Re: [PATCH 04/18] ARM: at91: make ST (System Timer) soc independent

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]


On 20/02/12 14:23, Jean-Christophe PLAGNIOL-VILLARD wrote:

> On 14:16 Mon 20 Feb     , Ryan Mallon wrote:
>> On 20/02/12 14:02, Jean-Christophe PLAGNIOL-VILLARD wrote:
>>
>>> On 12:52 Mon 20 Feb     , Ryan Mallon wrote:
>>>> On 20/02/12 12:38, Jean-Christophe PLAGNIOL-VILLARD wrote:
>>>>
>>>>> On 11:22 Mon 20 Feb     , Ryan Mallon wrote:
>>>>>> On 18/02/12 04:49, Nicolas Ferre wrote:
>>>>>>
>>>>>>> From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx>
>>>>>>>
>>>>>>> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx>
>>>>>>> Acked-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
>>>>>>> ---
>>>>>>>  arch/arm/mach-at91/at91rm9200.c              |    4 +-
>>>>>>>  arch/arm/mach-at91/at91rm9200_time.c         |   37 ++++++++++++++++----------
>>>>>>>  arch/arm/mach-at91/generic.h                 |    1 +
>>>>>>>  arch/arm/mach-at91/include/mach/at91_st.h    |   32 +++++++++++++++-------
>>>>>>>  arch/arm/mach-at91/include/mach/at91rm9200.h |    2 +-
>>>>>>>  drivers/watchdog/at91rm9200_wdt.c            |    8 +++---
>>>>>>>  6 files changed, 53 insertions(+), 31 deletions(-)
>>>>>>>
>>>>>>> diff --git a/arch/arm/mach-at91/at91rm9200.c b/arch/arm/mach-at91/at91rm9200.c
>>>>>>
>>>>>> Hi Jean, Nicolas,
>>>>>>
>>>>>> Patch looks mostly good, couple of points below.
>>>>>>
>>>>>> ~Ryan
>>>>>>
>>>>>> <snip>
>>>>>>
>>>>>>>  	/* Cancel any pending alarm; flush any pending IRQ */
>>>>>>> -	at91_sys_write(AT91_ST_RTAR, alm);
>>>>>>> -	(void) at91_sys_read(AT91_ST_SR);
>>>>>>> +	at91_st_write(AT91_ST_RTAR, alm);
>>>>>>> +	(void) at91_st_read(AT91_ST_SR);
>>>>>>
>>>>>>
>>>>>> Can we please remove the (void) casting of the return value when making
>>>>>> this change, especially since at91_st_read is now a macro which doesn't
>>>>>> even have a return value. Same in a few other places.
>>>>> modification done by script and it's no the scope of this patch
>>>>
>>>>
>>>> That isn't an excuse to leave incorrect code there. It is a simple fix.
>>> no (void) in c means you don't care of the return so basically it's right
>>
>>
>> Because of the way the __raw_writel is defined you are casting the
>> result of an assignment, basically you are doing this:
>>
>>    int foo, bar;
>>
>>   (void)(foo = bar);
>>
>> Which is pointless. Don't make excuses for silly, redundant code. Fix
>> it, please.
> except it's a read it has nothing to do with that


It makes no difference, it is still equally pointless. We don't cast
unused return values to void, for functions or assignments, in the kernel.

It is pointless, superfluous code, and now is a really good opportunity
to fix it. You can probably even make your script do it for you :-).

~Ryan

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/


[Other Archives]     [Linux Kernel Newbies]     [Linux Driver Development]     [Fedora Kernel]     [Linux Kernel Testers]     [Linux SH]     [Linux Omap]     [Linux Kbuild]     [Linux Tape]     [Linux Input]     [Linux Kernel Janitors]     [Linux Kernel Packagers]     [Linux Doc]     [Linux Man Pages]     [Linux API]     [Linux Memory Management]     [Linux Modules]     [Linux Standards]     [Kernel Announce]     [Netdev]     [Git]     [Linux PCI]     Linux CAN Development     [Linux I2C]     [Linux RDMA]     [Linux NUMA]     [Netfilter]     [Netfilter Devel]     [SELinux]     [Bugtraq]     [FIO]     [Linux Perf Users]     [Linux Serial]     [Linux PPP]     [Linux ISDN]     [Linux Next]     [Kernel Stable Commits]     [Linux Tip Commits]     [Kernel MM Commits]     [Linux Security Module]     [Filesystem Development]     [Ext3 Filesystem]     [Linux bcache]     [Ext4 Filesystem]     [Linux BTRFS]     [Linux CEPH Filesystem]     [Linux XFS]     [XFS]     [Linux NFS]     [Linux CIFS]     [Ecryptfs]     [Linux NILFS]     [Linux Cachefs]     [Reiser FS]     [Initramfs]     [Linux FB Devel]     [Linux OpenGL]     [DRI Devel]     [Fastboot]     [Linux RT Users]     [Linux RT Stable]     [eCos]     [Corosync]     [Linux Clusters]     [LVS Devel]     [Hot Plug]     [Linux Virtualization]     [KVM]     [KVM PPC]     [KVM ia64]     [Linux Containers]     [Linux Hexagon]     [Linux Cgroups]     [Util Linux]     [Wireless]     [Linux Bluetooth]     [Bluez Devel]     [Ethernet Bridging]     [Embedded Linux]     [Barebox]     [Linux MMC]     [Linux IIO]     [Sparse]     [Smatch]     [Linux Arch]     [x86 Platform Driver]     [Linux ACPI]     [Linux IBM ACPI]     [LM Sensors]     [CPU Freq]     [Linux Power Management]     [Linmodems]     [Linux DCCP]     [Linux SCTP]     [ALSA Devel]     [Linux USB]     [Linux PA RISC]     [Linux Samsung SOC]     [MIPS Linux]     [IBM S/390 Linux]     [ARM Linux]     [ARM Kernel]     [ARM MSM]     [Tegra Devel]     [Sparc Linux]     [Linux Security]     [Linux Sound]     [Linux Media]     [Video 4 Linux]     [Linux IRDA Users]     [Linux for the blind]     [Linux RAID]     [Linux ATA RAID]     [Device Mapper]     [Linux SCSI]     [SCSI Target Devel]     [Linux SCSI Target Infrastructure]     [Linux IDE]     [Linux SMP]     [Linux AXP]     [Linux Alpha]     [Linux M68K]     [Linux ia64]     [Linux 8086]     [Linux x86_64]     [Linux Config]     [Linux Apps]     [Linux MSDOS]     [Linux X.25]     [Linux Crypto]     [DM Crypt]     [Linux Trace Users]     [Linux Btrace]     [Linux Watchdog]     [Utrace Devel]     [Linux C Programming]     [Linux Assembly]     [Dash]     [DWARVES]     [Hail Devel]     [Linux Kernel Debugger]     [Linux gcc]     [Gcc Help]     [X.Org]     [Wine]

Add to Google Powered by Linux

[Older Kernel Discussion]     [Yosemite National Park Forum]     [Large Format Photos]     [Gimp]     [Yosemite Photos]     [Stuff]