On October 16, 2016 4:07:58 AM PDT, Masahiro Yamada <yamada.masah...@socionext.com> wrote: >The use of config_enabled() is ambiguous. For config options, >IS_ENABLED(), IS_REACHABLE(), etc. will make intention clearer. >Sometimes config_enabled() has been used for non-config options >because it is useful to check whether the given symbol is defined >or not. > >I have been tackling on deprecating config_enabled(), and now is the >time to finish this work. > >Some new users have appeared for v4.9-rc1, but it is trivial to >replace them: > > - arch/x86/mm/kaslr.c > replace config_enabled() with IS_ENABLED() because > CONFIG_X86_ESPFIX64 and CONFIG_EFI are boolean. > > - include/asm-generic/export.h > replace config_enabled() with __is_defined(). > >Then, config_enabled() can be removed now. > >Going forward, please use IS_ENABLED(), IS_REACHABLE(), etc. for >config options, and __is_defined() for non-config symbols. > >Signed-off-by: Masahiro Yamada <yamada.masah...@socionext.com> >--- > > arch/x86/mm/kaslr.c | 6 +++--- > include/asm-generic/export.h | 2 +- > include/linux/kconfig.h | 5 ++--- > 3 files changed, 6 insertions(+), 7 deletions(-) > >diff --git a/arch/x86/mm/kaslr.c b/arch/x86/mm/kaslr.c >index ddd2661..887e571 100644 >--- a/arch/x86/mm/kaslr.c >+++ b/arch/x86/mm/kaslr.c >@@ -104,10 +104,10 @@ void __init kernel_randomize_memory(void) > * consistent with the vaddr_start/vaddr_end variables. > */ > BUILD_BUG_ON(vaddr_start >= vaddr_end); >- BUILD_BUG_ON(config_enabled(CONFIG_X86_ESPFIX64) && >+ BUILD_BUG_ON(IS_ENABLED(CONFIG_X86_ESPFIX64) && > vaddr_end >= EFI_VA_START); >- BUILD_BUG_ON((config_enabled(CONFIG_X86_ESPFIX64) || >- config_enabled(CONFIG_EFI)) && >+ BUILD_BUG_ON((IS_ENABLED(CONFIG_X86_ESPFIX64) || >+ IS_ENABLED(CONFIG_EFI)) && > vaddr_end >= __START_KERNEL_map); > BUILD_BUG_ON(vaddr_end > __START_KERNEL_map); > >diff --git a/include/asm-generic/export.h >b/include/asm-generic/export.h >index 43199a0..63554e9 100644 >--- a/include/asm-generic/export.h >+++ b/include/asm-generic/export.h >@@ -70,7 +70,7 @@ > #include <generated/autoksyms.h> > > #define __EXPORT_SYMBOL(sym, val, sec) \ >- __cond_export_sym(sym, val, sec, config_enabled(__KSYM_##sym)) >+ __cond_export_sym(sym, val, sec, __is_defined(__KSYM_##sym)) > #define __cond_export_sym(sym, val, sec, conf) \ > ___cond_export_sym(sym, val, sec, conf) > #define ___cond_export_sym(sym, val, sec, enabled) \ >diff --git a/include/linux/kconfig.h b/include/linux/kconfig.h >index 15ec117..8f2e059 100644 >--- a/include/linux/kconfig.h >+++ b/include/linux/kconfig.h >@@ -31,7 +31,6 @@ >* When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and >when > * the last step cherry picks the 2nd arg, we get a zero. > */ >-#define config_enabled(cfg) ___is_defined(cfg) > #define __is_defined(x) ___is_defined(x) > #define ___is_defined(val) ____is_defined(__ARG_PLACEHOLDER_##val) >#define ____is_defined(arg1_or_junk) __take_second_arg(arg1_or_junk 1, >0) >@@ -41,13 +40,13 @@ > * otherwise. For boolean options, this is equivalent to > * IS_ENABLED(CONFIG_FOO). > */ >-#define IS_BUILTIN(option) config_enabled(option) >+#define IS_BUILTIN(option) __is_defined(option) > > /* > * IS_MODULE(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'm', 0 > * otherwise. > */ >-#define IS_MODULE(option) config_enabled(option##_MODULE) >+#define IS_MODULE(option) __is_defined(option##_MODULE) > > /* > * IS_REACHABLE(CONFIG_FOO) evaluates to 1 if the currently compiled
How is __is_defined() different from defined()? -- Sent from my Android device with K-9 Mail. Please excuse my brevity.
