linux-kernel - [PATCH 2/30] ACPI-processor: Improve two size determinations in acpi_processor_get_performance

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Date:   Sat, 10 Sep 2016 11:36:41 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linux-acpi@...r.kernel.org, Len Brown <lenb@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: [PATCH 2/30] ACPI-processor: Improve two size determinations in
 acpi_processor_get_performance_states()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Tue, 6 Sep 2016 11:11:12 +0200

Replace the specification of a data structure by pointer dereferences
as the parameter for the operator "sizeof" to make the corresponding size
determination a bit safer according to the Linux coding style convention.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/acpi/processor_perflib.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
index 78f9025..004e24c 100644
--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c
@@ -358,7 +358,7 @@ static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 
 		struct acpi_processor_px *px = &(pr->performance->states[i]);
 
-		state.length = sizeof(struct acpi_processor_px);
+		state.length = sizeof(*px);
 		state.pointer = px;
 
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
@@ -400,7 +400,8 @@ static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 				 * Copy this valid entry over last_invalid entry
 				 */
 				memcpy(&(pr->performance->states[last_invalid]),
-				       px, sizeof(struct acpi_processor_px));
+				       px,
+				       sizeof(*px));
 				++last_invalid;
 			}
 		}
-- 
2.10.0