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SubjectRe: Add sparse "__iomem" infrastructure to check PCI address usage

While resuming adding __user annotations to the m68k-specific parts of the
code, I stumbled on

struct task_struct {
unsigned long sas_ss_sp;

If I'm not mistaken, sas_ss_sp is always a pointer to user stack space.
Shouldn't it be changed to `void __user *sas_ss_sp', or is an
unsigned long/void * change in generic code a too controversial change for
making sparse happy?

And I guess I can find a few more of these...



Geert Uytterhoeven -- There's lots of Linux beyond ia32 --

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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