linux-kernel - [tip:x86/cache] x86/resctrl: Use rdt_last_cmd

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Date:   Tue, 27 Nov 2018 11:48:55 -0800
From:   tip-bot for Reinette Chatre <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     fenghua.yu@...el.com, mingo@...hat.com, hpa@...or.com,
        tglx@...utronix.de, x86@...nel.org, mingo@...nel.org,
        linux-kernel@...r.kernel.org, tony.luck@...el.com, bp@...e.de,
        reinette.chatre@...el.com
Subject: [tip:x86/cache] x86/resctrl: Use rdt_last_cmd_puts() where possible

Commit-ID:  456824896de2b68df40b3ea5777ef49dc6cc8fda
Gitweb:     https://git.kernel.org/tip/456824896de2b68df40b3ea5777ef49dc6cc8fda
Author:     Reinette Chatre <reinette.chatre@...el.com>
AuthorDate: Tue, 27 Nov 2018 11:19:36 -0800
Committer:  Borislav Petkov <bp@...e.de>
CommitDate: Tue, 27 Nov 2018 20:39:02 +0100

x86/resctrl: Use rdt_last_cmd_puts() where possible

The last_cmd_status sequence buffer contains user-visible messages
(accessed via /sys/fs/resctrl/info/last_cmd_status) that detail any
errors encountered while interacting with the resctrl filesystem.

rdt_last_cmd_printf() and rdt_last_cmd_puts() are the two calls
available to respectively print a string with format specifiers or a
simple one (which contains no format specifiers) to the last_cmd_status
buffer.

A few occurrences exist where rdt_last_cmd_printf() is used to print
a simple string. Doing so does not result in incorrect result or
incorrect behavior, but rdt_last_cmd_puts() is the function intended to
be used in these cases, as it is faster and it doesn't need to do the
vsnprintf() formatting.

Fix these occurrences to use rdt_last_cmd_puts() instead. While doing
so, fix two typos that were recently introduced into two of these simple
strings.

 [ bp: massage commit message and correct typos. ]

Fixes: 723f1a0dd8e2 ("x86/resctrl: Fixup the user-visible strings")
Fixes: e0bdfe8e36f3 ("x86/intel_rdt: Support creation/removal of pseudo-locked region")
Fixes: 9ab9aa15c309 ("x86/intel_rdt: Ensure requested schemata respects mode")
Fixes: d48d7a57f718 ("x86/intel_rdt: Introduce resource group's mode resctrl file")
Fixes: dfe9674b04ff ("x86/intel_rdt: Enable entering of pseudo-locksetup mode")
Signed-off-by: Reinette Chatre <reinette.chatre@...el.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Tony Luck <tony.luck@...el.com>
Cc: babu.moger@....com
Cc: jithu.joseph@...el.com
Cc: x86-ml <x86@...nel.org>
Link: https://lkml.kernel.org/r/f48e46a016d6a5c79f13de8faeca382052189e2e.1543346009.git.reinette.chatre@intel.com
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 8 ++++----
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 4 ++--
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 43ee3cee6494..03ee13235a45 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -215,7 +215,7 @@ int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
 	 */
 	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
 	    rdtgroup_pseudo_locked_in_hierarchy(d)) {
-		rdt_last_cmd_printf("Pseudo-locked region in hierarchy\n");
+		rdt_last_cmd_puts("Pseudo-locked region in hierarchy\n");
 		return -EINVAL;
 	}
 
@@ -225,7 +225,7 @@ int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
 	if ((rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
 	     rdtgrp->mode == RDT_MODE_SHAREABLE) &&
 	    rdtgroup_cbm_overlaps_pseudo_locked(d, cbm_val)) {
-		rdt_last_cmd_printf("CBM overlaps with pseudo-locked region\n");
+		rdt_last_cmd_puts("CBM overlaps with pseudo-locked region\n");
 		return -EINVAL;
 	}
 
@@ -234,14 +234,14 @@ int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
 	 * either is exclusive.
 	 */
 	if (rdtgroup_cbm_overlaps(r, d, cbm_val, rdtgrp->closid, true)) {
-		rdt_last_cmd_printf("Overlaps with exclusive group\n");
+		rdt_last_cmd_puts("Overlaps with exclusive group\n");
 		return -EINVAL;
 	}
 
 	if (rdtgroup_cbm_overlaps(r, d, cbm_val, rdtgrp->closid, false)) {
 		if (rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
 		    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
-			rdt_last_cmd_printf("0verlaps with other group\n");
+			rdt_last_cmd_puts("Overlaps with other group\n");
 			return -EINVAL;
 		}
 	}
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 61b102dd51a5..017505017bdb 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1206,7 +1206,7 @@ static ssize_t rdtgroup_mode_write(struct kernfs_open_file *of,
 		goto out;
 
 	if (mode == RDT_MODE_PSEUDO_LOCKED) {
-		rdt_last_cmd_printf("Cannot change pseudo-locked group\n");
+		rdt_last_cmd_puts("Cannot change pseudo-locked group\n");
 		ret = -EINVAL;
 		goto out;
 	}
@@ -1235,7 +1235,7 @@ static ssize_t rdtgroup_mode_write(struct kernfs_open_file *of,
 			goto out;
 		rdtgrp->mode = RDT_MODE_PSEUDO_LOCKSETUP;
 	} else {
-		rdt_last_cmd_printf("Unknown orunsupported mode\n");
+		rdt_last_cmd_puts("Unknown or unsupported mode\n");
 		ret = -EINVAL;
 	}