linux-kernel - Re: [PATCH v5 1/4] resource: Move reparent_resources() to kernel/resource.c and make it public

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Date:   Tue, 12 Jun 2018 11:55:46 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Baoquan He <bhe@...hat.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        akpm@...ux-foundation.org, robh+dt@...nel.org,
        dan.j.williams@...el.com, nicolas.pitre@...aro.org,
        josh@...htriplett.org, fengguang.wu@...el.com, bp@...e.de,
        patrik.r.jakobsson@...il.com, airlied@...ux.ie, kys@...rosoft.com,
        haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        dmitry.torokhov@...il.com, frowand.list@...il.com,
        keith.busch@...el.com, jonathan.derrick@...el.com,
        lorenzo.pieralisi@....com, bhelgaas@...gle.com, tglx@...utronix.de,
        brijesh.singh@....com, jglisse@...hat.com, thomas.lendacky@....com,
        gregkh@...uxfoundation.org, baiyaowei@...s.chinamobile.com,
        richard.weiyang@...il.com, devel@...uxdriverproject.org,
        linux-input@...r.kernel.org, linux-nvdimm@...ts.01.org,
        devicetree@...r.kernel.org, linux-pci@...r.kernel.org,
        ebiederm@...ssion.com, vgoyal@...hat.com, dyoung@...hat.com,
        yinghai@...nel.org, kexec@...ts.infradead.org, monstr@...str.eu,
        davem@...emloft.net, chris@...kel.net, jcmvbkbc@...il.com,
        gustavo@...ovan.org, maarten.lankhorst@...ux.intel.com,
        seanpaul@...omium.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, Baoquan He <bhe@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH v5 1/4] resource: Move reparent_resources() to
 kernel/resource.c and make it public

Hi Baoquan,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.17 next-20180608]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Baoquan-He/resource-Use-list_head-to-link-sibling-resource/20180612-113600
config: i386-tinyconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

Note: the linux-review/Baoquan-He/resource-Use-list_head-to-link-sibling-resource/20180612-113600 HEAD 5545e79eef6387857faf41cdffa7be6b1f5d4efe builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

>> kernel/resource.c:990:12: error: static declaration of 'reparent_resources' follows non-static declaration
    static int reparent_resources(struct resource *parent,
               ^~~~~~~~~~~~~~~~~~
   In file included from kernel/resource.c:14:0:
   include/linux/ioport.h:195:5: note: previous declaration of 'reparent_resources' was here
    int reparent_resources(struct resource *parent, struct resource *res);
        ^~~~~~~~~~~~~~~~~~
   kernel/resource.c:990:12: warning: 'reparent_resources' defined but not used [-Wunused-function]
    static int reparent_resources(struct resource *parent,
               ^~~~~~~~~~~~~~~~~~

vim +/reparent_resources +990 kernel/resource.c

   985	
   986	/*
   987	 * Reparent resource children of pr that conflict with res
   988	 * under res, and make res replace those children.
   989	 */
 > 990	static int reparent_resources(struct resource *parent,
   991					     struct resource *res)
   992	{
   993		struct resource *p, **pp;
   994		struct resource **firstpp = NULL;
   995	
   996		for (pp = &parent->child; (p = *pp) != NULL; pp = &p->sibling) {
   997			if (p->end < res->start)
   998				continue;
   999			if (res->end < p->start)
  1000				break;
  1001			if (p->start < res->start || p->end > res->end)
  1002				return -1;	/* not completely contained */
  1003			if (firstpp == NULL)
  1004				firstpp = pp;
  1005		}
  1006		if (firstpp == NULL)
  1007			return -1;	/* didn't find any conflicting entries? */
  1008		res->parent = parent;
  1009		res->child = *firstpp;
  1010		res->sibling = *pp;
  1011		*firstpp = res;
  1012		*pp = NULL;
  1013		for (p = res->child; p != NULL; p = p->sibling) {
  1014			p->parent = res;
  1015			pr_debug("PCI: Reparented %s %pR under %s\n",
  1016				 p->name, p, res->name);
  1017		}
  1018		return 0;
  1019	}
  1020	EXPORT_SYMBOL(reparent_resources);
  1021	

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