Quoting Jaswinder Singh <jaswinder@xxxxxxxxxxxxx>:
Hello all,
I am trying to solve sparse warnings in kernel.
Please let me know how can I solve following sparse warning :-
warning: cast adds address space to expression
Is this a warning or a Info.
It's a warning. The code must be doing something like this:
void *addr1;
void __iomem *addr2;
addr2 = (void __iomem *) addr1;
If any sparse documentation is available, please let me know.
I don't think you need sparse documentation to resolve it. Sparse
only detected a bad cast, but fixing it requires deeper understanding
of the code, not of the warning.
You should look at the expression and see if the value before cast
needs the attribute, or the value after the cast doesn't need the
attribute.
The meanings of attributes in Linux are:
__user - pointer to data that came from the userspace
__iomem - pointer to a device I/O area (ports or I/O memory)
There are functions that deal with such pointers. The code you are
dealing with may be trying to circumvent those functions.
Further questions are better asked in Linux specific lists with more
details of the code. Please note that you should understand the code
to fix it. Just fixing the warning without understanding the problem
is defeating the whole purpose of sparse.
--
Regards,
Pavel Roskin
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