Re: [PATCH v5 2/2] decrement static keys on real destroy time

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

On Wed, 16 May 2012 11:03:47 +0400
Glauber Costa <glommer@xxxxxxxxxxxxx> wrote:

> On 05/14/2012 05:38 AM, Li Zefan wrote:
> >> +static void disarm_static_keys(struct mem_cgroup *memcg)
> > 
> >> +{
> >> +#ifdef CONFIG_INET
> >> +	if (memcg->tcp_mem.cg_proto.activated)
> >> +		static_key_slow_dec(&memcg_socket_limit_enabled);
> >> +#endif
> >> +}
> > 
> > 
> > Move this inside the ifdef/endif below ?
> > 
> > Otherwise I think you'll get compile error if !CONFIG_INET...
> I don't fully get it.
> We are supposed to provide a version of it for
> CONFIG_CGROUP_MEM_RES_CTLR_KMEM and an empty version for
> Inside the first, we take an action for CONFIG_INET, and no action for
> Bear in mind that the slab patches will add another test to that place,
> and that's why I am doing it this way from the beginning.
> Well, that said, I not only can be wrong, I very frequently am.
> But I just compiled this one with and without CONFIG_INET, and it seems
> to be going alright.

Yes, the ifdeffings in that area are rather nasty.

I wonder if it would be simpler to do away with the ifdef nesting. 
At the top-level, just do

static void disarm_static_keys(struct mem_cgroup *memcg)
	if (memcg->tcp_mem.cg_proto.activated)
static inline void disarm_static_keys(struct mem_cgroup *memcg)

The tcp_proto_cgroup() definition could go inside that ifdef as well.
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at

[Linux Kernel Discussion]     [Ethernet Bridging]     [Linux Wireless Networking]     [Linux Bluetooth Networking]     [Linux Networking Users]     [VLAN]     [Git]     [IETF Annouce]     [Linux Assembly]     [Security]     [Bugtraq]     [Photo]     [Singles Social Networking]     [Yosemite Information]     [MIPS Linux]     [ARM Linux Kernel]     [ARM Linux]     [Linux Virtualization]     [Linux Security]     [Linux IDE]     [Linux RAID]     [Linux SCSI]     [Free Dating]

Add to Google Powered by Linux