ppc/pnv: Improve macro parenthesization

[Qemu-devel] [PATCH] ppc/pnv: Improve macro parenthesization

Posted by Eric Blake 6 years, 7 months ago

Although none of the existing macro call-sites were broken,
it's always better to write macros that properly parenthesize
arguments that can be complex expressions, so that the intended
order of operations is not broken.

Signed-off-by: Eric Blake <eblake@redhat.com>
---
 include/hw/ppc/pnv_xscom.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/hw/ppc/pnv_xscom.h b/include/hw/ppc/pnv_xscom.h
index 3757b2cab9..38077b4796 100644
--- a/include/hw/ppc/pnv_xscom.h
+++ b/include/hw/ppc/pnv_xscom.h
@@ -54,7 +54,7 @@ typedef struct PnvXScomInterfaceClass {
  *   PCB SLAVE   0x110Fxxxx
  */

-#define PNV_XSCOM_EX_CORE_BASE(base, i) (base | (((uint64_t)i) << 24))
+#define PNV_XSCOM_EX_CORE_BASE(base, i) ((base) | ((uint64_t)(i) << 24))
 #define PNV_XSCOM_EX_CORE_SIZE    0x100000

 #define PNV_XSCOM_LPC_BASE        0xb0020
-- 
2.13.5

Re: [Qemu-devel] [Qemu-ppc] [PATCH] ppc/pnv: Improve macro parenthesization

Posted by Cédric Le Goater 6 years, 7 months ago

On 09/19/2017 04:16 PM, Eric Blake wrote:
> Although none of the existing macro call-sites were broken,
> it's always better to write macros that properly parenthesize
> arguments that can be complex expressions, so that the intended
> order of operations is not broken.

yes.

> Signed-off-by: Eric Blake <eblake@redhat.com>

Reviewed-by: Cédric Le Goater <clg@kaod.org>

C.
> ---
>  include/hw/ppc/pnv_xscom.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/hw/ppc/pnv_xscom.h b/include/hw/ppc/pnv_xscom.h
> index 3757b2cab9..38077b4796 100644
> --- a/include/hw/ppc/pnv_xscom.h
> +++ b/include/hw/ppc/pnv_xscom.h
> @@ -54,7 +54,7 @@ typedef struct PnvXScomInterfaceClass {
>   *   PCB SLAVE   0x110Fxxxx
>   */
> 
> -#define PNV_XSCOM_EX_CORE_BASE(base, i) (base | (((uint64_t)i) << 24))
> +#define PNV_XSCOM_EX_CORE_BASE(base, i) ((base) | ((uint64_t)(i) << 24))
>  #define PNV_XSCOM_EX_CORE_SIZE    0x100000
> 
>  #define PNV_XSCOM_LPC_BASE        0xb0020
>

Re: [Qemu-devel] [PATCH] ppc/pnv: Improve macro parenthesization

Posted by David Gibson 6 years, 7 months ago

On Tue, Sep 19, 2017 at 09:16:03AM -0500, Eric Blake wrote:
> Although none of the existing macro call-sites were broken,
> it's always better to write macros that properly parenthesize
> arguments that can be complex expressions, so that the intended
> order of operations is not broken.
> 
> Signed-off-by: Eric Blake <eblake@redhat.com>

Applied to ppc-for-2.11, thanks.

> ---
>  include/hw/ppc/pnv_xscom.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/hw/ppc/pnv_xscom.h b/include/hw/ppc/pnv_xscom.h
> index 3757b2cab9..38077b4796 100644
> --- a/include/hw/ppc/pnv_xscom.h
> +++ b/include/hw/ppc/pnv_xscom.h
> @@ -54,7 +54,7 @@ typedef struct PnvXScomInterfaceClass {
>   *   PCB SLAVE   0x110Fxxxx
>   */
> 
> -#define PNV_XSCOM_EX_CORE_BASE(base, i) (base | (((uint64_t)i) << 24))
> +#define PNV_XSCOM_EX_CORE_BASE(base, i) ((base) | ((uint64_t)(i) << 24))
>  #define PNV_XSCOM_EX_CORE_SIZE    0x100000
> 
>  #define PNV_XSCOM_LPC_BASE        0xb0020

-- 
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david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson