linux-kernel - Re: [PATCH] libnvdimm/nfit_test: Fix acpi

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Date:   Wed, 18 Sep 2019 14:45:07 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Keith Busch <keith.busch@...el.com>,
        Jason Gunthorpe <jgg@...lanox.com>, linux-nvdimm@...ts.01.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH] libnvdimm/nfit_test: Fix acpi_handle redefinition

On Tue, Sep 17, 2019 at 09:21:49PM -0700, Nathan Chancellor wrote:
> After commit 62974fc389b3 ("libnvdimm: Enable unit test infrastructure
> compile checks"), clang warns:
> 
> In file included from
> ../drivers/nvdimm/../../tools/testing/nvdimm/test/iomap.c:15:
> ../drivers/nvdimm/../../tools/testing/nvdimm/test/nfit_test.h:206:15:
> warning: redefinition of typedef 'acpi_handle' is a C11 feature
> [-Wtypedef-redefinition]
> typedef void *acpi_handle;
>               ^
> ../include/acpi/actypes.h:424:15: note: previous definition is here
> typedef void *acpi_handle;      /* Actually a ptr to a NS Node */
>               ^
> 1 warning generated.
> 
> The include chain:
> 
> iomap.c ->
>     linux/acpi.h ->
>         acpi/acpi.h ->
>             acpi/actypes.h
>     nfit_test.h
> 
> Avoid this by including linux/acpi.h in nfit_test.h, which allows us to
> remove both the typedef and the forward declaration of acpi_object.
> 
> Link: https://github.com/ClangBuiltLinux/linux/issues/660
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>

Reviewed-by: Ira Weiny <ira.weiny@...el.com>

> ---
> 
> I know that every maintainer has their own thing with the number of
> includes in each header file; this issue can be solved in a various
> number of ways, I went with the smallest diff stat. Please solve it in a
> different way if you see fit :)
> 
>  tools/testing/nvdimm/test/nfit_test.h | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/tools/testing/nvdimm/test/nfit_test.h b/tools/testing/nvdimm/test/nfit_test.h
> index 448d686da8b1..0bf5640f1f07 100644
> --- a/tools/testing/nvdimm/test/nfit_test.h
> +++ b/tools/testing/nvdimm/test/nfit_test.h
> @@ -4,6 +4,7 @@
>   */
>  #ifndef __NFIT_TEST_H__
>  #define __NFIT_TEST_H__
> +#include <linux/acpi.h>
>  #include <linux/list.h>
>  #include <linux/uuid.h>
>  #include <linux/ioport.h>
> @@ -202,9 +203,6 @@ struct nd_intel_lss {
>  	__u32 status;
>  } __packed;
>  
> -union acpi_object;
> -typedef void *acpi_handle;
> -
>  typedef struct nfit_test_resource *(*nfit_test_lookup_fn)(resource_size_t);
>  typedef union acpi_object *(*nfit_test_evaluate_dsm_fn)(acpi_handle handle,
>  		 const guid_t *guid, u64 rev, u64 func,
> -- 
> 2.23.0
>