linux-kernel - Re: [PATCH v11 03/11] mm/hugetlb: Free the vmemmap pages associated with each HugeTLB page

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Date:   Tue, 22 Dec 2020 17:32:48 +0100
From:   Oscar Salvador <osalvador@...e.de>
To:     Muchun Song <songmuchun@...edance.com>
Cc:     corbet@....net, mike.kravetz@...cle.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, x86@...nel.org, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        viro@...iv.linux.org.uk, akpm@...ux-foundation.org,
        paulmck@...nel.org, mchehab+huawei@...nel.org,
        pawan.kumar.gupta@...ux.intel.com, rdunlap@...radead.org,
        oneukum@...e.com, anshuman.khandual@....com, jroedel@...e.de,
        almasrymina@...gle.com, rientjes@...gle.com, willy@...radead.org,
        mhocko@...e.com, song.bao.hua@...ilicon.com, david@...hat.com,
        naoya.horiguchi@....com, duanxiongchun@...edance.com,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v11 03/11] mm/hugetlb: Free the vmemmap pages associated
 with each HugeTLB page

On Tue, Dec 22, 2020 at 10:24:32PM +0800, Muchun Song wrote:
> diff --git a/include/linux/mmdebug.h b/include/linux/mmdebug.h
> index 5d0767cb424a..eff5b13a6945 100644
> --- a/include/linux/mmdebug.h
> +++ b/include/linux/mmdebug.h
> @@ -37,6 +37,13 @@ void dump_mm(const struct mm_struct *mm);
>  			BUG();						\
>  		}							\
>  	} while (0)
> +#define VM_WARN_ON_PAGE(cond, page)					\
> +	do {								\
> +		if (unlikely(cond)) {					\
> +			dump_page(page, "VM_WARN_ON_PAGE(" __stringify(cond)")");\
> +			WARN_ON(1);					\
> +		}							\
> +	} while (0)
>  #define VM_WARN_ON_ONCE_PAGE(cond, page)	({			\
>  	static bool __section(".data.once") __warned;			\
>  	int __ret_warn_once = !!(cond);					\
> @@ -60,6 +67,7 @@ void dump_mm(const struct mm_struct *mm);
>  #define VM_BUG_ON_MM(cond, mm) VM_BUG_ON(cond)
>  #define VM_WARN_ON(cond) BUILD_BUG_ON_INVALID(cond)
>  #define VM_WARN_ON_ONCE(cond) BUILD_BUG_ON_INVALID(cond)
> +#define VM_WARN_ON_PAGE(cond, page) BUILD_BUG_ON_INVALID(cond)
>  #define VM_WARN_ON_ONCE_PAGE(cond, page)  BUILD_BUG_ON_INVALID(cond)
>  #define VM_WARN_ONCE(cond, format...) BUILD_BUG_ON_INVALID(cond)
>  #define VM_WARN(cond, format...) BUILD_BUG_ON_INVALID(cond)

Take this off this patch and make it a preparation patch prior to this one.
A new VM_WARN_ON_ macro does not make much sense in this patch as it is
not related.

I will have a look later today at the other changes, but so far looks good.

-- 
Oscar Salvador
SUSE L3