From: Fabio Aiuto <fabioaiuto83@gmail.com>
To: gregkh@linuxfoundation.org
Cc: hdegoede@redhat.com, Larry.Finger@lwfinger.net,
linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org,
David Sterba <dsterba@suse.cz>
Subject: [PATCH v2] staging: rtl8723bs: remove unused BIT macros definitions
Date: Fri, 30 Jul 2021 15:40:48 +0200 [thread overview]
Message-ID: <20210730134048.8736-1-fabioaiuto83@gmail.com> (raw)
BIT(x) macro used all over the driver is defined in
include/vsdo/bit.h as
- #define BIT(nr) (UL(1) << (nr))
which is safer than the local BIT macros declared.
Local macros shift a signed integer which brings
unespected results. For example:
(unsigned long)(1 << 31) => 0xffffffff80000000
shift.c:
int main() {
printf("%lx\n", (unsigned long)(1 << 31));
printf("%lx\n", (unsigned long)(1U << 31));
return 0;
}
...
$ ./shift
ffffffff80000000
80000000
...
So just remove redundant, less safe macro declarations.
Suggested-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
---
Changes in v2:
- Edited changelog
drivers/staging/rtl8723bs/include/osdep_service.h | 4 ----
drivers/staging/rtl8723bs/include/wifi.h | 8 --------
2 files changed, 12 deletions(-)
diff --git a/drivers/staging/rtl8723bs/include/osdep_service.h b/drivers/staging/rtl8723bs/include/osdep_service.h
index b49838c7e457..bde415db4114 100644
--- a/drivers/staging/rtl8723bs/include/osdep_service.h
+++ b/drivers/staging/rtl8723bs/include/osdep_service.h
@@ -14,10 +14,6 @@
#include <osdep_service_linux.h>
-#ifndef BIT
- #define BIT(x) (1 << (x))
-#endif
-
#define BIT0 0x00000001
#define BIT1 0x00000002
#define BIT2 0x00000004
diff --git a/drivers/staging/rtl8723bs/include/wifi.h b/drivers/staging/rtl8723bs/include/wifi.h
index 0bd7b662b972..f03e26818d45 100644
--- a/drivers/staging/rtl8723bs/include/wifi.h
+++ b/drivers/staging/rtl8723bs/include/wifi.h
@@ -7,14 +7,6 @@
#ifndef _WIFI_H_
#define _WIFI_H_
-
-#ifdef BIT
-/* error "BIT define occurred earlier elsewhere!\n" */
-#undef BIT
-#endif
-#define BIT(x) (1 << (x))
-
-
#define WLAN_ETHHDR_LEN 14
#define WLAN_ETHADDR_LEN 6
#define WLAN_IEEE_OUI_LEN 3
--
2.20.1
next reply other threads:[~2021-07-30 13:41 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-30 13:40 Fabio Aiuto [this message]
-- strict thread matches above, loose matches on Subject: below --
2021-07-30 13:39 [PATCH v2] staging: rtl8723bs: remove unused BIT macros definitions Fabio Aiuto
2021-07-30 13:42 ` Fabio Aiuto
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