const-correctness warnings from gcc -Wwrite-strings?

[Chris Peterson]

I am preparing a patch that would fix some const-correctness warnings
when compiling the kernel with gcc -Wwrite-strings. I am not (yet?)
proposing that the kernel Makefile should use -Wwrite-strings.

String constants are not writable, but without -Wwrite-strings, gcc
pretends string constants have type non-const char[] to support lazy
legacy code. :)

Are these fixes of any interest? The only controversy I see is that
some of the changes affect the function signatures of some ops
structures' function pointers.

chris
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