 @@ static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *pt
 
 	htw_stop();
 	/* Preserve global status for the pair */
-	if (config_enabled(CONFIG_XPA)) {
+	if (IS_ENABLED(CONFIG_XPA)) {
 		if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL)
 			null.pte_high = _PAGE_GLOBAL;
 	} else {
@@ -319,7 +319,7 @@ static inline int pte_young(pte_t pte)	{ return pte.pte_low & _PAGE_ACCESSED; }
 static inline pte_t pte_wrprotect(pte_t pte)
 {
 	pte.pte_low  &= ~_PAGE_WRITE;
-	if (!config_enabled(CONFIG_XPA))
+	if (!IS_ENABLED(CONFIG_XPA))
 		pte.pte_low &= ~_PAGE_SILENT_WRITE;
 	pte.pte_high &= ~_PAGE_SILENT_WRITE;
 	return pte;
@@ -328,7 +328,7 @@ static inline pte_t pte_wrprotect(pte_t pte)
 static inline pte_t pte_mkclean(pte_t pte)
 {
 	pte.pte_low  &= ~_PAGE_MODIFIED;
-	if (!config_enabled(CONFIG_XPA))
+	if (!IS_ENABLED(CONFIG_XPA))
 		pte.pte_low &= ~_PAGE_SILENT_WRITE;
 	pte.pte_high &= ~_PAGE_SILENT_WRITE;
 	return pte;
@@ -337,7 +337,7 @@ static inline pte_t pte_mkclean(pte_t pte)
 static inline pte_t pte_mkold(pte_t pte)
 {
 	pte.pte_low  &= ~_PAGE_ACCESSED;
-	if (!config_enabled(CONFIG_XPA))
+	if (!IS_ENABLED(CONFIG_XPA))
 		pte.pte_low &= ~_PAGE_SILENT_READ;
 	pte.pte_high &= ~_PAGE_SILENT_READ;
 	return pte;
@@ -347,7 +347,7 @@ static inline pte_t pte_mkwrite(pte_t pte)
 {
 	pte.pte_low |= _PAGE_WRITE;
 	if (pte.pte_low & _PAGE_MODIFIED) {
-		if (!config_enabled(CONFIG_XPA))
+		if (!IS_ENABLED(CONFIG_XPA))
 			pte.pte_low |= _PAGE_SILENT_WRITE;
 		pte.pte_high |= _PAGE_SILENT_WRITE;
 	}
@@ -358,7 +358,7 @@ static inline pte_t pte_mkdirty(pte_t pte)
 {
 	pte.pte_low |= _PAGE_MODIFIED;
 	if (pte.pte_low & _PAGE_WRITE) {
-		if (!config_enabled(CONFIG_XPA))
+		if (!IS_ENABLED(CONFIG_XPA))
 			pte.pte_low |= _PAGE_SILENT_WRITE;
 		pte.pte_high |= _PAGE_SILENT_WRITE;
 	}
@@ -369,7 +369,7 @@ static inline pte_t pte_mkyoung(pte_t pte)
 {
 	pte.pte_low |= _PAGE_ACCESSED;
 	if (!(pte.pte_low & _PAGE_NO_READ)) {
-		if (!config_enabled(CONFIG_XPA))
+		if (!IS_ENABLED(CONFIG_XPA))
 			pte.pte_low |= _PAGE_SILENT_READ;
 		pte.pte_high |= _PAGE_SILENT_READ;
 	}