RE: [PATCH 3/4] lib/hexdump.c: Replace ascii bool in hex_dump_to_buffer with flags
From: Alastair D'Silva
Date: Fri Apr 12 2019 - 19:31:38 EST
> -----Original Message-----
> From: Petr Mladek <pmladek@xxxxxxxx>
> Sent: Saturday, 13 April 2019 12:12 AM
> To: Alastair D'Silva <alastair@xxxxxxxxxxx>
> Cc: alastair@xxxxxxxxxxx; Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>;
Joonas
> Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>; Rodrigo Vivi
> <rodrigo.vivi@xxxxxxxxx>; David Airlie <airlied@xxxxxxxx>; Daniel Vetter
> <daniel@xxxxxxxx>; Karsten Keil <isdn@xxxxxxxxxxxxxx>; Jassi Brar
> <jassisinghbrar@xxxxxxxxx>; Tom Lendacky <thomas.lendacky@xxxxxxx>;
> David S. Miller <davem@xxxxxxxxxxxxx>; Jose Abreu
> <Jose.Abreu@xxxxxxxxxxxx>; Kalle Valo <kvalo@xxxxxxxxxxxxxx>;
> Stanislaw Gruszka <sgruszka@xxxxxxxxxx>; Benson Leung
> <bleung@xxxxxxxxxxxx>; Enric Balletbo i Serra
> <enric.balletbo@xxxxxxxxxxxxx>; James E.J. Bottomley
> <jejb@xxxxxxxxxxxxx>; Martin K. Petersen <martin.petersen@xxxxxxxxxx>;
> Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>; Alexander Viro
> <viro@xxxxxxxxxxxxxxxxxx>; Sergey Senozhatsky
> <sergey.senozhatsky@xxxxxxxxx>; Steven Rostedt <rostedt@xxxxxxxxxxx>;
> Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>; intel-
> gfx@xxxxxxxxxxxxxxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx; netdev@xxxxxxxxxxxxxxx;
> ath10k@xxxxxxxxxxxxxxxxxxx; linux-wireless@xxxxxxxxxxxxxxx; linux-
> scsi@xxxxxxxxxxxxxxx; linux-fbdev@xxxxxxxxxxxxxxx;
> devel@xxxxxxxxxxxxxxxxxxxx; linux-fsdevel@xxxxxxxxxxxxxxx
> 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@xxxxxxxxxxx>
> >
> > 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@xxxxxxxxxxx>
> > ---
> > 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?
> > drm_printf(m, "[%04zx] %s\n", pos, line);
> >
> > prev = buf + pos;
> > diff --git a/include/linux/printk.h b/include/linux/printk.h index
> > c014e5573665..82975853c400 100644
> > --- a/include/linux/printk.h
> > +++ b/include/linux/printk.h
> > @@ -493,7 +493,7 @@ enum {
> >
> > extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
> > int groupsize, char *linebuf, size_t
linebuflen,
> > - bool ascii);
> > + u64 flags);
>
> I wonder how fancy hex_dump could be. IMHO, u32 should be enough.
> The last famous words ;-)
>
> Best Regards,
> Petr
>
>
> ---
> This email has been checked for viruses by AVG.
> https://www.avg.com