linux-kernel - RE: [PATCH v29 3/4] mm/page_poison: expose page_poisoning

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Date:   Mon, 26 Mar 2018 03:24:00 +0000
From:   "Wang, Wei W" <wei.w.wang@...el.com>
To:     "virtio-dev@...ts.oasis-open.org" <virtio-dev@...ts.oasis-open.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "mst@...hat.com" <mst@...hat.com>,
        "mhocko@...nel.org" <mhocko@...nel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
CC:     "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "liliang.opensource@...il.com" <liliang.opensource@...il.com>,
        "yang.zhang.wz@...il.com" <yang.zhang.wz@...il.com>,
        "quan.xu0@...il.com" <quan.xu0@...il.com>,
        "nilal@...hat.com" <nilal@...hat.com>,
        "riel@...hat.com" <riel@...hat.com>,
        "huangzhichao@...wei.com" <huangzhichao@...wei.com>
Subject: RE: [PATCH v29 3/4] mm/page_poison: expose page_poisoning_enabled
 to kernel modules

On Monday, March 26, 2018 10:40 AM, Wang, Wei W wrote:
> Subject: [PATCH v29 3/4] mm/page_poison: expose page_poisoning_enabled
> to kernel modules
> 
> In some usages, e.g. virtio-balloon, a kernel module needs to know if page
> poisoning is in use. This patch exposes the page_poisoning_enabled function
> to kernel modules.
> 
> Signed-off-by: Wei Wang <wei.w.wang@...el.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Michal Hocko <mhocko@...nel.org>
> Cc: Michael S. Tsirkin <mst@...hat.com>
> ---
>  mm/page_poison.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/mm/page_poison.c b/mm/page_poison.c index e83fd44..762b472
> 100644
> --- a/mm/page_poison.c
> +++ b/mm/page_poison.c
> @@ -17,6 +17,11 @@ static int early_page_poison_param(char *buf)  }
> early_param("page_poison", early_page_poison_param);
> 
> +/**
> + * page_poisoning_enabled - check if page poisoning is enabled
> + *
> + * Return true if page poisoning is enabled, or false if not.
> + */
>  bool page_poisoning_enabled(void)
>  {
>  	/*
> @@ -29,6 +34,7 @@ bool page_poisoning_enabled(void)
> 
> 	(!IS_ENABLED(CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC) &&
>  		debug_pagealloc_enabled()));
>  }
> +EXPORT_SYMBOL_GPL(page_poisoning_enabled);
> 
>  static void poison_page(struct page *page)  {
> --
> 2.7.4


Could we get a review of this patch? We've reviewed other parts, and this one seems to be the last part of this feature. Thanks.

Best,
Wei