linux-kernel - Re: [PATCH 1/1] Staging: zram: print the disk size in KB

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Message-ID: <4EE8777C.4090704@redhat.com>
Date:	Wed, 14 Dec 2011 11:16:28 +0100
From:	Jerome Marchand <jmarchan@...hat.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	Ajeet Yadav <ajeet.yadav.77@...il.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Nitin Gupta <ngupta@...are.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] Staging: zram: print the disk size in KB

On 12/14/2011 08:52 AM, Geert Uytterhoeven wrote:
> On Tue, Dec 13, 2011 at 06:16, Ajeet Yadav <ajeet.yadav.77@...il.com> wrote:
>> From a5d5ba92b5af9134e617986884856334c377e1d0 Mon Sep 17 00:00:00 2001
>> From: Ajeet Yadav <ajeet.yadav.77@...il.com>
>> Date: Mon, 12 Dec 2011 18:42:30 +0530
>> Subject: [PATCH 1/1] Staging: zram: print the disk size in KB
>>
>> Total memory size is in KB, but the zram disk size was not
>> printed in KB, correct the figure in KB units.
> 
> Kelvin bytes?
> 
>> Signed-off-by: Ajeet Yadav <ajeet.yadav.77@...il.com>
>> ---
>>  drivers/staging/zram/zram_drv.c |    2 +-
>>  1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c
>> index 09de99f..ff591e3 100644
>> --- a/drivers/staging/zram/zram_drv.c
>> +++ b/drivers/staging/zram/zram_drv.c
>> @@ -126,7 +126,7 @@ static void zram_set_disksize(struct zram *zram,
>> size_t totalram_bytes)
>>                "\tMemory Size: %zu kB\n"
> 
> kilobytes? Either this ...
> 
>>                "\tSize you selected: %llu kB\n"
> 
> ... and this should be KiB ...

I'm personally all for the international system of units, but there
are *a lot* of places in the kernel where the inaccurate kilo = 2^10
notation is used. I haven't checked, but I would guess that in kernel
kB stands more often for 1024 bytes than 1000 bytes.

Is there any coding rule about its usage?

Jerome

> 
>>                "Continuing anyway ...\n",
>> -               totalram_bytes >> 10, zram->disksize
>> +               totalram_bytes >> 10, zram->disksize >> 10
> 
> ... or these should be / 1000 instead of >> 10.
> 
>>                );
>>        }
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds

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