[PATCH] staging: gdm724x: gdm_tty: corrected macro by adding brackets
gregkh at linuxfoundation.org
Tue Sep 1 11:08:38 UTC 2020
On Tue, Sep 01, 2020 at 12:43:11PM +0200, antoniprzybylik wrote:
> Such macros are dangerous. Consider following example:
> #define GDM_TTY_READY(gdm) (gdm && gdm->tty_dev && gdm->port.count)
> GDM_TTY_READY(a + b)
> This macro will be expanded in such a way:
> (a + b && a + b->tty_dev && a + b->port.count)
> And it will lead to errors.
This is for a pointer, no one would ever do that :)
But, if you really worry about this, turn it into an inline function,
that way you get the proper typedef safety, which is what something like
this should really be, not a macro.
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