From: Logan Gunthorpe <logang@deltatee.com>
To: Pasha Tatashin <Pavel.Tatashin@microsoft.com>,
Alexander Duyck <alexander.h.duyck@linux.intel.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>
Cc: "mhocko@suse.com" <mhocko@suse.com>,
"dave.jiang@intel.com" <dave.jiang@intel.com>,
"mingo@kernel.org" <mingo@kernel.org>,
"dave.hansen@intel.com" <dave.hansen@intel.com>,
"jglisse@redhat.com" <jglisse@redhat.com>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"dan.j.williams@intel.com" <dan.j.williams@intel.com>,
"kirill.shutemov@linux.intel.com"
<kirill.shutemov@linux.intel.com>
Subject: Re: [PATCH v4 1/5] mm: Provide kernel parameter to allow disabling page init poisoning
Date: Fri, 21 Sep 2018 13:41:12 -0600 [thread overview]
Message-ID: <4d984974-ff16-35e4-76ff-f5e43e5e90da@deltatee.com> (raw)
In-Reply-To: <a40a78c0-207b-03b7-344c-847b12a4f896@microsoft.com>
On 2018-09-21 1:04 PM, Pasha Tatashin wrote:
>
>> + pr_err("vm_debug option '%c' unknown. skipped\n",
>> + *str);
>> + }
>> +
>> + str++;
>> + }
>> +out:
>> + if (page_init_poisoning && !__page_init_poisoning)
>> + pr_warn("Page struct poisoning disabled by kernel command line option 'vm_debug'\n");
>
> New lines '\n' can be removed, they are not needed for kprintfs.
No, that's not correct.
A printk without a newline termination is not emitted
as output until the next printk call. (To support KERN_CONT).
Therefore removing the '\n' causes a printk to not be printed when it is
called which can cause long delayed messages and subtle problems when
debugging. Always keep the newline in place even though the kernel will
add one for you if it's missing.
Logan
next prev parent reply other threads:[~2018-09-21 19:41 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-20 22:24 [PATCH v4 0/5] Address issues slowing persistent memory initialization Alexander Duyck
2018-09-20 22:26 ` [PATCH v4 1/5] mm: Provide kernel parameter to allow disabling page init poisoning Alexander Duyck
2018-09-21 19:04 ` Pasha Tatashin
2018-09-21 19:41 ` Logan Gunthorpe [this message]
2018-09-21 19:52 ` Pasha Tatashin
2018-09-20 22:27 ` [PATCH v4 2/5] mm: Create non-atomic version of SetPageReserved for init use Alexander Duyck
2018-09-21 19:06 ` Pasha Tatashin
2018-09-20 22:29 ` [PATCH v4 3/5] mm: Defer ZONE_DEVICE page initialization to the point where we init pgmap Alexander Duyck
2018-09-21 19:50 ` Pasha Tatashin
2018-09-21 20:03 ` Alexander Duyck
2018-09-21 20:14 ` Pasha Tatashin
2018-09-20 22:29 ` [PATCH v4 4/5] async: Add support for queueing on specific node Alexander Duyck
2018-09-21 14:57 ` Dan Williams
2018-09-21 17:02 ` Alexander Duyck
2018-09-29 8:15 ` [LKP] [async] 06f4f5bfb3: BUG:sleeping_function_called_from_invalid_context_at_include/linux/percpu-rwsem.h kernel test robot
2018-09-20 22:29 ` [PATCH v4 5/5] nvdimm: Schedule device registration on node local to the device Alexander Duyck
2018-09-20 22:59 ` Dan Williams
2018-09-21 0:16 ` Alexander Duyck
2018-09-21 0:36 ` Dan Williams
2018-09-21 1:33 ` Alexander Duyck
2018-09-21 2:46 ` Dan Williams
2018-09-21 14:46 ` Alexander Duyck
2018-09-21 14:56 ` Dan Williams
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