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[PATCH 0/4] MIPS-kernel: Fine-tuning for two function implementations

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  [PATCH 0/4] MIPS-kernel: Fine-tuning for two function implementations SF Markus Elfring <elfring@users.sourceforge.net> - 2016-10-24 14:30 +0200
    [PATCH 2/4] MIPS/kernel/proc: Use seq_putc() in show_cpuinfo() SF Markus Elfring <elfring@users.sourceforge.net> - 2016-10-24 14:30 +0200
    [PATCH 3/4] MIPS/kernel/proc: Replace 28 seq_printf() calls by  seq_puts() in show_cpuinfo() SF Markus Elfring <elfring@users.sourceforge.net> - 2016-10-24 14:40 +0200
    [PATCH 4/4] MIPS/kernel/proc: Combine four seq_printf() calls into  one call in show_cpuinfo() SF Markus Elfring <elfring@users.sourceforge.net> - 2016-10-24 14:40 +0200
      Re: [PATCH 4/4] MIPS/kernel/proc: Combine four seq_printf() calls  into one call in show_cpuinfo() Geert Uytterhoeven <geert@linux-m68k.org> - 2016-10-25 11:00 +0200
        Re: [PATCH 4/4] MIPS/kernel/proc: Combine four seq_printf() calls  into one call in show_cpuinfo() Ralf Baechle <ralf@linux-mips.org> - 2016-10-25 11:10 +0200

#1507141 — [PATCH 0/4] MIPS-kernel: Fine-tuning for two function implementations

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Mon, 24 Oct 2016 14:05:14 +0200

A few update suggestions were taken into account
from static source code analysis.

Markus Elfring (4):
  r2-to-r6-emul: Use seq_puts() in mipsr2_stats_show()
  proc: Use seq_putc() in show_cpuinfo()
  proc: Replace 28 seq_printf() calls by seq_puts() in show_cpuinfo()
  proc: Combine four seq_printf() calls into one call in show_cpuinfo()

 arch/mips/kernel/mips-r2-to-r6-emul.c |  7 +--
 arch/mips/kernel/proc.c               | 95 ++++++++++++++++++++---------------
 2 files changed, 59 insertions(+), 43 deletions(-)

-- 
2.10.1

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#1507144 — [PATCH 2/4] MIPS/kernel/proc: Use seq_putc() in show_cpuinfo()

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Mon, 24 Oct 2016 12:54:15 +0200

A few single characters (line breaks) should be put into a sequence.
Thus use the corresponding function "seq_putc".

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 arch/mips/kernel/proc.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/mips/kernel/proc.c b/arch/mips/kernel/proc.c
index 4eff2ae..765489b 100644
--- a/arch/mips/kernel/proc.c
+++ b/arch/mips/kernel/proc.c
@@ -122,7 +122,7 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 	if (cpu_has_eva)	seq_printf(m, "%s", " eva");
 	if (cpu_has_htw)	seq_printf(m, "%s", " htw");
 	if (cpu_has_xpa)	seq_printf(m, "%s", " xpa");
-	seq_printf(m, "\n");
+	seq_putc(m, '\n');
 
 	if (cpu_has_mmips) {
 		seq_printf(m, "micromips kernel\t: %s\n",
@@ -152,9 +152,7 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 
 	raw_notifier_call_chain(&proc_cpuinfo_chain, 0,
 				&proc_cpuinfo_notifier_args);
-
-	seq_printf(m, "\n");
-
+	seq_putc(m, '\n');
 	return 0;
 }
 
-- 
2.10.1

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#1507151 — [PATCH 3/4] MIPS/kernel/proc: Replace 28 seq_printf() calls by seq_puts() in show_cpuinfo()

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Mon, 24 Oct 2016 13:45:04 +0200

Strings which did not contain data format specifications should be put
into a sequence.

* Thus use the corresponding function "seq_puts" so that the data output
  will be a bit more efficient.

* Omit the format string "%s" which became unnecessary with this refactoring.


This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 arch/mips/kernel/proc.c | 74 +++++++++++++++++++++++++++++--------------------
 1 file changed, 44 insertions(+), 30 deletions(-)

diff --git a/arch/mips/kernel/proc.c b/arch/mips/kernel/proc.c
index 765489b..07480a9 100644
--- a/arch/mips/kernel/proc.c
+++ b/arch/mips/kernel/proc.c
@@ -79,49 +79,63 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 		for (i = 0; i < cpu_data[n].watch_reg_count; i++)
 			seq_printf(m, "%s0x%04x", i ? ", " : "" ,
 				cpu_data[n].watch_reg_masks[i]);
-		seq_printf(m, "]\n");
+		seq_puts(m, "]\n");
 	}
 
