On Tue, 2011-10-25 at 20:01 -0400, Mike Frysinger wrote:
> On Sun, Oct 23, 2011 at 06:19, Jonas Bonn <jonas@xxxxxxxxxxxx> wrote:
> > --- a/arch/blackfin/include/asm/syscall.h
> > +++ b/arch/blackfin/include/asm/syscall.h
> >
> > static inline long
> > syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
> > {
> > - return regs->p0;
> > + return regs->orig_p0;
> > }
>
> i'm not sure this is correct. we set the orig_p0 to -1 when forcing
> the syscall to go to restart. shouldn't syscall_get_nr() still return
> the right value ?
No, syscall_get_nr is only valid while processing a syscall (should
return -1 otherwise) and the syscall processing is effectively finished
once you've handled the restart requirements so returning -1 at that
point makes sense... patch 1/8 relies on that fact.
>
> > syscall_set_return_value(struct task_struct *task, struct pt_regs *regs,
> > int error, long val)
> > {
> > - regs->r0 = error ? -error : val;
> > + regs->r0 = error ? error : val;
> > }
>
> this fix is unrelated (and unmentioned in the changelog). i also see
> a bunch of other arches doing this. so we should pull this change out
> into a dedicated patchset, and fix all the arches at the same time.
Agreed, this should go into a separate patch. It's true that some
arches do the negation as above, but those arch's return positive error
numbers and indicate syscall error by setting a separate flag. I'll
prepare a separate patch for this.
/Jonas
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