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From: Trond Myklebust <trondmy@primarydata.com>
To: "linux-kselftest@vger.kernel.org"
	<linux-kselftest@vger.kernel.org>,
	"elfring@users.sourceforge.net" <elfring@users.sourceforge.net>,
	"linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>,
	"kernel-janitors@vger.kernel.org"
	<kernel-janitors@vger.kernel.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"peterz@infradead.org" <peterz@infradead.org>,
	"rostedt@goodmis.org" <rostedt@goodmis.org>
Subject: Re: Difficulties for compilation without extra optimisation
Date: Sun, 3 Dec 2017 15:17:32 +0000	[thread overview]
Message-ID: <1512314250.3673.6.camel@primarydata.com> (raw)
In-Reply-To: <a2ac6d05-fdd6-82bb-075e-b7eb81b516fe@users.sourceforge.net>

On Sun, 2017-12-03 at 15:15 +0100, SF Markus Elfring wrote:
> Hello,
> 
> I came along some software modules where I suggested source code
> adjustments.
> 
> Example:
> nfs/write: Use common error handling code in
> nfs_lock_and_join_requests()
> 
> https://lkml.org/lkml/2017/11/7/599
> https://patchwork.kernel.org/patch/10047013/
> https://lkml.kernel.org/r/<7f072f78-eef4-6d87-d233-cee71dac5a32@users
> .sourceforge.net>;
> 
> I would like to check corresponding build results then without extra
> optimisation applied by the compiler.
> But I got surprised by error messages for a command like the
> following.
> 
> elfring@Sonne:~/Projekte/Linux/next-patched> my_cc=/usr/bin/gcc-7 &&
> LANG=C make -j4 CC="${my_cc}" HOSTCC="${my_cc}" EXTRA_CFLAGS='-O0'
> allmodconfig fs/nfs/write.o
> …
> In file included from ./include/linux/compiler.h:58:0,
>                  from ./include/uapi/linux/stddef.h:1,
>                  from ./include/linux/stddef.h:4,
>                  from ./include/uapi/linux/posix_types.h:4,
>                  from ./include/uapi/linux/types.h:13,
>                  from ./include/linux/types.h:5,
>                  from fs/nfs/write.c:9:
> ./arch/x86/include/asm/jump_label.h: In function
> ‘trace_nfs_writeback_page_enter’:
> ./include/linux/compiler-gcc.h:275:38: warning: asm operand 0
> probably doesn’t match constraints
>  #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while
> (0)
> …
> 
> 
> How do you think about to improve this software situation anyhow?

I'm not seeing anything obviously wrong with the NFS use of tracepoints
there, and the warning suggests rather that gcc has an issue with the
inlined assembly code in jump_label.h.

Ccing Peter Zijlstra (who appears to have been the last person to touch
that assembly code) and Steven Rostedt.

-- 
Trond Myklebust
Linux NFS client maintainer, PrimaryData
trond.myklebust@primarydata.com

WARNING: multiple messages have this Message-ID (diff)
From: Trond Myklebust <trondmy@primarydata.com>
To: kernel-janitors@vger.kernel.org
Subject: Re: Difficulties for compilation without extra optimisation
Date: Sun, 03 Dec 2017 15:17:32 +0000	[thread overview]
Message-ID: <1512314250.3673.6.camel@primarydata.com> (raw)
In-Reply-To: <a2ac6d05-fdd6-82bb-075e-b7eb81b516fe@users.sourceforge.net>

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WARNING: multiple messages have this Message-ID (diff)
From: Trond Myklebust <trondmy@primarydata.com>
To: "linux-kselftest@vger.kernel.org"
	<linux-kselftest@vger.kernel.org>,
	"elfring@users.sourceforge.net" <elfring@users.sourceforge.net>,
	"linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>,
	"kernel-janitors@vger.kernel.org"
	<kernel-janitors@vger.kernel.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"peterz@infradead.org" <peterz@infradead.org>,
	"rostedt@goodmis.org" <rostedt@goodmis.org>
Subject: Re: Difficulties for compilation without extra optimisation
Date: Sun, 3 Dec 2017 15:17:32 +0000	[thread overview]
Message-ID: <1512314250.3673.6.camel@primarydata.com> (raw)
In-Reply-To: <a2ac6d05-fdd6-82bb-075e-b7eb81b516fe@users.sourceforge.net>

