[PATCH v7 02/10] module: allow symbol exports to be disabled
ard.biesheuvel at linaro.org
Wed Jan 3 10:55:05 AEDT 2018
On 2 January 2018 at 23:47, Nicolas Pitre <nicolas.pitre at linaro.org> wrote:
> On Tue, 2 Jan 2018, Ard Biesheuvel wrote:
>> To allow existing C code to be incorporated into the decompressor or
>> the UEFI stub, introduce a CPP macro that turns all EXPORT_SYMBOL_xxx
>> declarations into nops, and #define it in places where such exports
>> are undesirable. Note that this gets rid of a rather dodgy redefine
>> of linux/export.h's header guard.
>> --- a/include/linux/export.h
>> +++ b/include/linux/export.h
>> @@ -83,6 +83,15 @@ extern struct module __this_module;
>> #define __EXPORT_SYMBOL(sym, sec) === __KSYM_##sym ===
>> +#elif defined(__DISABLE_EXPORTS)
>> + * Allow symbol exports to be disabled completely so that C code may
>> + * be reused in other execution contexts such as the UEFI stub or the
>> + * decompressor.
>> + */
>> +#define __EXPORT_SYMBOL(sym, sec)
> I think you should rather put this first thing in the #if sequence so to
> override the defined(__KSYM_DEPS__) case too. No need to create build
> dependencies for module symbols that you're going to stub out
> afterwards anyway.
I wasn't sure, so thanks for clearing that up.
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