linux-kernel - Re: [PATCH] microblaze: add support for TIF_NOTIFY

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Message-ID: <1877a472-5fbe-5fa7-6ec4-a7bafc0790fd@kernel.dk>
Date:   Mon, 9 Nov 2020 07:17:24 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Michal Simek <monstr@...str.eu>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] microblaze: add support for TIF_NOTIFY_SIGNAL

On 11/9/20 4:19 AM, Michal Simek wrote:
> 
> 
> On 29. 10. 20 17:16, Jens Axboe wrote:
>> Wire up TIF_NOTIFY_SIGNAL handling for microblaze.
>>
>> Cc: Michal Simek <monstr@...str.eu>
>> Signed-off-by: Jens Axboe <axboe@...nel.dk>
>> ---
>>
>> 5.11 has support queued up for TIF_NOTIFY_SIGNAL, see this posting
>> for details:
>>
>> https://lore.kernel.org/io-uring/20201026203230.386348-1-axboe@kernel.dk/
>>
>> As part of that work, I'm adding TIF_NOTIFY_SIGNAL support to all archs,
>> as that will enable a set of cleanups once all of them support it. I'm
>> happy carrying this patch if need be, or it can be funelled through the
>> arch tree. Let me know.
>>
>>  arch/microblaze/include/asm/thread_info.h | 2 ++
>>  arch/microblaze/kernel/signal.c           | 3 ++-
>>  2 files changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/microblaze/include/asm/thread_info.h b/arch/microblaze/include/asm/thread_info.h
>> index ad8e8fcb90d3..44f5ca331862 100644
>> --- a/arch/microblaze/include/asm/thread_info.h
>> +++ b/arch/microblaze/include/asm/thread_info.h
>> @@ -107,6 +107,7 @@ static inline struct thread_info *current_thread_info(void)
>>  #define TIF_NEED_RESCHED	3 /* rescheduling necessary */
>>  /* restore singlestep on return to user mode */
>>  #define TIF_SINGLESTEP		4
>> +#define TIF_NOTIFY_SIGNAL	5	/* signal notifications exist */
>>  #define TIF_MEMDIE		6	/* is terminating due to OOM killer */
>>  #define TIF_SYSCALL_AUDIT	9       /* syscall auditing active */
>>  #define TIF_SECCOMP		10      /* secure computing */
>> @@ -119,6 +120,7 @@ static inline struct thread_info *current_thread_info(void)
>>  #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
>>  #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
>>  #define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
>> +#define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
>>  #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
>>  #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
>>  #define _TIF_SECCOMP		(1 << TIF_SECCOMP)
>> diff --git a/arch/microblaze/kernel/signal.c b/arch/microblaze/kernel/signal.c
>> index f11a0ccccabc..5a8d173d7b75 100644
>> --- a/arch/microblaze/kernel/signal.c
>> +++ b/arch/microblaze/kernel/signal.c
>> @@ -313,7 +313,8 @@ static void do_signal(struct pt_regs *regs, int in_syscall)
>>  
>>  asmlinkage void do_notify_resume(struct pt_regs *regs, int in_syscall)
>>  {
>> -	if (test_thread_flag(TIF_SIGPENDING))
>> +	if (test_thread_flag(TIF_SIGPENDING) ||
>> +	    test_thread_flag(TIF_NOTIFY_SIGNAL))
>>  		do_signal(regs, in_syscall);
>>  
>>  	if (test_thread_flag(TIF_NOTIFY_RESUME))
>>
> 
> Applied for 5.11.

Would you mind if I carry this patch with an ack? I've got further fixes
and cleanups that are enabled once all archs have added support.

-- 
Jens Axboe