linux-kernel - Re: [PATCH v5 1/2] x86/purgatory: Disable various profiling and sanitizing options

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Date:   Tue, 17 Mar 2020 14:08:38 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/2] x86/purgatory: Disable various profiling and
 sanitizing options

Hi,

On 3/13/20 7:28 PM, Borislav Petkov wrote:
> On Thu, Mar 12, 2020 at 12:49:50PM +0100, Hans de Goede wrote:
>> Since the purgatory is a special stand-alone binary, we need to disable
> 
> Pls use passive voice in your commit message: no "we" or "I", etc, and
> describe your changes in imperative mood.
> 
> Also, pls read section "2) Describe your changes" in
> Documentation/process/submitting-patches.rst for more details.

Ok, fixed for v6 and I've also rebased the series on tip/master for v6.

Regards,

Hans



> 
>> various profiling and sanitizing options. Having these options enabled
>> typically will cause dependency on various special symbols exported by
>> special libs / stubs used by these frameworks. Since the purgatory is
>> special we do not link against these stubs causing missing symbols in
>> the purgatory if we do not disable these options.
>>
>> This commit syncs the set of disabled profiling and sanitizing options
> 
> Avoid having "This patch" or "This commit" in the commit message. It is
> tautologically useless.
> 
> Also, do
> 
> $ git grep 'This patch' Documentation/process
> 
> for more details.
> 
> Those two review comments apply to patch 2's commit message too, pls fix
> them there too.
> 
>> with that from drivers/firmware/efi/libstub/Makefile, adding
>> -DDISABLE_BRANCH_PROFILING to the CFLAGS and setting:
>>
>> GCOV_PROFILE                    := n
>> UBSAN_SANITIZE                  := n
>>
>> This fixes broken references to ftrace_likely_update when
>> CONFIG_TRACE_BRANCH_PROFILING is enabled and to __gcov_init and
>> __gcov_exit when CONFIG_GCOV_KERNEL is enabled.
>>
>> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
>> ---
>> Changes in v5:
>> -Not only add -DDISABLE_BRANCH_PROFILING to the CFLAGS but also set:
>>   GCOV_PROFILE                    := n
>>   UBSAN_SANITIZE                  := n
>>
>> Changes in v4:
>> -This is a new patch in v4 of this series
>> ---
>>   arch/x86/purgatory/Makefile | 4 +++-
>>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> $ test-apply.sh -g /tmp/01-x86-purgatory-disable_various_profiling_and_sanitizing_options.patch
> checking file arch/x86/purgatory/Makefile
> Hunk #1 FAILED at 17.
> Hunk #2 succeeded at 27 (offset 2 lines).
> 1 out of 2 hunks FAILED
> 
> This happens because tip/master already has KCSAN merged in and it adds
> 
> KCSAN_SANITIZE  := n
> 
> there.
> 
> Please redo the patches against current tip/master.
> 
> Thx.
>