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Date:   Thu, 12 Apr 2018 14:10:36 -0700
From:   Matthew Wilcox <willy@infradead.org>
To:     Ross Zwisler <zwisler@gmail.com>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Matthew Wilcox <mawilcox@microsoft.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Linux MM <linux-mm@kvack.org>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>,
        linux-nilfs@vger.kernel.org
Subject: Re: [PATCH v9 07/61] xarray: Add the xa_lock to the radix_tree_root
Message-ID: <20180412211036.GB18364@bombadil.infradead.org>
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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.