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From: Thomas Gleixner <tglx@linutronix.de>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
	x86@kernel.org, Paul McKenney <paulmck@kernel.org>,
	"Joel Fernandes \(Google\)" <joel@joelfernandes.org>,
	"Steven Rostedt \(VMware\)" <rostedt@goodmis.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Alexei Starovoitov <ast@kernel.org>,
	Frederic Weisbecker <frederic@kernel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Brian Gerst <brgerst@gmail.com>, Juergen Gross <jgross@suse.com>,
	Alexandre Chartre <alexandre.chartre@oracle.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	kvm@vger.kernel.org
Subject: Re: [RESEND][patch V3 06/23] bug: Annotate WARN/BUG/stackfail as noinstr safe
Date: Thu, 02 Apr 2020 23:49:08 +0200	[thread overview]
Message-ID: <87369lmucr.fsf@nanos.tec.linutronix.de> (raw)
In-Reply-To: <20200402210115.zpk52dyc6ofg2bve@treble>

Josh Poimboeuf <jpoimboe@redhat.com> writes:
> On Fri, Mar 20, 2020 at 07:00:02PM +0100, Thomas Gleixner wrote:
>> --- a/arch/x86/include/asm/bug.h
>> +++ b/arch/x86/include/asm/bug.h
>> @@ -70,13 +70,16 @@ do {									\
>>  #define HAVE_ARCH_BUG
>>  #define BUG()							\
>>  do {								\
>> +	instr_begin();						\
>>  	_BUG_FLAGS(ASM_UD2, 0);					\
>>  	unreachable();						\
>>  } while (0)
>
> For visual symmetry at least, it seems like this wants an instr_end()
> before the unreachable().  Does objtool not like that?

There was some hickup, but can't remember. Will try to reproduce with
the latest version of Peter's objtool changes.

>> --- a/include/asm-generic/bug.h
>> +++ b/include/asm-generic/bug.h
>> @@ -83,14 +83,19 @@ extern __printf(4, 5)
>>  void warn_slowpath_fmt(const char *file, const int line, unsigned taint,
>>  		       const char *fmt, ...);
>>  #define __WARN()		__WARN_printf(TAINT_WARN, NULL)
>> -#define __WARN_printf(taint, arg...)					\
>> -	warn_slowpath_fmt(__FILE__, __LINE__, taint, arg)
>> +#define __WARN_printf(taint, arg...) do {				\
>> +	instr_begin();							\
>> +	warn_slowpath_fmt(__FILE__, __LINE__, taint, arg);		\
>> +	instr_end();							\
>> +	while (0)
>
> Missing a '}' before the 'while'?

Yep, fixed that locally already.

Thanks,

        tglx

  parent reply	other threads:[~2020-04-02 21:49 UTC|newest]

