linux-kernel - Re: [PATCH] x86_32, entry, selftests: Add a selftest for kernel entries from vm86 mode

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Date:	Mon, 01 Jun 2015 17:27:33 -0600
From:	Shuah Khan <shuahkh@....samsung.com>
To:	Andy Lutomirski <luto@...capital.net>
CC:	Andy Lutomirski <luto@...nel.org>, Ingo Molnar <mingo@...nel.org>,
	Jan Beulich <JBeulich@...e.com>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Shuah Khan <shuahkh@....samsung.com>
Subject: Re: [PATCH] x86_32, entry, selftests: Add a selftest for kernel entries
 from vm86 mode

On 06/01/2015 04:54 PM, Andy Lutomirski wrote:
> On Mon, Jun 1, 2015 at 9:02 AM, Shuah Khan <shuahkh@....samsung.com> wrote:
>> On 05/29/2015 03:58 PM, Andy Lutomirski wrote:
>>> Test a couple of special cases in 32-bit kernels for entries from
>>> vm86 mode.  This will OOPS both old kernels due to a bug and and
>>> 4.1-rc5 due to a regression I introduced, and it should make sure
>>> that the SYSENTER-from-vm86-mode hack in the kernel keeps working.
>>>
>>> Tests: 394838c96013 x86/asm/entry/32: Fix user_mode() misuses
>>> Tests: 7ba554b5ac69 x86/asm/entry/32: Really make user_mode() work correctly for VM86 mode
>>> Signed-off-by: Andy Lutomirski <luto@...nel.org>
>>> ---
>>>
>>> Ingo, Shuah: I think this should go in through -tip.  (In general, I think
>>> new x86 tests that don't have interesting interactions with the kselftest
>>> infrastructure should go in through -tip, especially tests such as this one
>>> that are related to recent regressions.)
>>
>> No problem going through tip. Could you please make sure
>>
>> "make kselftest" run from top level and
>> tools/testing/selftests/kselftest_install.sh
>>
>> don't break?
> 
> Both 'make kselftest -j12 TARGETS=x86' and
> ../../../tools/testing/selftests/kselftest_install.sh work for me.
> (The .. thing is annoying -- would it make sense to fix it to work
> from the kernel tree root?)
> 

What is annoying about it and how would it get solved by making it
run from the kernel tree root?

-- Shuah


-- 
Shuah Khan
Sr. Linux Kernel Developer
Open Source Innovation Group
Samsung Research America (Silicon Valley)
shuahkh@....samsung.com | (970) 217-8978
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