Re: [PATCH 3/4] lib/hexdump.c: Replace ascii bool in hex_dump_to_buffer with flags

[Petr Mladek <pmladek@suse.com>]

On Sat 2019-04-13 09:31:27, Alastair D'Silva wrote:
> > -----Original Message-----
> > From: Petr Mladek <pmladek@suse.com>
> > Sent: Saturday, 13 April 2019 12:12 AM
> > To: Alastair D'Silva <alastair@au1.ibm.com>
> > Cc: alastair@d-silva.org; Jani Nikula <jani.nikula@linux.intel.com>;
> Joonas
> > Lahtinen <joonas.lahtinen@linux.intel.com>; Rodrigo Vivi
> > <rodrigo.vivi@intel.com>; David Airlie <airlied@linux.ie>; Daniel Vetter
> > <daniel@ffwll.ch>; Karsten Keil <isdn@linux-pingi.de>; Jassi Brar
> > <jassisinghbrar@gmail.com>; Tom Lendacky <thomas.lendacky@amd.com>;
> > David S. Miller <davem@davemloft.net>; Jose Abreu
> > <Jose.Abreu@synopsys.com>; Kalle Valo <kvalo@codeaurora.org>;
> > Stanislaw Gruszka <sgruszka@redhat.com>; Benson Leung
> > <bleung@chromium.org>; Enric Balletbo i Serra
> > <enric.balletbo@collabora.com>; James E.J. Bottomley
> > <jejb@linux.ibm.com>; Martin K. Petersen <martin.petersen@oracle.com>;
> > Greg Kroah-Hartman <gregkh@linuxfoundation.org>; Alexander Viro
> > <viro@zeniv.linux.org.uk>; Sergey Senozhatsky
> > <sergey.senozhatsky@gmail.com>; Steven Rostedt <rostedt@goodmis.org>;
> > Andrew Morton <akpm@linux-foundation.org>; intel-
> > gfx@lists.freedesktop.org; dri-devel@lists.freedesktop.org; linux-
> > kernel@vger.kernel.org; netdev@vger.kernel.org;
> > ath10k@lists.infradead.org; linux-wireless@vger.kernel.org; linux-
> > scsi@vger.kernel.org; linux-fbdev@vger.kernel.org;
> > devel@driverdev.osuosl.org; linux-fsdevel@vger.kernel.org
> > Subject: Re: [PATCH 3/4] lib/hexdump.c: Replace ascii bool in
> > hex_dump_to_buffer with flags
> > 
> > On Wed 2019-04-10 13:17:19, Alastair D'Silva wrote:
> > > From: Alastair D'Silva <alastair@d-silva.org>
> > >
> > > In order to support additional features in hex_dump_to_buffer, replace
> > > the ascii bool parameter with flags.
> > >
> > > Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
> > > ---
> > >  drivers/gpu/drm/i915/intel_engine_cs.c            |  2 +-
> > >  drivers/isdn/hardware/mISDN/mISDNisar.c           |  6 ++++--
> > >  drivers/mailbox/mailbox-test.c                    |  2 +-
> > >  drivers/net/ethernet/amd/xgbe/xgbe-drv.c          |  2 +-
> > >  drivers/net/ethernet/synopsys/dwc-xlgmac-common.c |  2 +-
> > >  drivers/net/wireless/ath/ath10k/debug.c           |  3 ++-
> > >  drivers/net/wireless/intel/iwlegacy/3945-mac.c    |  2 +-
> > >  drivers/platform/chrome/wilco_ec/debugfs.c        |  3 ++-
> > >  drivers/scsi/scsi_logging.c                       |  8 +++-----
> > >  drivers/staging/fbtft/fbtft-core.c                |  2 +-
> > >  fs/seq_file.c                                     |  3 ++-
> > >  include/linux/printk.h                            |  2 +-
> > >  lib/hexdump.c                                     | 15 ++++++++-------
> > >  lib/test_hexdump.c                                |  5 +++--
> > >  14 files changed, 31 insertions(+), 26 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c
> > > b/drivers/gpu/drm/i915/intel_engine_cs.c
> > > index 49fa43ff02ba..fb133e729f9a 100644
> > > --- a/drivers/gpu/drm/i915/intel_engine_cs.c
> > > +++ b/drivers/gpu/drm/i915/intel_engine_cs.c
> > > @@ -1318,7 +1318,7 @@ static void hexdump(struct drm_printer *m, const
> > void *buf, size_t len)
> > >  		WARN_ON_ONCE(hex_dump_to_buffer(buf + pos, len -
> > pos,
> > >  						rowsize, sizeof(u32),
> > >  						line, sizeof(line),
> > > -						false) >= sizeof(line));
> > > +						0) >= sizeof(line));
> > 
> > It might be more clear when we define:
> > 
> > #define HEXDUMP_BINARY 0
> 
> This feels unnecessary, and weird. Omitting the flag won't disable the hex
> output (as expected), and if you don't want hex output why call hexdump in
> the first place?

Why do we have HEXDUMP_ASCII then?
Why is the above funtion not using HEXDUMP_ASCII?
Who would call it with (HEXDUMP_ASCII | HEXDUMP_BINARY)?

Best Regards,
Petr