[U-Boot] [PATCH 7/7] GCC4.6: Squash warning in cmd_mem.c

[Marek Vasut <marek.vasut@gmail.com>]

On Monday, September 26, 2011 08:05:43 PM Simon Glass wrote:
> Hi Marek,
> 
> On Sun, Sep 25, 2011 at 5:26 PM, Marek Vasut <marek.vasut@gmail.com> wrote:
> > cmd_mem.c: In function ?do_mem_loop?:
> > cmd_mem.c:474:25: warning: variable ?junk? set but not used
> > [-Wunused-but-set-variable]
> > 
> > The assigned variable can be removed because the pointers are volatile so
> > accesses to their addresses are always generated.
> > 
> > Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
> > ---
> >  common/cmd_mem.c |    8 ++++----
> >  1 files changed, 4 insertions(+), 4 deletions(-)
> > 
> > diff --git a/common/cmd_mem.c b/common/cmd_mem.c
> > index 4daa1b3..e84cc4e 100644
> > --- a/common/cmd_mem.c
> > +++ b/common/cmd_mem.c
> > @@ -471,7 +471,7 @@ int do_mem_base (cmd_tbl_t *cmdtp, int flag, int
> > argc, char * const argv[])
> > 
> >  int do_mem_loop (cmd_tbl_t *cmdtp, int flag, int argc, char * const
> > argv[]) {
> > -       ulong   addr, length, i, junk;
> > +       ulong   addr, length, i;
> >        int     size;
> >        volatile uint   *longp;
> >        volatile ushort *shortp;
> > @@ -518,7 +518,7 @@ int do_mem_loop (cmd_tbl_t *cmdtp, int flag, int
> > argc, char * const argv[]) longp = (uint *)addr;
> >                        i = length;
> >                        while (i-- > 0)
> > -                               junk = *longp++;
> > +                               *longp++;
> >                }
> >        }
> >        if (size == 2) {
> > @@ -526,14 +526,14 @@ int do_mem_loop (cmd_tbl_t *cmdtp, int flag, int
> > argc, char * const argv[]) shortp = (ushort *)addr;
> >                        i = length;
> >                        while (i-- > 0)
> > -                               junk = *shortp++;
> > +                               *shortp++;
> >                }
> >        }
> >        for (;;) {
> >                cp = (u_char *)addr;
> >                i = length;
> >                while (i-- > 0)
> > -                       junk = *cp++;
> > +                       *cp++;
> >        }
> >  }
> 
> I checked the ARM assembler output and it looks fine.
> 
> Acked-by: Simon Glass <sjg@chromium.org>
> 
> Re the 'length == 1' case (above your patch) site, it is assigning to
> 'i' here. Could/should we remove that assignment also?

The loop below depends on that ... ?

> 
> Regards,
> Simon
> 
> > --
> > 1.7.5.4
> > 
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