linux-kernel - Re: [PATCH 2/2] arch:mm: Use hugetlb_bad

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Date:	Wed, 23 Mar 2016 09:25:01 +0530
From:	Vaishali Thakkar <vaishali.thakkar@...cle.com>
To:	Hillf Danton <hillf.zj@...baba-inc.com>, akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	"'Mike Kravetz'" <mike.kravetz@...cle.com>,
	"'Naoya Horiguchi'" <n-horiguchi@...jp.nec.com>,
	"'Michal Hocko'" <mhocko@...e.com>,
	"'Yaowei Bai'" <baiyaowei@...s.chinamobile.com>,
	"'Dominik Dingel'" <dingel@...ux.vnet.ibm.com>,
	"'Kirill A. Shutemov'" <kirill.shutemov@...ux.intel.com>,
	"'Paul Gortmaker'" <paul.gortmaker@...driver.com>,
	"'Dave Hansen'" <dave.hansen@...ux.intel.com>,
	"'Chris Metcalf'" <cmetcalf@...hip.com>
Subject: Re: [PATCH 2/2] arch:mm: Use hugetlb_bad_size



On Wednesday 23 March 2016 08:45 AM, Hillf Danton wrote:
>> Update the setup_hugepagesz function to call the routine
>> hugetlb_bad_size when unsupported hugepage size is found.
>>
>> Misc:
>>   - Silent 80 characters warning
>>
>> Signed-off-by: Vaishali Thakkar <vaishali.thakkar@...cle.com>
>> Cc: Mike Kravetz <mike.kravetz@...cle.com>
>> Cc: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
>> Cc: Hillf Danton <hillf.zj@...baba-inc.com>
>> Cc: Michal Hocko <mhocko@...e.com>
>> Cc: Yaowei Bai <baiyaowei@...s.chinamobile.com>
>> Cc: Dominik Dingel <dingel@...ux.vnet.ibm.com>
>> Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
>> Cc: Paul Gortmaker <paul.gortmaker@...driver.com>
>> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
>> ---
>> - Please note that the patch is tested for x86 only. But as this
>>   is one line change I just changed them. So, it would be good if
>>   the patch can be tested for other architectures before adding
>>   this in to mainline.
>> - Not sure if printk related checkpatch.pl warning should be resolved
>>   with this patch as code is not consistent in architectures. May be
>>   one separate patch for changing all printk's to pr_<level> kind of
>>   debugging functions would be good.
>> ---
>>  arch/arm64/mm/hugetlbpage.c   | 1 +
>>  arch/metag/mm/hugetlbpage.c   | 1 +
>>  arch/powerpc/mm/hugetlbpage.c | 7 +++++--
>>  arch/tile/mm/hugetlbpage.c    | 7 ++++++-
> Looks Chris Metcalf <cmetcalf@...hip.com> not cced;-(
>
>>  arch/x86/mm/hugetlbpage.c     | 1 +
>>  5 files changed, 14 insertions(+), 3 deletions(-)
>>
> Help more if separate patches rather than a monolithic one are 
> delivered to the arch maintainers. 

Do you want me to send new version of the patchset breaking this patch in
to separate patches?

>> diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
>> index 589fd28..aa8aee7 100644
>> --- a/arch/arm64/mm/hugetlbpage.c
>> +++ b/arch/arm64/mm/hugetlbpage.c
>> @@ -307,6 +307,7 @@ static __init int setup_hugepagesz(char *opt)
>>  	} else if (ps == PUD_SIZE) {
>>  		hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
>>  	} else {
>> +		hugetlb_bad_size();
>>  		pr_err("hugepagesz: Unsupported page size %lu K\n", ps >> 10);
>>  		return 0;
>>  	}
>> diff --git a/arch/metag/mm/hugetlbpage.c b/arch/metag/mm/hugetlbpage.c
>> index b38700a..db1b7da 100644
>> --- a/arch/metag/mm/hugetlbpage.c
>> +++ b/arch/metag/mm/hugetlbpage.c
>> @@ -239,6 +239,7 @@ static __init int setup_hugepagesz(char *opt)
>>  	if (ps == (1 << HPAGE_SHIFT)) {
>>  		hugetlb_add_hstate(HPAGE_SHIFT - PAGE_SHIFT);
>>  	} else {
>> +		hugetlb_bad_size();
>>  		pr_err("hugepagesz: Unsupported page size %lu M\n",
>>  		       ps >> 20);
>>  		return 0;
>> diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
>> index 6dd272b..a437ff7 100644
>> --- a/arch/powerpc/mm/hugetlbpage.c
>> +++ b/arch/powerpc/mm/hugetlbpage.c
>> @@ -772,8 +772,11 @@ static int __init hugepage_setup_sz(char *str)
>>
>>  	size = memparse(str, &str);
>>
>> -	if (add_huge_page_size(size) != 0)
>> -		printk(KERN_WARNING "Invalid huge page size specified(%llu)\n", size);
>> +	if (add_huge_page_size(size) != 0) {
>> +		hugetlb_bad_size();
>> +		printk(KERN_WARNING "Invalid huge page size specified(%llu)\n",
>> +		       size);
>> +	}
>>
>>  	return 1;
>>  }
>> diff --git a/arch/tile/mm/hugetlbpage.c b/arch/tile/mm/hugetlbpage.c
>> index e212c64..77ceaa3 100644
>> --- a/arch/tile/mm/hugetlbpage.c
>> +++ b/arch/tile/mm/hugetlbpage.c
>> @@ -308,11 +308,16 @@ static bool saw_hugepagesz;
>>
>>  static __init int setup_hugepagesz(char *opt)
>>  {
>> +	int rc;
>> +
>>  	if (!saw_hugepagesz) {
>>  		saw_hugepagesz = true;
>>  		memset(huge_shift, 0, sizeof(huge_shift));
>>  	}
>> -	return __setup_hugepagesz(memparse(opt, NULL));
>> +	rc = __setup_hugepagesz(memparse(opt, NULL));
>> +	if (rc)
>> +		hugetlb_bad_size();
>> +	return rc;
>>  }
>>  __setup("hugepagesz=", setup_hugepagesz);
>>
>> diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c
>> index 740d7ac..3ec44f8 100644
>> --- a/arch/x86/mm/hugetlbpage.c
>> +++ b/arch/x86/mm/hugetlbpage.c
>> @@ -165,6 +165,7 @@ static __init int setup_hugepagesz(char *opt)
>>  	} else if (ps == PUD_SIZE && cpu_has_gbpages) {
>>  		hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
>>  	} else {
>> +		hugetlb_bad_size();
>>  		printk(KERN_ERR "hugepagesz: Unsupported page size %lu M\n",
>>  			ps >> 20);
>>  		return 0;
>> --
>> 2.1.4

-- 
Vaishali