linux-kernel - Re: [PATCH v2] Documentation/mm: Add information about kmap_local

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Message-ID: <68a9b3aa-d064-ed6a-2bcd-9423eb4f595c@infradead.org>
Date:   Sat, 1 Jul 2023 08:21:20 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>,
        Jonathan Corbet <corbet@....net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Mike Rapoport (IBM)" <rppt@...nel.org>,
        Deming Wang <wangdeming@...pur.com>,
        Ira Weiny <ira.weiny@...el.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Matthew Wilcox <willy@...radead.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Peter Collingbourne <pcc@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vlastimil Babka <vbabka@...e.cz>, Will Deacon <will@...nel.org>
Subject: Re: [PATCH v2] Documentation/mm: Add information about
 kmap_local_folio()



On 7/1/23 07:19, Fabio M. De Francesco wrote:

> 
> v1->v2: I thought to Cc everybody but Andrew :-( Sorry, fixed.
> 	Andrew, can you please take this patch through your tree?
> 
>  Documentation/mm/highmem.rst | 27 +++++++++++++++------------
>  1 file changed, 15 insertions(+), 12 deletions(-)
> 
> diff --git a/Documentation/mm/highmem.rst b/Documentation/mm/highmem.rst
> index c964e0848702..bb9584f167a6 100644
> --- a/Documentation/mm/highmem.rst
> +++ b/Documentation/mm/highmem.rst
> @@ -51,11 +51,14 @@ Temporary Virtual Mappings
>  The kernel contains several ways of creating temporary mappings. The following
>  list shows them in order of preference of use.
>  
> -* kmap_local_page().  This function is used to require short term mappings.
> -  It can be invoked from any context (including interrupts) but the mappings
> -  can only be used in the context which acquired them.
> -
> -  This function should always be used, whereas kmap_atomic() and kmap() have
> +* kmap_local_page(), kmap_local_folio() - These functions are used to require

                                                                         acquire ?

> +  short term mappings. They can be invoked from any context (including
> +  interrupts) but the mappings can only be used in the context which acquired
> +  them. The only differences between them consist in the first taking a pointer
> +  to a struct page and the second taking a pointer to struct folio and the byte
> +  offset within the folio which identifies the page.

-- 
~Randy