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Date:	Mon, 23 Feb 2015 12:39:37 +0100
From:	Michal Simek <monstr@...str.eu>
To:	Joe Perches <joe@...ches.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/27] microblaze: mb: Remove use of seq_printf return
 value

Hi Joe,

On 02/22/2015 03:53 AM, Joe Perches wrote:
> The seq_printf return value, because it's frequently misused,
> will eventually be converted to void.
> 
> See: commit 1f33c41c03da ("seq_file: Rename seq_overflow() to
>      seq_has_overflowed() and make public")
> 
> Signed-off-by: Joe Perches <joe@...ches.com>
> ---
>  arch/microblaze/kernel/cpu/mb.c | 149 ++++++++++++++++++++--------------------
>  1 file changed, 73 insertions(+), 76 deletions(-)
> 
> diff --git a/arch/microblaze/kernel/cpu/mb.c b/arch/microblaze/kernel/cpu/mb.c
> index 7b5dca7..01ae077 100644
> --- a/arch/microblaze/kernel/cpu/mb.c
> +++ b/arch/microblaze/kernel/cpu/mb.c
> @@ -27,7 +27,6 @@
>  
>  static int show_cpuinfo(struct seq_file *m, void *v)
>  {
> -	int count = 0;
>  	char *fpga_family = "Unknown";
>  	char *cpu_ver = "Unknown";
>  	int i;
> @@ -48,91 +47,89 @@ static int show_cpuinfo(struct seq_file *m, void *v)
>  		}
>  	}
>  
> -	count = seq_printf(m,
> -			"CPU-Family:	MicroBlaze\n"
> -			"FPGA-Arch:	%s\n"
> -			"CPU-Ver:	%s, %s endian\n"
> -			"CPU-MHz:	%d.%02d\n"
> -			"BogoMips:	%lu.%02lu\n",
> -			fpga_family,
> -			cpu_ver,
> -			cpuinfo.endian ? "little" : "big",
> -			cpuinfo.cpu_clock_freq /
> -			1000000,
> -			cpuinfo.cpu_clock_freq %
> -			1000000,
> -			loops_per_jiffy / (500000 / HZ),
> -			(loops_per_jiffy / (5000 / HZ)) % 100);
> -
> -	count += seq_printf(m,
> -		"HW:\n Shift:\t\t%s\n"
> -		" MSR:\t\t%s\n"
> -		" PCMP:\t\t%s\n"
> -		" DIV:\t\t%s\n",
> -		(cpuinfo.use_instr & PVR0_USE_BARREL_MASK) ? "yes" : "no",
> -		(cpuinfo.use_instr & PVR2_USE_MSR_INSTR) ? "yes" : "no",
> -		(cpuinfo.use_instr & PVR2_USE_PCMP_INSTR) ? "yes" : "no",
> -		(cpuinfo.use_instr & PVR0_USE_DIV_MASK) ? "yes" : "no");
> -
> -	count += seq_printf(m,
> -			" MMU:\t\t%x\n",
> -			cpuinfo.mmu);
> -
> -	count += seq_printf(m,
> -		" MUL:\t\t%s\n"
> -		" FPU:\t\t%s\n",
> -		(cpuinfo.use_mult & PVR2_USE_MUL64_MASK) ? "v2" :
> -			(cpuinfo.use_mult & PVR0_USE_HW_MUL_MASK) ? "v1" : "no",
> -		(cpuinfo.use_fpu & PVR2_USE_FPU2_MASK) ? "v2" :
> -			(cpuinfo.use_fpu & PVR0_USE_FPU_MASK) ? "v1" : "no");
> -
> -	count += seq_printf(m,
> -		" Exc:\t\t%s%s%s%s%s%s%s%s\n",
> -		(cpuinfo.use_exc & PVR2_OPCODE_0x0_ILL_MASK) ? "op0x0 " : "",
> -		(cpuinfo.use_exc & PVR2_UNALIGNED_EXC_MASK) ? "unal " : "",
> -		(cpuinfo.use_exc & PVR2_ILL_OPCODE_EXC_MASK) ? "ill " : "",
> -		(cpuinfo.use_exc & PVR2_IOPB_BUS_EXC_MASK) ? "iopb " : "",
> -		(cpuinfo.use_exc & PVR2_DOPB_BUS_EXC_MASK) ? "dopb " : "",
> -		(cpuinfo.use_exc & PVR2_DIV_ZERO_EXC_MASK) ? "zero " : "",
> -		(cpuinfo.use_exc & PVR2_FPU_EXC_MASK) ? "fpu " : "",
> -		(cpuinfo.use_exc & PVR2_USE_FSL_EXC) ? "fsl " : "");
> -
> -	count += seq_printf(m,
> -			"Stream-insns:\t%sprivileged\n",
> -			cpuinfo.mmu_privins ? "un" : "");
> +	seq_printf(m,
> +		   "CPU-Family:	MicroBlaze\n"
> +		   "FPGA-Arch:	%s\n"
> +		   "CPU-Ver:	%s, %s endian\n"
> +		   "CPU-MHz:	%d.%02d\n"
> +		   "BogoMips:	%lu.%02lu\n",
> +		   fpga_family,
> +		   cpu_ver,
> +		   cpuinfo.endian ? "little" : "big",
> +		   cpuinfo.cpu_clock_freq / 1000000,
> +		   cpuinfo.cpu_clock_freq % 1000000,
> +		   loops_per_jiffy / (500000 / HZ),
