* [PATCH v2] module: Fix selfAssignment cppcheck warning
@ 2022-06-12 15:21 Christophe Leroy
2022-07-01 21:45 ` Luis Chamberlain
0 siblings, 1 reply; 2+ messages in thread
From: Christophe Leroy @ 2022-06-12 15:21 UTC (permalink / raw)
To: Luis Chamberlain, linux-modules
Cc: Christophe Leroy, linux-kernel, kernel test robot
cppcheck reports the following warnings:
kernel/module/main.c:1455:26: warning: Redundant assignment of 'mod->core_layout.size' to itself. [selfAssignment]
mod->core_layout.size = strict_align(mod->core_layout.size);
^
kernel/module/main.c:1489:26: warning: Redundant assignment of 'mod->init_layout.size' to itself. [selfAssignment]
mod->init_layout.size = strict_align(mod->init_layout.size);
^
kernel/module/main.c:1493:26: warning: Redundant assignment of 'mod->init_layout.size' to itself. [selfAssignment]
mod->init_layout.size = strict_align(mod->init_layout.size);
^
kernel/module/main.c:1504:26: warning: Redundant assignment of 'mod->init_layout.size' to itself. [selfAssignment]
mod->init_layout.size = strict_align(mod->init_layout.size);
^
kernel/module/main.c:1459:26: warning: Redundant assignment of 'mod->data_layout.size' to itself. [selfAssignment]
mod->data_layout.size = strict_align(mod->data_layout.size);
^
kernel/module/main.c:1463:26: warning: Redundant assignment of 'mod->data_layout.size' to itself. [selfAssignment]
mod->data_layout.size = strict_align(mod->data_layout.size);
^
kernel/module/main.c:1467:26: warning: Redundant assignment of 'mod->data_layout.size' to itself. [selfAssignment]
mod->data_layout.size = strict_align(mod->data_layout.size);
^
This is due to strict_align() being a no-op when
CONFIG_STRICT_MODULE_RWX is not selected.
Transform strict_align() macro into an inline function. It will
allow type checking and avoid the selfAssignment warning.
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
kernel/module/internal.h | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/kernel/module/internal.h b/kernel/module/internal.h
index bc5507ab8450..ec104c2950c3 100644
--- a/kernel/module/internal.h
+++ b/kernel/module/internal.h
@@ -11,6 +11,7 @@
#include <linux/mutex.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
+#include <linux/mm.h>
#ifndef ARCH_SHF_SMALL
#define ARCH_SHF_SMALL 0
@@ -30,11 +31,13 @@
* to ensure complete separation of code and data, but
* only when CONFIG_STRICT_MODULE_RWX=y
*/
-#ifdef CONFIG_STRICT_MODULE_RWX
-# define strict_align(X) PAGE_ALIGN(X)
-#else
-# define strict_align(X) (X)
-#endif
+static inline unsigned int strict_align(unsigned int size)
+{
+ if (IS_ENABLED(CONFIG_STRICT_MODULE_RWX))
+ return PAGE_ALIGN(size);
+ else
+ return size;
+}
extern struct mutex module_mutex;
extern struct list_head modules;
--
2.35.3
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v2] module: Fix selfAssignment cppcheck warning
2022-06-12 15:21 [PATCH v2] module: Fix selfAssignment cppcheck warning Christophe Leroy
@ 2022-07-01 21:45 ` Luis Chamberlain
0 siblings, 0 replies; 2+ messages in thread
From: Luis Chamberlain @ 2022-07-01 21:45 UTC (permalink / raw)
To: Christophe Leroy; +Cc: linux-modules, linux-kernel, kernel test robot
On Sun, Jun 12, 2022 at 05:21:56PM +0200, Christophe Leroy wrote:
> cppcheck reports the following warnings:
>
> kernel/module/main.c:1455:26: warning: Redundant assignment of 'mod->core_layout.size' to itself. [selfAssignment]
> mod->core_layout.size = strict_align(mod->core_layout.size);
> ^
> kernel/module/main.c:1489:26: warning: Redundant assignment of 'mod->init_layout.size' to itself. [selfAssignment]
> mod->init_layout.size = strict_align(mod->init_layout.size);
> ^
> kernel/module/main.c:1493:26: warning: Redundant assignment of 'mod->init_layout.size' to itself. [selfAssignment]
> mod->init_layout.size = strict_align(mod->init_layout.size);
> ^
> kernel/module/main.c:1504:26: warning: Redundant assignment of 'mod->init_layout.size' to itself. [selfAssignment]
> mod->init_layout.size = strict_align(mod->init_layout.size);
> ^
> kernel/module/main.c:1459:26: warning: Redundant assignment of 'mod->data_layout.size' to itself. [selfAssignment]
> mod->data_layout.size = strict_align(mod->data_layout.size);
> ^
> kernel/module/main.c:1463:26: warning: Redundant assignment of 'mod->data_layout.size' to itself. [selfAssignment]
> mod->data_layout.size = strict_align(mod->data_layout.size);
> ^
> kernel/module/main.c:1467:26: warning: Redundant assignment of 'mod->data_layout.size' to itself. [selfAssignment]
> mod->data_layout.size = strict_align(mod->data_layout.size);
> ^
>
> This is due to strict_align() being a no-op when
> CONFIG_STRICT_MODULE_RWX is not selected.
>
> Transform strict_align() macro into an inline function. It will
> allow type checking and avoid the selfAssignment warning.
>
> Reported-by: kernel test robot <lkp@intel.com>
> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Queued up thanks!
Luis
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