linux-kernel - Re: [PATCH] powerpc/xmon/ppc-opc: Use ARRAY

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Date:   Mon, 08 Oct 2018 19:27:28 -0700
From:   Joe Perches <joe@...ches.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/xmon/ppc-opc: Use ARRAY_SIZE macro

On Thu, 2018-10-04 at 19:10 +0200, Gustavo A. R. Silva wrote:
> Use ARRAY_SIZE instead of dividing sizeof array with sizeof an element.
[]
> diff --git a/arch/powerpc/xmon/ppc-opc.c b/arch/powerpc/xmon/ppc-opc.c
[]
> @@ -966,8 +966,7 @@ const struct powerpc_operand powerpc_operands[] =
>    { 0xff, 11, NULL, NULL, PPC_OPERAND_SIGNOPT },
>  };
>  
> -const unsigned int num_powerpc_operands = (sizeof (powerpc_operands)
> -					   / sizeof (powerpc_operands[0]));
> +const unsigned int num_powerpc_operands = ARRAY_SIZE(powerpc_operands);

It seems this is unused and could be deleted.

>  /* The functions used to insert and extract complicated operands.  */
>  
> @@ -6980,8 +6979,7 @@ const struct powerpc_opcode powerpc_opcodes[] = {
>  {"fcfidu.",	XRC(63,974,1),	XRA_MASK, POWER7|PPCA2,	PPCVLE,		{FRT, FRB}},
>  };
>  
> -const int powerpc_num_opcodes =
> -  sizeof (powerpc_opcodes) / sizeof (powerpc_opcodes[0]);
> +const int powerpc_num_opcodes = ARRAY_SIZE(powerpc_opcodes);

This is used once and should probably be replaced where
it is used with ARRAY_SIZE

>  /* The VLE opcode table.
>  
> @@ -7219,8 +7217,7 @@ const struct powerpc_opcode vle_opcodes[] = {
>  {"se_bl",	BD8(58,0,1),	BD8_MASK,	PPCVLE,	0,		{B8}},
>  };
>  
> -const int vle_num_opcodes =
> -  sizeof (vle_opcodes) / sizeof (vle_opcodes[0]);
> +const int vle_num_opcodes = ARRAY_SIZE(vle_opcodes);

Also apparently unused and could be deleted.

>  
>  /* The macro table.  This is only used by the assembler.  */
>  
> @@ -7288,5 +7285,4 @@ const struct powerpc_macro powerpc_macros[] = {
>  {"e_clrlslwi",4, PPCVLE, "e_rlwinm %0,%1,%3,(%2)-(%3),31-(%3)"},
>  };
>  ld
> -const int powerpc_num_macros =
> -  sizeof (powerpc_macros) / sizeof (powerpc_macros[0]);
> +const int powerpc_num_macros = ARRAY_SIZE(powerpc_macros);

Also apparently unused and could be deleted.