> +		   (loops_per_jiffy / (5000 / HZ)) % 100);
> +
> +	seq_printf(m,
> +		   "HW:\n Shift:\t\t%s\n"
> +		   " MSR:\t\t%s\n"
> +		   " PCMP:\t\t%s\n"
> +		   " DIV:\t\t%s\n",
> +		   (cpuinfo.use_instr & PVR0_USE_BARREL_MASK) ? "yes" : "no",
> +		   (cpuinfo.use_instr & PVR2_USE_MSR_INSTR) ? "yes" : "no",
> +		   (cpuinfo.use_instr & PVR2_USE_PCMP_INSTR) ? "yes" : "no",
> +		   (cpuinfo.use_instr & PVR0_USE_DIV_MASK) ? "yes" : "no");
> +
> +	seq_printf(m, " MMU:\t\t%x\n", cpuinfo.mmu);
> +
> +	seq_printf(m,
> +		   " MUL:\t\t%s\n"
> +		   " FPU:\t\t%s\n",
> +		   (cpuinfo.use_mult & PVR2_USE_MUL64_MASK) ? "v2" :
> +		   (cpuinfo.use_mult & PVR0_USE_HW_MUL_MASK) ? "v1" : "no",
> +		   (cpuinfo.use_fpu & PVR2_USE_FPU2_MASK) ? "v2" :
> +		   (cpuinfo.use_fpu & PVR0_USE_FPU_MASK) ? "v1" : "no");
> +
> +	seq_printf(m,
> +		   " Exc:\t\t%s%s%s%s%s%s%s%s\n",
> +		   (cpuinfo.use_exc & PVR2_OPCODE_0x0_ILL_MASK) ? "op0x0 " : "",
> +		   (cpuinfo.use_exc & PVR2_UNALIGNED_EXC_MASK) ? "unal " : "",
> +		   (cpuinfo.use_exc & PVR2_ILL_OPCODE_EXC_MASK) ? "ill " : "",
> +		   (cpuinfo.use_exc & PVR2_IOPB_BUS_EXC_MASK) ? "iopb " : "",
> +		   (cpuinfo.use_exc & PVR2_DOPB_BUS_EXC_MASK) ? "dopb " : "",
> +		   (cpuinfo.use_exc & PVR2_DIV_ZERO_EXC_MASK) ? "zero " : "",
> +		   (cpuinfo.use_exc & PVR2_FPU_EXC_MASK) ? "fpu " : "",
> +		   (cpuinfo.use_exc & PVR2_USE_FSL_EXC) ? "fsl " : "");
> +
> +	seq_printf(m,
> +		   "Stream-insns:\t%sprivileged\n",
> +		   cpuinfo.mmu_privins ? "un" : "");
>  
>  	if (cpuinfo.use_icache)
> -		count += seq_printf(m,
> -				"Icache:\t\t%ukB\tline length:\t%dB\n",
> -				cpuinfo.icache_size >> 10,
> -				cpuinfo.icache_line_length);
> +		seq_printf(m,
> +			   "Icache:\t\t%ukB\tline length:\t%dB\n",
> +			   cpuinfo.icache_size >> 10,
> +			   cpuinfo.icache_line_length);
>  	else
> -		count += seq_printf(m, "Icache:\t\tno\n");
> +	x	seq_puts(m, "Icache:\t\tno\n");
>  
>  	if (cpuinfo.use_dcache) {
> -		count += seq_printf(m,
> -				"Dcache:\t\t%ukB\tline length:\t%dB\n",
> -				cpuinfo.dcache_size >> 10,
> -				cpuinfo.dcache_line_length);
> -		seq_printf(m, "Dcache-Policy:\t");
> +		seq_printf(m,
> +			   "Dcache:\t\t%ukB\tline length:\t%dB\n",
> +			   cpuinfo.dcache_size >> 10,
> +			   cpuinfo.dcache_line_length);
> +		seq_puts(m, "Dcache-Policy:\t");
>  		if (cpuinfo.dcache_wb)
> -			count += seq_printf(m, "write-back\n");
> +			seq_puts(m, "write-back\n");
>  		else
> -			count += seq_printf(m, "write-through\n");
> -	} else
> -		count += seq_printf(m, "Dcache:\t\tno\n");
> +			seq_puts(m, "write-through\n");
> +	} else {
> +		seq_puts(m, "Dcache:\t\tno\n");
> +	}
> +
> +	seq_printf(m,
> +		   "HW-Debug:\t%s\n",
> +		   cpuinfo.hw_debug ? "yes" : "no");
>  
> -	count += seq_printf(m,
> -			"HW-Debug:\t%s\n",
> -			cpuinfo.hw_debug ? "yes" : "no");
> +	seq_printf(m,
> +		   "PVR-USR1:\t%02x\n"
> +		   "PVR-USR2:\t%08x\n",
> +		   cpuinfo.pvr_user1,
> +		   cpuinfo.pvr_user2);
>  
> -	count += seq_printf(m,
> -			"PVR-USR1:\t%02x\n"
> -			"PVR-USR2:\t%08x\n",
> -			cpuinfo.pvr_user1,
> -			cpuinfo.pvr_user2);
> +	seq_printf(m, "Page size:\t%lu\n", PAGE_SIZE);
>  
> -	count += seq_printf(m, "Page size:\t%lu\n", PAGE_SIZE);
>  	return 0;
>  }

Acked-by: Michal Simek <monstr@...str.eu>

Do you want to add it to microblaze next branch?

Thanks,
Michal

-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform



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