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WARNING: multiple messages have this Message-ID (diff)
From: trondmy at primarydata.com (Trond Myklebust)
Subject: [Linux-kselftest-mirror] Difficulties for compilation without extra optimisation
Date: Sun, 3 Dec 2017 15:17:32 +0000	[thread overview]
Message-ID: <1512314250.3673.6.camel@primarydata.com> (raw)
In-Reply-To: <a2ac6d05-fdd6-82bb-075e-b7eb81b516fe@users.sourceforge.net>

On Sun, 2017-12-03 at 15:15 +0100, SF Markus Elfring wrote:
> Hello,
> 
> I came along some software modules where I suggested source code
> adjustments.
> 
> Example:
> nfs/write: Use common error handling code in
> nfs_lock_and_join_requests()
> 
> https://lkml.org/lkml/2017/11/7/599
> https://patchwork.kernel.org/patch/10047013/
> https://lkml.kernel.org/r/<7f072f78-eef4-6d87-d233-cee71dac5a32 at users
> .sourceforge.net>;
> 
> I would like to check corresponding build results then without extra
> optimisation applied by the compiler.
> But I got surprised by error messages for a command like the
> following.
> 
> elfring at Sonne:~/Projekte/Linux/next-patched> my_cc=/usr/bin/gcc-7 &&
> LANG=C make -j4 CC="${my_cc}" HOSTCC="${my_cc}" EXTRA_CFLAGS='-O0'
> allmodconfig fs/nfs/write.o
> …
> In file included from ./include/linux/compiler.h:58:0,
>                  from ./include/uapi/linux/stddef.h:1,
>                  from ./include/linux/stddef.h:4,
>                  from ./include/uapi/linux/posix_types.h:4,
>                  from ./include/uapi/linux/types.h:13,
>                  from ./include/linux/types.h:5,
>                  from fs/nfs/write.c:9:
> ./arch/x86/include/asm/jump_label.h: In function
> ‘trace_nfs_writeback_page_enter’:
> ./include/linux/compiler-gcc.h:275:38: warning: asm operand 0
> probably doesn’t match constraints
>  #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while
> (0)
> …
> 
> 
> How do you think about to improve this software situation anyhow?

I'm not seeing anything obviously wrong with the NFS use of tracepoints
there, and the warning suggests rather that gcc has an issue with the
inlined assembly code in jump_label.h.

Ccing Peter Zijlstra (who appears to have been the last person to touch
that assembly code) and Steven Rostedt.

-- 
Trond Myklebust
Linux NFS client maintainer, PrimaryData
trond.myklebust at primarydata.com

WARNING: multiple messages have this Message-ID (diff)
From: trondmy@primarydata.com (Trond Myklebust)
Subject: [Linux-kselftest-mirror] Difficulties for compilation without extra optimisation
Date: Sun, 3 Dec 2017 15:17:32 +0000	[thread overview]
Message-ID: <1512314250.3673.6.camel@primarydata.com> (raw)
Message-ID: <20171203151732.TmZtdSum5LY5NKp92eE5qHHd1wbenbJmAOIQ47k7LYA@z> (raw)
In-Reply-To: <a2ac6d05-fdd6-82bb-075e-b7eb81b516fe@users.sourceforge.net>

