linux-kernel - Re: [PATCH] staging: lustre: include linux/highmem.h when needed

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Message-ID: <874liov1xv.fsf@notabene.neil.brown.name>
Date:   Thu, 31 May 2018 15:17:32 +1000
From:   NeilBrown <neilb@...e.com>
To:     Arnd Bergmann <arnd@...db.de>, Oleg Drokin <oleg.drokin@...el.com>,
        Andreas Dilger <andreas.dilger@...el.com>,
        James Simmons <jsimmons@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Doug Oucharek <dougso@...com>,
        Dmitry Eremin <dmitry.eremin@...el.com>,
        Ingo Molnar <mingo@...nel.org>, lustre-devel@...ts.lustre.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: lustre: include linux/highmem.h when needed

On Wed, May 30 2018, Arnd Bergmann wrote:

> Something in recent linux-next kernels caused linux/highmem.h to
> no longer be included implicitly from o2iblnd_cb.c, causing a build
> failure:
>
> drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c: In function 'kiblnd_kvaddr_to_page':
> drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c:549:15: error: 'PKMAP_BASE' undeclared (first use in this function); did you mean 'RTM_BASE'?
>   if (vaddr >= PKMAP_BASE &&
>                ^~~~~~~~~~
>                RTM_BASE
> drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c:549:15: note: each undeclared identifier is reported only once for each function it appears in
> drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c:550:28: error: 'LAST_PKMAP' undeclared (first use in this function); did you mean 'AT_HWCAP'?
>       vaddr < (PKMAP_BASE + LAST_PKMAP * PAGE_SIZE)) {
>                             ^~~~~~~~~~
>                             AT_HWCAP
>
> This adds back an explicit include for the header.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thanks for finding and fixing this.  I did recently reduce the number
of include files that were automatically included everywhere.  Clearly
some config combinations didn't get tested properly.

Reviewed-by: NeilBrown <neilb@...e.com>

Thanks,
NeilBrown


> ---
>  drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c
> index 47eb8b4c28db..65b7a62943ad 100644
> --- a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c
> +++ b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c
> @@ -35,6 +35,7 @@
>   * Author: Eric Barton <eric@...tonsoftware.com>
>   */
>  
> +#include <linux/highmem.h>
>  #include "o2iblnd.h"
>  
>  #define MAX_CONN_RACES_BEFORE_ABORT 20
> -- 
> 2.9.0

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