Re: [PATCH] s390: add support for TIF_NOTIFY_SIGNAL

[Jens Axboe <axboe@kernel.dk>]

On 11/1/20 10:31 AM, Heiko Carstens wrote:
> On Thu, Oct 29, 2020 at 10:21:11AM -0600, Jens Axboe wrote:
>> Wire up TIF_NOTIFY_SIGNAL handling for s390.
>>
>> Cc: linux-s390@vger.kernel.org
>> Signed-off-by: Jens Axboe <axboe@kernel.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/s390/include/asm/thread_info.h | 2 ++
>>  arch/s390/kernel/entry.S            | 7 ++++++-
>>  2 files changed, 8 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/s390/include/asm/thread_info.h b/arch/s390/include/asm/thread_info.h
>> index 13a04fcf7762..0045341ade48 100644
>> --- a/arch/s390/include/asm/thread_info.h
>> +++ b/arch/s390/include/asm/thread_info.h
>> @@ -65,6 +65,7 @@ void arch_setup_new_exec(void);
>>  #define TIF_GUARDED_STORAGE	4	/* load guarded storage control block */
>>  #define TIF_PATCH_PENDING	5	/* pending live patching update */
>>  #define TIF_PGSTE		6	/* New mm's will use 4K page tables */
>> +#define TIF_NOTIFY_SIGNAL	7	/* signal notifications exist */
>>  #define TIF_ISOLATE_BP		8	/* Run process with isolated BP */
>>  #define TIF_ISOLATE_BP_GUEST	9	/* Run KVM guests with isolated BP */
>>  
>> @@ -82,6 +83,7 @@ void arch_setup_new_exec(void);
>>  #define TIF_SYSCALL_TRACEPOINT	27	/* syscall tracepoint instrumentation */
>>  
>>  #define _TIF_NOTIFY_RESUME	BIT(TIF_NOTIFY_RESUME)
>> +#define _TIF_NOTIFY_SIGNAL	BIT(TIF_NOTIFY_SIGNAL)
>>  #define _TIF_SIGPENDING		BIT(TIF_SIGPENDING)
>>  #define _TIF_NEED_RESCHED	BIT(TIF_NEED_RESCHED)
>>  #define _TIF_UPROBE		BIT(TIF_UPROBE)
>> diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
>> index 86235919c2d1..a30d891e8045 100644
>> --- a/arch/s390/kernel/entry.S
>> +++ b/arch/s390/kernel/entry.S
>> @@ -52,7 +52,8 @@ STACK_SIZE  = 1 << STACK_SHIFT
>>  STACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE
>>  
>>  _TIF_WORK	= (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
>> -		   _TIF_UPROBE | _TIF_GUARDED_STORAGE | _TIF_PATCH_PENDING)
>> +		   _TIF_UPROBE | _TIF_GUARDED_STORAGE | _TIF_PATCH_PENDING | \
>> +		   _TIF_NOTIFY_SIGNAL)
>>  _TIF_TRACE	= (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
>>  		   _TIF_SYSCALL_TRACEPOINT)
>>  _CIF_WORK	= (_CIF_ASCE_PRIMARY | _CIF_ASCE_SECONDARY | _CIF_FPU)
>> @@ -463,6 +464,8 @@ ENTRY(system_call)
>>  #endif
>>  	TSTMSK	__PT_FLAGS(%r11),_PIF_SYSCALL_RESTART
>>  	jo	.Lsysc_syscall_restart
>> +	TSTMSK	__TI_flags(%r12),_TIF_NOTIFY_SIGNAL
>> +	jo	.Lsysc_sigpending
>>  	TSTMSK	__TI_flags(%r12),_TIF_SIGPENDING
>>  	jo	.Lsysc_sigpending
>>  	TSTMSK	__TI_flags(%r12),_TIF_NOTIFY_RESUME
>> @@ -857,6 +860,8 @@ ENTRY(io_int_handler)
>>  #endif
>>  	TSTMSK	__TI_flags(%r12),_TIF_SIGPENDING
>>  	jo	.Lio_sigpending
>> +	TSTMSK	__TI_flags(%r12),_TIF_NOTIFY_SIGNAL
>> +	jo	.Lio_sigpending
>>  	TSTMSK	__TI_flags(%r12),_TIF_NOTIFY_RESUME
>>  	jo	.Lio_notify_resume
>>  	TSTMSK	__TI_flags(%r12),_TIF_GUARDED_STORAGE
> 
> (full quote so you can make sense of the patch below).
> 
> Please merge the patch below into this one. With that:

Thanks Heiko, I merged that in, does look better. And I've added your
acked-by.

-- 
Jens Axboe