On Sun, 2017-12-03@15:15 +0100, SF Markus Elfring wrote:
> Hello,
> 
> I came along some software modules where I suggested source code
> adjustments.
> 
> Example:
> nfs/write: Use common error handling code in
> nfs_lock_and_join_requests()
> 
> https://lkml.org/lkml/2017/11/7/599
> https://patchwork.kernel.org/patch/10047013/
> https://lkml.kernel.org/r/<7f072f78-eef4-6d87-d233-cee71dac5a32 at users
> .sourceforge.net>;
> 
> I would like to check corresponding build results then without extra
> optimisation applied by the compiler.
> But I got surprised by error messages for a command like the
> following.
> 
> elfring at Sonne:~/Projekte/Linux/next-patched> my_cc=/usr/bin/gcc-7 &&
> LANG=C make -j4 CC="${my_cc}" HOSTCC="${my_cc}" EXTRA_CFLAGS='-O0'
> allmodconfig fs/nfs/write.o
> …
> In file included from ./include/linux/compiler.h:58:0,
>                  from ./include/uapi/linux/stddef.h:1,
>                  from ./include/linux/stddef.h:4,
>                  from ./include/uapi/linux/posix_types.h:4,
>                  from ./include/uapi/linux/types.h:13,
>                  from ./include/linux/types.h:5,
>                  from fs/nfs/write.c:9:
> ./arch/x86/include/asm/jump_label.h: In function
> ‘trace_nfs_writeback_page_enter’:
> ./include/linux/compiler-gcc.h:275:38: warning: asm operand 0
> probably doesn’t match constraints
>  #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while
> (0)
> …
> 
> 
> How do you think about to improve this software situation anyhow?

I'm not seeing anything obviously wrong with the NFS use of tracepoints
there, and the warning suggests rather that gcc has an issue with the
inlined assembly code in jump_label.h.

Ccing Peter Zijlstra (who appears to have been the last person to touch
that assembly code) and Steven Rostedt.

-- 
Trond Myklebust
Linux NFS client maintainer, PrimaryData
trond.myklebust at primarydata.com

  reply	other threads:[~2017-12-03 15:17 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-07 16:53 [PATCH RFC v1] nfs/write: Use common error handling code in nfs_lock_and_join_requests() SF Markus Elfring
2017-11-07 16:53 ` SF Markus Elfring
2017-12-03 14:15 ` Difficulties for compilation without extra optimisation SF Markus Elfring
2017-12-03 14:15   ` [Linux-kselftest-mirror] " SF Markus Elfring
2017-12-03 14:15   ` elfring
2017-12-03 14:15   ` SF Markus Elfring
2017-12-03 15:17   ` Trond Myklebust [this message]
2017-12-03 15:17     ` [Linux-kselftest-mirror] " Trond Myklebust
2017-12-03 15:17     ` trondmy
2017-12-03 15:17     ` Trond Myklebust
2017-12-03 15:17     ` Trond Myklebust
2017-12-03 21:22     ` Steven Rostedt
2017-12-03 21:22       ` [Linux-kselftest-mirror] " Steven Rostedt
2017-12-03 21:22       ` rostedt
2017-12-03 21:22       ` Steven Rostedt
2017-12-03 21:56       ` SF Markus Elfring
2017-12-03 21:56         ` [Linux-kselftest-mirror] " SF Markus Elfring
2017-12-03 21:56         ` elfring
2017-12-03 21:56         ` SF Markus Elfring
2017-12-04  2:40         ` Steven Rostedt
2017-12-04  2:40           ` [Linux-kselftest-mirror] " Steven Rostedt
2017-12-04  2:40           ` rostedt
2017-12-04  2:40           ` Steven Rostedt
2017-12-04  9:55           ` SF Markus Elfring
2017-12-04  9:55             ` [Linux-kselftest-mirror] " SF Markus Elfring
2017-12-04  9:55             ` elfring
2017-12-04  9:55             ` SF Markus Elfring
2017-12-04  9:00       ` SF Markus Elfring
2017-12-04  9:00         ` [Linux-kselftest-mirror] " SF Markus Elfring
2017-12-04  9:00         ` elfring
2017-12-04  9:00         ` SF Markus Elfring
2017-12-04  9:48         ` Steven Rostedt
2017-12-04  9:48           ` [Linux-kselftest-mirror] " Steven Rostedt
2017-12-04  9:48           ` rostedt
2017-12-04  9:48           ` Steven Rostedt
2017-12-04 10:18           ` SF Markus Elfring
2017-12-04 10:18             ` [Linux-kselftest-mirror] " SF Markus Elfring
2017-12-04 10:18             ` elfring
2017-12-04 10:18             ` SF Markus Elfring

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