linux-kernel - Re: [PATCH v9 07/61] xarray: Add the xa_lock to the radix_tree

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Date:   Thu, 12 Apr 2018 15:16:23 -0600
From:   Ross Zwisler <zwisler@...il.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>,
        linux-nilfs@...r.kernel.org
Subject: Re: [PATCH v9 07/61] xarray: Add the xa_lock to the radix_tree_root

On Thu, Apr 12, 2018 at 3:10 PM, Matthew Wilcox <willy@...radead.org> wrote:
> On Thu, Apr 12, 2018 at 02:59:32PM -0600, Ross Zwisler wrote:
>> This is causing build breakage in the radix tree test suite in the
>> current linux/master:
>>
>> ./linux/../../../../include/linux/idr.h: In function ‘idr_init_base’:
>> ./linux/../../../../include/linux/radix-tree.h:129:2: warning:
>> implicit declaration of function ‘spin_lock_init’; did you mean
>> ‘spinlock_t’? [-Wimplicit-function-declaration]
>
> Argh.  That was added two patches later in
> "xarray: Add definition of struct xarray":
>
> diff --git a/tools/include/linux/spinlock.h b/tools/include/linux/spinlock.h
> index b21b586b9854..4ec4d2cbe27a 100644
> --- a/tools/include/linux/spinlock.h
> +++ b/tools/include/linux/spinlock.h
> @@ -6,8 +6,9 @@
>  #include <stdbool.h>
>
>  #define spinlock_t             pthread_mutex_t
> -#define DEFINE_SPINLOCK(x)     pthread_mutex_t x = PTHREAD_MUTEX_INITIALIZER;
> +#define DEFINE_SPINLOCK(x)     pthread_mutex_t x = PTHREAD_MUTEX_INITIALIZER
>  #define __SPIN_LOCK_UNLOCKED(x)        (pthread_mutex_t)PTHREAD_MUTEX_INITIALIZER
> +#define spin_lock_init(x)      pthread_mutex_init(x, NULL)
>
>  #define spin_lock_irqsave(x, f)                (void)f, pthread_mutex_lock(x)
>  #define spin_unlock_irqrestore(x, f)   (void)f, pthread_mutex_unlock(x)
>
> I didn't pick up that it was needed this early on in the patch series.

Hmmm..I don't know if it's a patch ordering issue, because this
happens with the current linux/master where presumably all the patches
are present?