Hi,
ninjaboy <n0b0dyn1nj4@xxxxxxxxx> writes:
> 2008/7/18 Robert P. J. Day <rpjday@xxxxxxxxxxxxxx>:
>>
>> from <linux/compiler.h>:
>>
>> extern void __chk_user_ptr(const volatile void __user *);
>> extern void __chk_io_ptr(const volatile void __iomem *);
>>
>> ok, so ... where are those routines defined? i've grep'ped and i
>> don't see the definitions. am i missing something?
>
> They are not defined, this is a trick to take an error at compile
> time, where there is probably an if(sizeof(something) > {1,2,4,8}).
This is not a linker-trap.
I have this in include/linux/compiler.h:
#ifdef __CHECKER__
[...]
extern void __chk_user_ptr(const volatile void __user *);
extern void __chk_io_ptr(const volatile void __iomem *);
[...]
#else
[...]
# define __chk_user_ptr(x) (void)0
# define __chk_io_ptr(x) (void)0
[...]
#endif
If sparse sees this, it will check the argument types. In normal
compile runs, this will just be thrown out.
Hannes, wild guessing
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