Subject: Re: linux-next: manual merge of the char-misc tree with the driver-core tree

From: Nathan Chancellor <[email-masked]>
Date: Mon, 1 Jul 2019 11:39:40 -0700

On Mon, Jul 01, 2019 at 07:09:40PM +1000, Stephen Rothwell wrote:
> Hi all,
> 
> Today's linux-next merge of the char-misc tree got a conflict in:
> 
>   drivers/hwtracing/coresight/of_coresight.c
> 
> between commit:
> 
>   418e3ea157ef ("bus_find_device: Unify the match callback with class_find_device")
> 
> from the driver-core tree and commits:
> 
>   22aa495a6477 ("coresight: Rename of_coresight to coresight-platform")
>   20961aea982e ("coresight: platform: Use fwnode handle for device search")
> 
> from the char-misc tree.
> 
> I fixed it up (I removed the file and added the following merge fix patch)
> and can carry the fix as necessary. This is now fixed as far as linux-next
> is concerned, but any non trivial conflicts should be mentioned to your
> upstream maintainer when your tree is submitted for merging.  You may
> also want to consider cooperating with the maintainer of the conflicting
> tree to minimise any particularly complex conflicts.
> 
> From: Stephen Rothwell <[email-masked]>
> Date: Mon, 1 Jul 2019 19:07:20 +1000
> Subject: [PATCH] coresight: fix for "bus_find_device: Unify the match callback
>  with class_find_device"
> 
> Signed-off-by: Stephen Rothwell <[email-masked]>
> ---
>  drivers/hwtracing/coresight/coresight-platform.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
> index 3c5ceda8db24..fc67f6ae0b3e 100644
> --- a/drivers/hwtracing/coresight/coresight-platform.c
> +++ b/drivers/hwtracing/coresight/coresight-platform.c
> @@ -37,7 +37,7 @@ static int coresight_alloc_conns(struct device *dev,
>  	return 0;
>  }
>  
> -int coresight_device_fwnode_match(struct device *dev, void *fwnode)
> +int coresight_device_fwnode_match(struct device *dev, const void *fwnode)
>  {
>  	return dev_fwnode(dev) == fwnode;
>  }
> -- 
> 2.20.1
> 
> -- 
> Cheers,
> Stephen Rothwell

Hi Stephen,

The attached patch is needed in addition to this to avoid a build error
about incompatible pointer types (in the commit message).

Cheers,
Nathan
>From 2b2dd836a7370d9b33fb0f70515ecd7bc8462c0a Mon Sep 17 00:00:00 2001
From: Nathan Chancellor <[email-masked]>
Date: Mon, 1 Jul 2019 11:28:08 -0700
Subject: [PATCH] coresight: Make the coresight_device_fwnode_match
 declaration's fwnode parameter const

drivers/hwtracing/coresight/coresight.c:1051:11: error: incompatible
pointer types passing 'int (struct device *, void *)' to parameter of
type 'int (*)(struct device *, const void *)'
[-Werror,-Wincompatible-pointer-types]
                                      coresight_device_fwnode_match);
                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/device.h:173:17: note: passing argument to parameter 'match' here
                               int (*match)(struct device *dev, const void *data));
                                     ^
1 error generated.

Signed-off-by: Nathan Chancellor <[email-masked]>
---
 drivers/hwtracing/coresight/coresight-priv.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
index 8b07fe55395a..7d401790dd7e 100644
--- a/drivers/hwtracing/coresight/coresight-priv.h
+++ b/drivers/hwtracing/coresight/coresight-priv.h
@@ -202,6 +202,6 @@ static inline void *coresight_get_uci_data(const struct amba_id *id)
 
 void coresight_release_platform_data(struct coresight_platform_data *pdata);
 
-int coresight_device_fwnode_match(struct device *dev, void *fwnode);
+int coresight_device_fwnode_match(struct device *dev, const void *fwnode);
 
 #endif
-- 
2.22.0