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

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Message-ID: <0afe01d184b2$3f564ac0$be02e040$@alibaba-inc.com>
Date:	Wed, 23 Mar 2016 11:15:25 +0800
From:	"Hillf Danton" <hillf.zj@...baba-inc.com>
To:	"'Vaishali Thakkar'" <vaishali.thakkar@...cle.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

> 
> 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. 

> 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