Subject: Re: linux-next: build failure after merge of the pci tree

From: Keith Busch <[email-masked]>
Date: Wed, 26 Sep 2018 08:25:40 -0600

On Wed, Sep 26, 2018 at 03:00:51PM +1000, Stephen Rothwell wrote:
> Hi Bjorn,
> 
> After merging the pci tree, today's linux-next build (powerpc allnoconfig)
> failed like this:
> 
> ld: drivers/pci/pci.o: in function `pci_bus_error_reset':
> pci.c:(.text+0x5fba): undefined reference to `pci_slot_mutex'
> ld: pci.c:(.text+0x5fc2): undefined reference to `pci_slot_mutex'
> 
> Caused by commit
> 
>   131b0ca2c7b2 ("PCI/ERR: Use slot reset if available")
> 
> I have applied the following hack for today (there is probably a better
> way):

Thanks for the notice. Does this mean you don't have CONFIG_SYSFS? I
must admit I missed that connection for building slot.c.

> From: Stephen Rothwell <[email-masked]>
> Date: Wed, 26 Sep 2018 14:55:37 +1000
> Subject: [PATCH] pci: move pci_slot_mutex so it is available where needed
> 
> Fixes: 131b0ca2c7b2 ("PCI/ERR: Use slot reset if available")
> Signed-off-by: Stephen Rothwell <[email-masked]>
> ---
>  drivers/pci/pci.c  | 2 ++
>  drivers/pci/slot.c | 1 -
>  2 files changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 8c1e99a637d8..1fa67db6b21e 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -5190,6 +5190,8 @@ static int pci_bus_reset(struct pci_bus *bus, int probe)
>  	return ret;
>  }
>  
> +DEFINE_MUTEX(pci_slot_mutex);
> +
>  /**
>   * pci_bus_error_reset - reset the bridge's subordinate bus
>   * @bridge: The parent device that connects to the bus to reset
> diff --git a/drivers/pci/slot.c b/drivers/pci/slot.c
> index 3da03fcc6fbf..c46d5e1ff536 100644
> --- a/drivers/pci/slot.c
> +++ b/drivers/pci/slot.c
> @@ -14,7 +14,6 @@
>  
>  struct kset *pci_slots_kset;
>  EXPORT_SYMBOL_GPL(pci_slots_kset);
> -DEFINE_MUTEX(pci_slot_mutex);
>  
>  static ssize_t pci_slot_attr_show(struct kobject *kobj,
>  					struct attribute *attr, char *buf)
> -- 
> 2.18.0