-	seq_printf(m, "isa\t\t\t:"); 
+	seq_puts(m, "isa\t\t\t:");
 	if (cpu_has_mips_r1)
-		seq_printf(m, " mips1");
+		seq_puts(m, " mips1");
 	if (cpu_has_mips_2)
-		seq_printf(m, "%s", " mips2");
+		seq_puts(m, " mips2");
 	if (cpu_has_mips_3)
-		seq_printf(m, "%s", " mips3");
+		seq_puts(m, " mips3");
 	if (cpu_has_mips_4)
-		seq_printf(m, "%s", " mips4");
+		seq_puts(m, " mips4");
 	if (cpu_has_mips_5)
-		seq_printf(m, "%s", " mips5");
+		seq_puts(m, " mips5");
 	if (cpu_has_mips32r1)
-		seq_printf(m, "%s", " mips32r1");
+		seq_puts(m, " mips32r1");
 	if (cpu_has_mips32r2)
-		seq_printf(m, "%s", " mips32r2");
+		seq_puts(m, " mips32r2");
 	if (cpu_has_mips32r6)
-		seq_printf(m, "%s", " mips32r6");
+		seq_puts(m, " mips32r6");
 	if (cpu_has_mips64r1)
-		seq_printf(m, "%s", " mips64r1");
+		seq_puts(m, " mips64r1");
 	if (cpu_has_mips64r2)
-		seq_printf(m, "%s", " mips64r2");
+		seq_puts(m, " mips64r2");
 	if (cpu_has_mips64r6)
-		seq_printf(m, "%s", " mips64r6");
-	seq_printf(m, "\n");
-
-	seq_printf(m, "ASEs implemented\t:");
-	if (cpu_has_mips16)	seq_printf(m, "%s", " mips16");
-	if (cpu_has_mdmx)	seq_printf(m, "%s", " mdmx");
-	if (cpu_has_mips3d)	seq_printf(m, "%s", " mips3d");
-	if (cpu_has_smartmips)	seq_printf(m, "%s", " smartmips");
-	if (cpu_has_dsp)	seq_printf(m, "%s", " dsp");
-	if (cpu_has_dsp2)	seq_printf(m, "%s", " dsp2");
-	if (cpu_has_dsp3)	seq_printf(m, "%s", " dsp3");
-	if (cpu_has_mipsmt)	seq_printf(m, "%s", " mt");
-	if (cpu_has_mmips)	seq_printf(m, "%s", " micromips");
-	if (cpu_has_vz)		seq_printf(m, "%s", " vz");
-	if (cpu_has_msa)	seq_printf(m, "%s", " msa");
-	if (cpu_has_eva)	seq_printf(m, "%s", " eva");
-	if (cpu_has_htw)	seq_printf(m, "%s", " htw");
-	if (cpu_has_xpa)	seq_printf(m, "%s", " xpa");
+		seq_puts(m, " mips64r6");
+	seq_puts(m,
+		 "\n"
+		 "ASEs implemented\t:");
+	if (cpu_has_mips16)
+		seq_puts(m, " mips16");
+	if (cpu_has_mdmx)
+		seq_puts(m, " mdmx");
+	if (cpu_has_mips3d)
+		seq_puts(m, " mips3d");
+	if (cpu_has_smartmips)
+		seq_puts(m, " smartmips");
+	if (cpu_has_dsp)
+		seq_puts(m, " dsp");
+	if (cpu_has_dsp2)
+		seq_puts(m, " dsp2");
+	if (cpu_has_dsp3)
+		seq_puts(m, " dsp3");
+	if (cpu_has_mipsmt)
+		seq_puts(m, " mt");
+	if (cpu_has_mmips)
+		seq_puts(m, " micromips");
+	if (cpu_has_vz)
+		seq_puts(m, " vz");
+	if (cpu_has_msa)
+		seq_puts(m, " msa");
+	if (cpu_has_eva)
+		seq_puts(m, " eva");
+	if (cpu_has_htw)
+		seq_puts(m, " htw");
+	if (cpu_has_xpa)
+		seq_puts(m, " xpa");
 	seq_putc(m, '\n');
 
 	if (cpu_has_mmips) {
-- 
2.10.1

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#1507160 — [PATCH 4/4] MIPS/kernel/proc: Combine four seq_printf() calls into one call in show_cpuinfo()

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Mon, 24 Oct 2016 13:54:58 +0200

