Hello,
I'm porting a kernel module (originally x86) to an OpenWRT
environment (MIPS) running a 2.4 kernel. The module has multiple files.
In foo.h, there is:
--
extern kmem_cache_t *my_cache;
--
then in foo.c (includes foo.h), there is:
--
kmem_cache_t *my_cache;
--
When I loaded the module for the first time I got a segfault, which I
traced to one of the first few lines of the init function:
--
my_cache = kmem_cache_create(...);
--
I spent a lot of time tearing my hair out trying to figure out why
kmem_cache_create was segfaulting before realizing that I got the
same behavior just setting my_cache to any value. I then discovered
that if I declare my_cache as static, the problem goes away (this
doesn't work for the module as a whole, since many files in the
module want to access my_cache).
I'm guessing I need some special linkage macro in front of the
declaration, but I can't seem to find out what on google (or could it
be that I'm compiling it wrong?). The weird thing is that I'm pretty
sure this code was working on x86. Can someone shed some light on how
I should proceed?
Thanks,
-Bobby Holley
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