linux-kernel - Re: [git pull] kgdb light, v5

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Date:	Sun, 10 Feb 2008 09:30:01 -0800
From:	"Ray Lee" <ray-lk@...rabbit.org>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Sam Ravnborg" <sam@...nborg.org>, linux-kernel@...r.kernel.org,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Andrew Morton" <akpm@....com.au>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Jason Wessel" <jason.wessel@...driver.com>
Subject: Re: [git pull] kgdb light, v5

On Feb 10, 2008 8:36 AM, Ingo Molnar <mingo@...e.hu> wrote:
> +#ifdef CONFIG_64BIT
> +       } else if ((count == 8) && (((long)mem & 7) == 0)) {
> +               u64 tmp_ll;
> +               if (probe_kernel_address(mem, tmp_ll))
> +                       return ERR_PTR(-EINVAL);
> +
> +               mem += 8;
> +#ifdef __BIG_ENDIAN
> +               *buf++ = hexchars[(tmp_ll >> 60) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 56) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 52) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 48) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 44) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 40) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 36) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 32) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 28) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 24) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 20) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 16) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 12) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 8) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 4) & 0xf];
> +               *buf++ = hexchars[tmp_ll & 0xf];
> +#else
> +               *buf++ = hexchars[(tmp_ll >> 4) & 0xf];
> +               *buf++ = hexchars[tmp_ll & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 12) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 8) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 20) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 16) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 28) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 24) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 36) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 32) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 44) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 40) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 52) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 48) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 60) & 0xf];
> +               *buf++ = hexchars[(tmp_ll >> 56) & 0xf];
> +#endif

Am I missing something? (I'm due, so it's not really a rhetorical
question :-) .) Wouldn't

unsigned int void u64_to_hex(u64 val, unsigned char *buf)
{
         int i;
         for (i=15; i>=0; i--) {
                  buf[i] = hexchars[ val & 0x0f ];
                  val >>= 4;
         }
         return 16;
}
...
         buf += u64_to_hex(cpu_to_be64(tmp_ll), buf);

be clearer both visually, and code-as-intent? (And equivalent helpers
for u32, u16 -- though they could all be rolled into one.)
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