Date: Thu, 11 Oct 2012 15:06:41 +0200 From: Erik Cederstrand <erik@cederstrand.dk> To: FreeBSD Hackers <hackers@FreeBSD.org> Subject: curcpu false positive? Message-ID: <3A22DF7A-00BB-408C-8F76-C1E119E0E48C@cederstrand.dk>
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Hello,
I'm looking at some Clang Static Analyzer reports in the kernel, and a =
lot of them point back to a null pointer dereference in __pcpu_type =
(sys/amd64/include/pcpu.h:102) which is defined as:
102 /*
103 * Evaluates to the type of the per-cpu variable name.
104 */
105 #define __pcpu_type(name) =
\
106 __typeof(((struct pcpu *)0)->name)
Which indeed looks like a NULL pointer dereference. Looking at the =
latest commit message there, I'm sure the code is correct, but I'm =
unsure why the null pointer is OK. I'd appreciate an explanation :-)
Thanks,
Erik=
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