linux-kernel - Re: [PATCH v3 04/25] mm/debug: Add VM_BUG_ON_FOLIO and VM_WARN_ON_ONCE

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Date:   Mon, 1 Mar 2021 16:25:28 -0500
From:   Zi Yan <ziy@...dia.com>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
CC:     <linux-fsdevel@...r.kernel.org>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 04/25] mm/debug: Add VM_BUG_ON_FOLIO and
 VM_WARN_ON_ONCE_FOLIO

On 28 Jan 2021, at 2:03, Matthew Wilcox (Oracle) wrote:

> These are the folio equivalents of VM_BUG_ON_PAGE and VM_WARN_ON_ONCE_PAGE.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> ---
>  include/linux/mmdebug.h | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
>
> diff --git a/include/linux/mmdebug.h b/include/linux/mmdebug.h
> index 5d0767cb424a..77d24e1dcaec 100644
> --- a/include/linux/mmdebug.h
> +++ b/include/linux/mmdebug.h
> @@ -23,6 +23,13 @@ void dump_mm(const struct mm_struct *mm);
>  			BUG();						\
>  		}							\
>  	} while (0)
> +#define VM_BUG_ON_FOLIO(cond, folio)					\
> +	do {								\
> +		if (unlikely(cond)) {					\
> +			dump_page(&folio->page, "VM_BUG_ON_FOLIO(" __stringify(cond)")");\
> +			BUG();						\
> +		}							\
> +	} while (0)
>  #define VM_BUG_ON_VMA(cond, vma)					\
>  	do {								\
>  		if (unlikely(cond)) {					\
> @@ -48,6 +55,17 @@ void dump_mm(const struct mm_struct *mm);
>  	}								\
>  	unlikely(__ret_warn_once);					\
>  })
> +#define VM_WARN_ON_ONCE_FOLIO(cond, folio)	({			\
> +	static bool __section(".data.once") __warned;			\
> +	int __ret_warn_once = !!(cond);					\
> +									\
> +	if (unlikely(__ret_warn_once && !__warned)) {			\
> +		dump_page(&folio->page, "VM_WARN_ON_ONCE_FOLIO(" __stringify(cond)")");\
> +		__warned = true;					\
> +		WARN_ON(1);						\
> +	}								\
> +	unlikely(__ret_warn_once);					\
> +})
>
>  #define VM_WARN_ON(cond) (void)WARN_ON(cond)
>  #define VM_WARN_ON_ONCE(cond) (void)WARN_ON_ONCE(cond)
> @@ -56,11 +74,13 @@ void dump_mm(const struct mm_struct *mm);
>  #else
>  #define VM_BUG_ON(cond) BUILD_BUG_ON_INVALID(cond)
>  #define VM_BUG_ON_PAGE(cond, page) VM_BUG_ON(cond)
> +#define VM_BUG_ON_FOLIO(cond, folio) VM_BUG_ON(cond)
>  #define VM_BUG_ON_VMA(cond, vma) VM_BUG_ON(cond)
>  #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_ONCE_PAGE(cond, page)  BUILD_BUG_ON_INVALID(cond)
> +#define VM_WARN_ON_ONCE_FOLIO(cond, folio)  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)
>  #endif
> -- 
> 2.29.2

LGTM.

Reviewed-by: Zi Yan <ziy@...dia.com>

—
Best Regards,
Yan Zi

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