linux-kernel - Re: [patch 8/8] x86/entry: Move irqflags tracing to do_int80_syscall

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Date:   Fri, 28 Feb 2020 14:49:36 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Alexandre Chartre <alexandre.chartre@...cle.com>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Steven Rostedt <rostedt@...dmis.org>,
        Brian Gerst <brgerst@...il.com>,
        Juergen Gross <jgross@...e.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [patch 8/8] x86/entry: Move irqflags tracing to do_int80_syscall_32()

Alexandre Chartre <alexandre.chartre@...cle.com> writes:
> On 2/25/20 11:08 PM, Thomas Gleixner wrote:
>> which cleans up the ASM maze.
>> 
>> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
>> ---
>>   arch/x86/entry/common.c          |    8 +++++++-
>>   arch/x86/entry/entry_32.S        |    9 ++-------
>>   arch/x86/entry/entry_64_compat.S |   14 +++++---------
>>   3 files changed, 14 insertions(+), 17 deletions(-)
>> 
>> --- a/arch/x86/entry/common.c
>> +++ b/arch/x86/entry/common.c
>> @@ -333,6 +333,7 @@ void do_syscall_64_irqs_on(unsigned long
>>   {
>>   	syscall_entry_fixups();
>>   	do_syscall_64_irqs_on(nr, regs);
>> +	trace_hardirqs_on();
>>   }
>
> trace_hardirqs_on() is already called through syscall_return_slowpath()
> (from the previous patch):
>
> do_syscall_64()
>    -> do_syscall_64_irqs_on()
>      -> syscall_return_slowpath()
>        -> trace_hardirqs_on()

Duh, indeed.