linux-kernel - Re: [PATCH] mm/doc: Include highmem.h in kernel-doc

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Date:   Fri, 23 Jul 2021 13:32:06 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH] mm/doc: Include highmem.h in kernel-doc

On Thu, 22 Jul 2021 03:18:42 +0100 "Matthew Wilcox (Oracle)" <willy@...radead.org> wrote:

> There is lots of good documentation in highmem.h that isn't being pulled
> into the html documentation.  Fix up a couple of minor glitches and
> include it.
> 
> --- a/include/linux/highmem.h
> +++ b/include/linux/highmem.h
>
> ...
>
> @@ -156,6 +156,7 @@ static inline void *kmap_atomic(struct page *page);
>   * the side effects of kmap_atomic(), i.e. reenabling pagefaults and
>   * preemption.
>   */
> +static inline void kunmap_atomic(void *addr);
>  
>  /* Highmem related interfaces for management code */
>  static inline unsigned int nr_free_highpages(void);

This hunk broke the i386 allmodconfig build.


In file included from ./include/linux/highmem.h:14,
                 from ./include/linux/bio.h:8,
                 from ./include/linux/blkdev.h:18,
                 from ./include/linux/blk-cgroup.h:23,
                 from ./include/linux/writeback.h:14,
                 from ./include/linux/memcontrol.h:22,
                 from ./include/linux/swap.h:9,
                 from ./include/linux/suspend.h:5,
                 from arch/x86/kernel/asm-offsets.c:13:
./include/linux/highmem-internal.h:216:1: error: expected identifier or '(' before 'do'
  216 | do {        \
      | ^~
./include/linux/highmem.h:122:20: note: in expansion of macro 'kunmap_atomic'
  122 | static inline void kunmap_atomic(void *addr);
      |                    ^~~~~~~~~~~~~
./include/linux/highmem-internal.h:219:3: error: expected identifier or '(' before 'while'
  219 | } while (0)
      |   ^~~~~
./include/linux/highmem.h:122:20: note: in expansion of macro 'kunmap_atomic'
  122 | static inline void kunmap_atomic(void *addr);
      |                    ^~~~~~~~~~~~~
make[1]: *** [scripts/Makefile.build:117: arch/x86/kernel/asm-offsets.s] Error 1
make: *** [Makefile:1213: prepare0] Error 2

I think I can see what you were trying to do there.  How about we
instead move the kunmap_atomic() kerneldoc to an appropriate place?