linux-kernel - Re: [PATCH] blackfin: Makefile: Skip reloc overflow issue when COMPILE

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Date:	Fri, 24 Apr 2015 22:28:17 +0800
From:	Chen Gang <xili_gchen_5257@...mail.com>
To:	Steven Miao <realmz6@...il.com>
CC:	Richard Weinberger <richard.weinberger@...il.com>,
	bfin <adi-buildroot-devel@...ts.sourceforge.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] blackfin: Makefile: Skip reloc overflow issue when COMPILE_TEST
 enabled

On 4/24/15 16:20, Steven Miao wrote:
> On Thu, Apr 23, 2015 at 10:30 PM, Chen Gang <xili_gchen_5257@...mail.com> wrote:
>>
>> OK, thanks. I guess your meaning is:
>>
>>  - If the kernel is too big, it may let the pc which wants to call L1
>>    space fail.
>>
>>  - So the kernel is too big to cause this issue, but it is nothing with
>>    'overwritten' in my original patch comments.
>>
> Yes, it is.

OK, thanks.

>>  - We can treat it as environments limitation, then can use COMPILE_TEST
>>    for it. So this patch is still OK, except the related comments need
>>    be improved (at least need to remove 'overwritten').
>>
> If pc-relative CALL will fail, there will be "relocation truncated to
> fit: R_BFIN_PCREL24" warnings.

OK, thanks. for me, we need to skip these warnings when COMPILE_TEST
is set, so can continue compiling (or will cause building break).

>>
>> I guess, what I said above is meaningless (although it is correct).
>>
>>>>  - if kernel is too big, the contents before l1.text (the other contents
>>>>    in .init.text) will override it, so ld reports issues.
>>
> Actually the kernel which is large the 16M could not happen, large
> size kernel image is not sugguested on a embedded system.
> 

OK, thanks. So for me, it should only happen when COMPILE_TEST is set,
should not happen in real world using.


Thanks.
-- 
Chen Gang

Open, share, and attitude like air, water, and life which God blessed
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