Re: [PATCH net-next v4 3/3] eventpoll: Add epoll ioctl for epoll_params

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

 



On Wed, Jan 31, 2024 at 07:03:54AM +0100, Jiri Slaby wrote:
> On 31. 01. 24, 3:27, Joe Damato wrote:
> > On Tue, Jan 30, 2024 at 06:08:36PM -0800, Greg Kroah-Hartman wrote:
> > > On Wed, Jan 31, 2024 at 01:47:33AM +0000, Joe Damato wrote:
> > > > +struct epoll_params {
> > > > +	__aligned_u64 busy_poll_usecs;
> > > > +	__u16 busy_poll_budget;
> > > > +
> > > > +	/* pad the struct to a multiple of 64bits for alignment on all arches */
> > > > +	__u8 __pad[6];
> > > 
> > > You HAVE to check this padding to be sure it is all 0, otherwise it can
> > > never be used in the future for anything.
> > 
> > Is there some preferred mechanism for this in the kernel that I should be
> > using or is this as simple as adding a for loop to check each u8 == 0 ?
> 
> You are likely looking for memchr_inv().

Ah, never noticed that, thanks!




[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [NTFS 3]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [NTFS 3]     [Samba]     [Device Mapper]     [CEPH Development]

  Powered by Linux