can't find <asm/system.h>

[Valdis.Kletnieks at vt.edu]

On Tue, 03 Jun 2014 14:23:22 +0800, "jinzhao at wingtech.com" said:
> In my code, I include the file <asm/system.h>, but when compiling the code,
> show the error as "can't find the file or directory asm/system.h". Why??

Probably because either:

1) Your Makefile isn't set up to use the Kbuild architecture, which should
take care of all that for you when building an out-of-tree module.
or
2) You haven't properly set up a kernel source tree to build against.
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