linux-kernel - Re: [PATCH] IB/uverbs: Add missing braces in anonymous union initializers

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Date:   Tue, 17 Apr 2018 20:17:41 -0600
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Doug Ledford <dledford@...hat.com>,
        Matan Barak <matanb@...lanox.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] IB/uverbs: Add missing braces in anonymous union
 initializers

On Mon, Apr 09, 2018 at 04:52:47PM +0200, Geert Uytterhoeven wrote:
> With gcc-4.1.2:
> 
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:366: error: unknown field ‘ptr’ specified in initializer
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:367: error: unknown field ‘type’ specified in initializer
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:367: warning: missing braces around initializer
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:367: warning: (near initialization for ‘uverbs_flow_action_esp_keymat[0].<anonymous>.<anonymous>’)
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:368: error: unknown field ‘min_len’ specified in initializer
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:368: warning: excess elements in union initializer
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:368: warning: (near initialization for ‘uverbs_flow_action_esp_keymat[0].<anonymous>’)
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:368: error: unknown field ‘len’ specified in initializer
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:368: warning: excess elements in union initializer
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:368: warning: (near initialization for ‘uverbs_flow_action_esp_keymat[0].<anonymous>’)
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:369: error: unknown field ‘flags’ specified in initializer
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:369: warning: excess elements in union initializer
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:369: warning: (near initialization for ‘uverbs_flow_action_esp_keymat[0].<anonymous>’)
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:376: error: unknown field ‘ptr’ specified in initializer
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:377: error: unknown field ‘type’ specified in initializer
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:377: warning: missing braces around initializer
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:377: warning: (near initialization for ‘uverbs_flow_action_esp_replay[0].<anonymous>.<anonymous>’)
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:379: error: unknown field ‘len’ specified in initializer
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:379: warning: excess elements in union initializer
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:379: warning: (near initialization for ‘uverbs_flow_action_esp_replay[0].<anonymous>’)
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:383: error: unknown field ‘ptr’ specified in initializer
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:384: error: unknown field ‘type’ specified in initializer
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:385: error: unknown field ‘min_len’ specified in initializer
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:385: warning: excess elements in union initializer
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:385: warning: (near initialization for ‘uverbs_flow_action_esp_replay[1].<anonymous>’)
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:385: error: unknown field ‘len’ specified in initializer
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:385: warning: excess elements in union initializer
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:385: warning: (near initialization for ‘uverbs_flow_action_esp_replay[1].<anonymous>’)
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:386: error: unknown field ‘flags’ specified in initializer
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:386: warning: excess elements in union initializer
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:386: warning: (near initialization for ‘uverbs_flow_action_esp_replay[1].<anonymous>’)
> 
> Add the missing braces to fix this.
> 
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> ---
> Presumably also needed for Andrew's gcc-4.4.4.
> 
> Unfortunately I don't know how to fix the remaining warnings:
> 
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:391: warning: initialization from incompatible pointer type
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:408: warning: initialization from incompatible pointer type
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:423: warning: initialization from incompatible pointer type
>     drivers/infiniband/core/uverbs_std_types_flow_action.c:430: warning: initialization from incompatible pointer type
>     drivers/infiniband/core/uverbs_std_types_cq.c:149: warning: initialization from incompatible pointer type
>     drivers/infiniband/core/uverbs_std_types_cq.c:194: warning: initialization from incompatible pointer type
>     drivers/infiniband/core/uverbs_std_types_cq.c:202: warning: initialization from incompatible pointer type
>     drivers/infiniband/core/uverbs_std_types_dm.c:86: warning: initialization from incompatible pointer type
>     drivers/infiniband/core/uverbs_std_types_dm.c:97: warning: initialization from incompatible pointer type
>     drivers/infiniband/core/uverbs_std_types_dm.c:104: warning: initialization from incompatible pointer type
>     drivers/infiniband/core/uverbs_std_types_mr.c:118: warning: initialization from incompatible pointer type
>     drivers/infiniband/core/uverbs_std_types_mr.c:144: warning: initialization from incompatible pointer type
> 
> Smallest variable declaration exposing the problem:
> 
>     static const struct uverbs_method_def bad = {
> 	    .attrs = &(const struct uverbs_attr_def * const []) { }
>     };
> ---
>  drivers/infiniband/core/uverbs_std_types_flow_action.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)

I've applied this to for-rc, thanks

I have a notion on how to fix the warnings, maybe you will see that in
4.18..

Jason