linux-kernel - Re: [Intel-gfx] [PATCH 3/4] lib/hexdump.c: Replace ascii bool in hex_dump_to

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Message-ID: <929244ed-cc7f-b0f3-b5ac-50e798e83188@linux.intel.com>
Date:   Fri, 12 Apr 2019 15:47:14 +0100
From:   Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
To:     Alastair D'Silva <alastair@....ibm.com>, alastair@...ilva.org
Cc:     linux-fbdev@...r.kernel.org,
        Stanislaw Gruszka <sgruszka@...hat.com>,
        Petr Mladek <pmladek@...e.com>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org, devel@...verdev.osuosl.org,
        linux-scsi@...r.kernel.org, Jassi Brar <jassisinghbrar@...il.com>,
        ath10k@...ts.infradead.org, intel-gfx@...ts.freedesktop.org,
        Jose Abreu <Jose.Abreu@...opsys.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        linux-fsdevel@...r.kernel.org,
        Steven Rostedt <rostedt@...dmis.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        Karsten Keil <isdn@...ux-pingi.de>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        netdev@...r.kernel.org,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [Intel-gfx] [PATCH 3/4] lib/hexdump.c: Replace ascii bool in
 hex_dump_to_buffer with flags


On 10/04/2019 04:17, Alastair D'Silva wrote:
> From: Alastair D'Silva <alastair@...ilva.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@...ilva.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));
>   		drm_printf(m, "[%04zx] %s\n", pos, line);
>   
>   		prev = buf + pos;

i915 code here actually does something I think is more interesting than
HEXDUMP_SUPPRESS_0X**. It replaces any N repeating lines with a single star
marker. For example:

    00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
    *
    00000040 00000001 00000000 00000018 00000002 00000001 00000000 00000018 00000000
    00000060 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000003
    00000080 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
    *
    000000c0 00000002 00000000 00000000 00000000 00000000 00000000 00000000 00000000
    000000e0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
    *

If or when you end up with this feature in your series you can therefore
replace the whole implementation of hexdump in the above file.

Regards,

Tvrtko