unable to find function definition

[Valdis.Kletnieks at vt.edu]

On Tue, 26 Apr 2016 15:31:51 +0200, Silvan Jegen said:

> A simple but naive approach would be a grep command like this.
>
> grep "function_pointer =" `find . -iname '*.c' -o -iname '*.h'`

Two better ways:

grep -r "function_pointer =' [A-Za-z]*

find * -name '*.[ch]' | xargs grep 'function pointer ='

Hint 1:  Globbing * rather than . is a win at the top level of the
kernel source, because * won't match .git, which is a gigabyte or so
of stuff that you don't want to grep through

Hint 2: You want -name rather than -iname because there shouldn't be any
*.C or *.H files in the tree, and avoiding case-insensitive matches is a bit
faster.

And another winner if you have a git tree (which of course you should):

git grep 'function_pointer ='

One gotcha is that in some places, the kernel does evil pre-processor
stuff like:

#define ATOMIC_LONG_INIT(i)     ATOMIC_INIT(i)
#define ATOMIC_LONG_PFX(x)      atomic ## x

#endif

#define ATOMIC_LONG_READ_OP(mo)                                         static inline long atomic_long_read##mo(const atomic_long_t *l)         {                                                                               ATOMIC_LONG_PFX(_t) *v = (ATOMIC_LONG_PFX(_t) *)l;                                                                                              return (long)ATOMIC_LONG_PFX(_read##mo)(v);                     }
ATOMIC_LONG_READ_OP()
ATOMIC_LONG_READ_OP(_acquire)

(this example from include/asm-generic/atomic-long.h, but similar ## abuse
happens elsewhere as well...)
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