On Wed, 2015-04-08 at 09:40 +0000, David Laight wrote:
> From: yanjiang....@windriver.com
> > Sent: 03 April 2015 10:18
> > From: Yanjiang Jin <yanjiang....@windriver.com>
> >
> > do_div() expects the type of "n" to be uint64_t, define "lat_ns" as u64 to
> > avoid the below warning, also update its correlative operations and data.
> >
> > In file included from ./arch/powerpc/include/asm/div64.h:1:0,
> > from include/linux/kernel.h:124,
> > from include/linux/list.h:8,
> > from include/linux/timer.h:4,
> > from drivers/net/ethernet/intel/e1000e/e1000.h:29,
> > from drivers/net/ethernet/intel/e1000e/ich8lan.c:59:
> > drivers/net/ethernet/intel/e1000e/ich8lan.c: In function
> > 'e1000_platform_pm_pch_lpt':
> > include/asm-generic/div64.h:43:28: warning: comparison of distinct pointer
> > types lacks a cast [enabled
> > by default]
> > (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \
> > ^
> > drivers/net/ethernet/intel/e1000e/ich8lan.c:1016:4: note: in expansion of
> > macro 'do_div'
> > do_div(lat_ns, speed);
> >
> > Signed-off-by: Yanjiang Jin <yanjiang....@windriver.com>
> > ---
> > drivers/net/ethernet/intel/e1000e/ich8lan.c | 8 ++++----
> > 1 file changed, 4 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/intel/e1000e/ich8lan.c
> > b/drivers/net/ethernet/intel/e1000e/ich8lan.c
> > index 48b74a5..baab58b 100644
> > --- a/drivers/net/ethernet/intel/e1000e/ich8lan.c
> > +++ b/drivers/net/ethernet/intel/e1000e/ich8lan.c
> > @@ -982,8 +982,8 @@ static s32 e1000_platform_pm_pch_lpt(struct e1000_hw
> > *hw, bool link)
> > u16 speed, duplex, scale = 0;
> > u16 max_snoop, max_nosnoop;
> > u16 max_ltr_enc; /* max LTR latency encoded */
> > - s64 lat_ns; /* latency (ns) */
> > - s64 value;
> > + u64 lat_ns; /* latency (ns) */
> > + u64 value;
> > u32 rxa;
> >
> > if (!hw->adapter->max_frame_size) {
> > @@ -1008,8 +1008,8 @@ static s32 e1000_platform_pm_pch_lpt(struct e1000_hw
> > *hw, bool link)
> > * 2^25*(2^10-1) ns. The scale is encoded as 0=2^0ns,
> > * 1=2^5ns, 2=2^10ns,...5=2^25ns.
> > */
> > - lat_ns = ((s64)rxa * 1024 -
> > - (2 * (s64)hw->adapter->max_frame_size)) * 8 * 1000;
> > + lat_ns = ((u64)rxa * 1024 -
> > + (2 * (u64)hw->adapter->max_frame_size)) * 8 * 1000;
> > if (lat_ns < 0)
> > lat_ns = 0;
>
> The above change cannot be correct.
> You should be getting another error for testing an unsigned value be less
> than 0.
>
> So I presume this wasn't even tested.
> I found the same issue and I am putting together another patch to resolve the issue that Yanjiang saw.
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