linux-kernel - Re: [PATCH v2 00/13] arch, mm: deprecate DISCONTIGMEM

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Date:   Tue, 1 Dec 2020 16:07:34 +0100
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        Jonathan Corbet <corbet@....net>,
        Matt Turner <mattst88@...il.com>, Meelis Roos <mroos@...ux.ee>,
        Michael Schmitz <schmitzmic@...il.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Russell King <linux@...linux.org.uk>,
        Tony Luck <tony.luck@...el.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        Will Deacon <will@...nel.org>, linux-alpha@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-ia64@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-mm@...ck.org, linux-snps-arc@...ts.infradead.org,
        Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH v2 00/13] arch, mm: deprecate DISCONTIGMEM

On 12/1/20 2:56 PM, Mike Rapoport wrote:
> (added Jens)
> 
> On Tue, Dec 01, 2020 at 01:16:05PM +0100, John Paul Adrian Glaubitz wrote:
>> Hi Mike!
>>
>> On 12/1/20 1:10 PM, Mike Rapoport wrote:
>>> On Tue, Dec 01, 2020 at 12:35:09PM +0100, John Paul Adrian Glaubitz wrote:
>>>> Hi Mike!
>>>>
>>>> On 12/1/20 11:29 AM, Mike Rapoport wrote: 
>>>>> These changes are in linux-mm tree (https://www.ozlabs.org/~akpm/mmotm/
>>>>> with a mirror at https://github.com/hnaz/linux-mm)
>>>>>
>>>>> I beleive they will be coming in 5.11.
>>>>
>>>> Just pulled from that tree and gave it a try, it actually fails to build:
>>>>
>>>>   LDS     arch/ia64/kernel/vmlinux.lds
>>>>   AS      arch/ia64/kernel/entry.o
>>>> arch/ia64/kernel/entry.S: Assembler messages:
>>>> arch/ia64/kernel/entry.S:710: Error: Operand 2 of `and' should be a general register
>>>> arch/ia64/kernel/entry.S:710: Error: qualifying predicate not followed by instruction
>>>> arch/ia64/kernel/entry.S:848: Error: Operand 2 of `and' should be a general register
>>>> arch/ia64/kernel/entry.S:848: Error: qualifying predicate not followed by instruction
>>>>   GEN     usr/initramfs_data.cpio
>>>> make[1]: *** [scripts/Makefile.build:364: arch/ia64/kernel/entry.o] Error 1
>>>> make: *** [Makefile:1797: arch/ia64/kernel] Error 2
>>>> make: *** Waiting for unfinished jobs....
>>>>   CC      init/do_mounts_initrd.o
>>>>   SHIPPED usr/initramfs_inc_data
>>>>   AS      usr/initramfs_data.o
>>>
>>> Hmm, it was buidling fine with v5.10-rc2-mmotm-2020-11-07-21-40.
>>> I'll try to see what could cause this.
>>>
>>> Do you build with defconfig or do you use a custom config?
>>
>> That's with "localmodconfig", see attached configuration file.
> 
> Thanks.
> It seems that the recent addition of TIF_NOTIFY_SIGNAL to ia64 in
> linux-next caused the issue. Can you please try the below patch?
> 
> From c4d06cf1c2938e6b2302e7ed0be95c3401181ebb Mon Sep 17 00:00:00 2001
> From: Mike Rapoport <rppt@...ux.ibm.com>
> Date: Tue, 1 Dec 2020 15:40:28 +0200
> Subject: [PATCH] ia64: fix TIF_NOTIFY_SIGNAL implementation
> 
> * Replace wrong spelling of TIF_SIGNAL_NOTIFY with the correct
>   TIF_NOTIFY_SIGNAL
> * Remove mistyped plural in test_thread_flag() call in
>   process::do_notify_resume_user()
> * Use number 5 for TIF_NOTIFY_SIGNAL as 7 is too big and assembler is not
>   happy:
> 
>   AS      arch/ia64/kernel/entry.o
> arch/ia64/kernel/entry.S: Assembler messages:
> arch/ia64/kernel/entry.S:710: Error: Operand 2 of `and' should be an 8-bit integer (-128-127)
> arch/ia64/kernel/entry.S:710: Error: qualifying predicate not followed by instruction
> 
> Reported-by: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
> Fixes: bbb026da151c ("ia64: add support for TIF_NOTIFY_SIGNAL")
> Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
> ---
> 
> The Fixes tag is based on the commit in next-20201201, I'm not 100% sure
> it is stable
> 
>  arch/ia64/include/asm/thread_info.h | 4 ++--
>  arch/ia64/kernel/process.c          | 2 +-
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/ia64/include/asm/thread_info.h b/arch/ia64/include/asm/thread_info.h
> index 759d7d68a5f2..51d20cb37706 100644
> --- a/arch/ia64/include/asm/thread_info.h
> +++ b/arch/ia64/include/asm/thread_info.h
> @@ -103,8 +103,8 @@ struct thread_info {
>  #define TIF_SYSCALL_TRACE	2	/* syscall trace active */
>  #define TIF_SYSCALL_AUDIT	3	/* syscall auditing active */
>  #define TIF_SINGLESTEP		4	/* restore singlestep on return to user mode */
> +#define TIF_NOTIFY_SIGNAL	5	/* signal notification exist */
>  #define TIF_NOTIFY_RESUME	6	/* resumption notification requested */
> -#define TIF_NOTIFY_SIGNAL	7	/* signal notification exist */
>  #define TIF_MEMDIE		17	/* is terminating due to OOM killer */
>  #define TIF_MCA_INIT		18	/* this task is processing MCA or INIT */
>  #define TIF_DB_DISABLED		19	/* debug trap disabled for fsyscall */
> @@ -116,7 +116,7 @@ struct thread_info {
>  #define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
>  #define _TIF_SYSCALL_TRACEAUDIT	(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP)
>  #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
> -#define _TIF_SIGNAL_NOTIFY	(1 << TIF_SIGNAL_NOTIFY)
> +#define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
>  #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
>  #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
>  #define _TIF_MCA_INIT		(1 << TIF_MCA_INIT)
> diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
> index 468525fc64e0..ee394abcc03e 100644
> --- a/arch/ia64/kernel/process.c
> +++ b/arch/ia64/kernel/process.c
> @@ -172,7 +172,7 @@ do_notify_resume_user(sigset_t *unused, struct sigscratch *scr, long in_syscall)
>  
>  	/* deal with pending signal delivery */
>  	if (test_thread_flag(TIF_SIGPENDING) ||
> -	    test_thread_flags(TIF_NOTIFY_SIGNAL)) {
> +	    test_thread_flag(TIF_NOTIFY_SIGNAL)) {
>  		local_irq_enable();	/* force interrupt enable */
>  		ia64_do_signal(scr, in_syscall);
>  	}
> 

This fixes the issue for me.

Tested-by: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@...ian.org
`. `'   Freie Universitaet Berlin - glaubitz@...sik.fu-berlin.de
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