Thread overview: 67+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-20 17:59 [patch V3 00/23] x86/entry: Consolidation part II (syscalls) Thomas Gleixner
2020-03-20 17:59 ` [RESEND][patch " Thomas Gleixner
2020-03-20 17:59 ` [patch V3 01/23] rcu: Dont acquire lock in NMI handler in rcu_nmi_enter_common() Thomas Gleixner
2020-03-20 17:59   ` [RESEND][patch " Thomas Gleixner
2020-03-24 15:37   ` [patch " Frederic Weisbecker
2020-03-20 17:59 ` [patch V3 02/23] rcu: Add comments marking transitions between RCU watching and not Thomas Gleixner
2020-03-20 17:59   ` [RESEND][patch " Thomas Gleixner
2020-03-24 15:38   ` [patch " Frederic Weisbecker
2020-03-20 17:59 ` [patch V3 03/23] vmlinux.lds.h: Create section for protection against instrumentation Thomas Gleixner
2020-03-20 17:59   ` [RESEND][patch " Thomas Gleixner
2020-03-24 12:26   ` Borislav Petkov
2020-04-03  8:08   ` Alexandre Chartre
2020-03-20 18:00 ` [patch V3 04/23] kprobes: Prevent probes in .noinstr.text section Thomas Gleixner
2020-03-20 18:00   ` [RESEND][patch " Thomas Gleixner
2020-03-23 14:00   ` [patch " Masami Hiramatsu
2020-03-23 16:03     ` Thomas Gleixner
2020-03-24  5:49       ` Masami Hiramatsu
2020-03-24  9:47         ` Thomas Gleixner
2020-03-25 13:39           ` Masami Hiramatsu
2020-03-20 18:00 ` [patch V3 05/23] tracing: Provide lockdep less trace_hardirqs_on/off() variants Thomas Gleixner
2020-03-20 18:00   ` [RESEND][patch " Thomas Gleixner
2020-04-03  8:34   ` Alexandre Chartre
2020-03-20 18:00 ` [patch V3 06/23] bug: Annotate WARN/BUG/stackfail as noinstr safe Thomas Gleixner
2020-03-20 18:00   ` [RESEND][patch " Thomas Gleixner
2020-04-02 21:01   ` Josh Poimboeuf
2020-04-02 21:34     ` Peter Zijlstra
2020-04-02 21:43       ` Josh Poimboeuf
2020-04-02 21:49     ` Thomas Gleixner [this message]
2020-03-20 18:00 ` [patch V3 07/23] lockdep: Prepare for noinstr sections Thomas Gleixner
2020-03-20 18:00   ` [RESEND][patch " Thomas Gleixner
2020-03-20 18:00 ` [patch V3 08/23] x86/entry: Mark enter_from_user_mode() noinstr Thomas Gleixner
2020-03-20 18:00   ` [RESEND][patch " Thomas Gleixner
2020-03-20 18:00 ` [patch V3 09/23] x86/entry/common: Protect against instrumentation Thomas Gleixner
2020-03-20 18:00   ` [RESEND][patch " Thomas Gleixner
2020-03-20 18:00 ` [patch V3 10/23] x86/entry: Move irq tracing on syscall entry to C-code Thomas Gleixner
2020-03-20 18:00   ` [RESEND][patch " Thomas Gleixner
2020-03-20 18:00 ` [patch V3 11/23] x86/entry: Move irq flags tracing to prepare_exit_to_usermode() Thomas Gleixner
2020-03-20 18:00   ` [RESEND][patch " Thomas Gleixner
2020-03-20 18:00 ` [patch V3 12/23] context_tracking: Ensure that the critical path cannot be instrumented Thomas Gleixner
2020-03-20 18:00   ` [RESEND][patch " Thomas Gleixner
2020-03-20 18:00 ` [patch V3 13/23] lib/smp_processor_id: Move it into noinstr section Thomas Gleixner
2020-03-20 18:00   ` [RESEND][patch " Thomas Gleixner
2020-03-20 18:00 ` [patch V3 14/23] x86/speculation/mds: Mark mds_user_clear_cpu_buffers() __always_inline Thomas Gleixner
2020-03-20 18:00   ` [RESEND][patch " Thomas Gleixner
2020-03-20 18:00 ` [patch V3 15/23] x86/entry/64: Check IF in __preempt_enable_notrace() thunk Thomas Gleixner
2020-03-20 18:00   ` [RESEND][patch " Thomas Gleixner
2020-03-20 18:00 ` [patch V3 16/23] x86/entry/64: Mark ___preempt_schedule_notrace() thunk noinstr Thomas Gleixner
2020-03-20 18:00   ` [RESEND][patch " Thomas Gleixner
2020-03-20 18:00 ` [patch V3 17/23] rcu/tree: Mark the idle relevant functions noinstr Thomas Gleixner
2020-03-20 18:00   ` [RESEND][patch " Thomas Gleixner
2020-03-24 16:09   ` Paul E. McKenney
2020-03-24 19:28     ` Thomas Gleixner
2020-03-24 19:58       ` Paul E. McKenney
2020-03-20 18:00 ` [patch V3 18/23] x86/kvm: Move context tracking where it belongs Thomas Gleixner
2020-03-20 18:00   ` [RESEND][patch " Thomas Gleixner
2020-03-20 18:00 ` [patch V3 19/23] x86/kvm/vmx: Add hardirq tracing to guest enter/exit Thomas Gleixner
2020-03-20 18:00   ` [RESEND][patch " Thomas Gleixner
2020-03-24 23:03   ` Peter Zijlstra
2020-03-24 23:21     ` Thomas Gleixner
2020-03-20 18:00 ` [patch V3 20/23] x86/kvm/svm: Handle hardirqs proper on " Thomas Gleixner
2020-03-20 18:00   ` [RESEND][patch " Thomas Gleixner
2020-03-20 18:00 ` [patch V3 21/23] context_tracking: Make guest_enter/exit_irqoff() .noinstr ready Thomas Gleixner
2020-03-20 18:00   ` [RESEND][patch " Thomas Gleixner
2020-03-20 18:00 ` [patch V3 22/23] x86/kvm/vmx: Move guest enter/exit into .noinstr.text Thomas Gleixner
2020-03-20 18:00   ` [RESEND][patch " Thomas Gleixner
2020-03-20 18:00 ` [patch V3 23/23] x86/kvm/svm: " Thomas Gleixner
2020-03-20 18:00   ` [RESEND][patch " Thomas Gleixner

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