Andrew Morton wrote:
> #define AUDIT_FIRST_USER_MSG 1100 /* Userspace messages mostly uninteresting to kernel */
> #define AUDIT_USER_AVC 1107 /* We filter this differently */
> #define AUDIT_LAST_USER_MSG 1199
>
> and CPP turns that into
>
> case 1100 ...1199:
> case 2100 ...2999:
>
> and it does the same when the comments are stripped from the #defines.
>
> So we were saved by the trailing space which cpp added to the expanded
> macro. I wonder why cpp did that, and to what extent one can rely cpp
> doing that.
I think its required to. If it didn't, it would be effectively pasting
two tokens together without the ## operator. But putting spaces in is
safer - or putting () around the numbers.
J
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