Some data were printed into a sequence by four separate function calls.
Print the same data by one function call instead.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 arch/mips/kernel/proc.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/arch/mips/kernel/proc.c b/arch/mips/kernel/proc.c
index 07480a9..1047a03 100644
--- a/arch/mips/kernel/proc.c
+++ b/arch/mips/kernel/proc.c
@@ -142,12 +142,15 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 		seq_printf(m, "micromips kernel\t: %s\n",
 		      (read_c0_config3() & MIPS_CONF3_ISA_OE) ?  "yes" : "no");
 	}
-	seq_printf(m, "shadow register sets\t: %d\n",
-		      cpu_data[n].srsets);
-	seq_printf(m, "kscratch registers\t: %d\n",
-		      hweight8(cpu_data[n].kscratch_mask));
-	seq_printf(m, "package\t\t\t: %d\n", cpu_data[n].package);
-	seq_printf(m, "core\t\t\t: %d\n", cpu_data[n].core);
+	seq_printf(m,
+		   "shadow register sets\t: %d\n"
+		   "kscratch registers\t: %d\n"
+		   "package\t\t\t: %d\n"
+		   "core\t\t\t: %d\n",
+		   cpu_data[n].srsets,
+		   hweight8(cpu_data[n].kscratch_mask),
+		   cpu_data[n].package,
+		   cpu_data[n].core);
 
 #if defined(CONFIG_MIPS_MT_SMP) || defined(CONFIG_CPU_MIPSR6)
 	if (cpu_has_mipsmt)
-- 
2.10.1

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#1508079 — Re: [PATCH 4/4] MIPS/kernel/proc: Combine four seq_printf() calls into one call in show_cpuinfo()

On Mon, Oct 24, 2016 at 2:30 PM, SF Markus Elfring
<elfring@users.sourceforge.net> wrote:
> From: Markus Elfring <elfring@users.sourceforge.net>
> Date: Mon, 24 Oct 2016 13:54:58 +0200
>
> Some data were printed into a sequence by four separate function calls.
> Print the same data by one function call instead.
>
> Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
> ---
>  arch/mips/kernel/proc.c | 15 +++++++++------
>  1 file changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/arch/mips/kernel/proc.c b/arch/mips/kernel/proc.c
> index 07480a9..1047a03 100644
> --- a/arch/mips/kernel/proc.c
> +++ b/arch/mips/kernel/proc.c
> @@ -142,12 +142,15 @@ static int show_cpuinfo(struct seq_file *m, void *v)
>                 seq_printf(m, "micromips kernel\t: %s\n",
>                       (read_c0_config3() & MIPS_CONF3_ISA_OE) ?  "yes" : "no");
>         }
> -       seq_printf(m, "shadow register sets\t: %d\n",
> -                     cpu_data[n].srsets);
> -       seq_printf(m, "kscratch registers\t: %d\n",
> -                     hweight8(cpu_data[n].kscratch_mask));
> -       seq_printf(m, "package\t\t\t: %d\n", cpu_data[n].package);
> -       seq_printf(m, "core\t\t\t: %d\n", cpu_data[n].core);
> +       seq_printf(m,
> +                  "shadow register sets\t: %d\n"
> +                  "kscratch registers\t: %d\n"
> +                  "package\t\t\t: %d\n"
> +                  "core\t\t\t: %d\n",
> +                  cpu_data[n].srsets,
> +                  hweight8(cpu_data[n].kscratch_mask),
> +                  cpu_data[n].package,
> +                  cpu_data[n].core);

I think the code is much easier to read with separate seq_printf()s for
each line printed.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

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#1508093 — Re: [PATCH 4/4] MIPS/kernel/proc: Combine four seq_printf() calls into one call in show_cpuinfo()

On Tue, Oct 25, 2016 at 10:55:42AM +0200, Geert Uytterhoeven wrote:

> > -       seq_printf(m, "shadow register sets\t: %d\n",
> > -                     cpu_data[n].srsets);
> > -       seq_printf(m, "kscratch registers\t: %d\n",
> > -                     hweight8(cpu_data[n].kscratch_mask));
> > -       seq_printf(m, "package\t\t\t: %d\n", cpu_data[n].package);
> > -       seq_printf(m, "core\t\t\t: %d\n", cpu_data[n].core);
> > +       seq_printf(m,
> > +                  "shadow register sets\t: %d\n"
> > +                  "kscratch registers\t: %d\n"
> > +                  "package\t\t\t: %d\n"
> > +                  "core\t\t\t: %d\n",
> > +                  cpu_data[n].srsets,
> > +                  hweight8(cpu_data[n].kscratch_mask),
> > +                  cpu_data[n].package,
> > +                  cpu_data[n].core);
> 
> I think the code is much easier to read with separate seq_printf()s for
> each line printed.

Which is why I originally implemented this as separate function calls.
Code size and performance are hardly an argument for /proc/cpuinfo.

  Ralf

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