linux-kernel - Re: [PATCH v5 2/2] lib/test-string_helpers.c: add string_get

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Message-ID: <87egglhikm.fsf@vitty.brq.redhat.com>
Date:	Fri, 23 Oct 2015 14:31:53 +0200
From:	Vitaly Kuznetsov <vkuznets@...hat.com>
To:	Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	James Bottomley <JBottomley@...n.com>,
	linux-kernel@...r.kernel.org,
	"K. Y. Srinivasan" <kys@...rosoft.com>
Subject: Re: [PATCH v5 2/2] lib/test-string_helpers.c: add string_get_size() tests

Rasmus Villemoes <linux@...musvillemoes.dk> writes:

> On Thu, Sep 17 2015, Vitaly Kuznetsov <vkuznets@...hat.com> wrote:
>
>> +
>> +static __init void test_string_get_size(void)
>> +{
>> +	test_string_get_size_one(16384, 512, STRING_UNITS_2, "8.00 MiB");
>> +	test_string_get_size_one(8192, 4096, STRING_UNITS_10, "32.7 MB");
>
> This is a little late,

Thanks for the ping, it turns out this patch was never merged (though
the one fixing the issue was), I'll have to resend.

> but I just noticed that string_get_size with
> STRING_UNITS_10, block size >= 1024 and sufficiently large size seems to
> be broken. Yes, 32.7 MB is what it produces, but is it what it should
> give? 8192*4096 = 33554432, so I'd expect "33.5 MB". It does give that
> when we pass size=65536 and block_size=512; a combination with the same
> product.
>
> I think the problem is that the remainder coming out of the while
> (blk_size >= divisor[units]) loop is dropped on the floor in the
> subsequent size > exp case - but I'm too lazy right now to figure out how
> to fix it.

Ok, I'll take a look.

-- 
  Vitaly
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