VDSO for arm 32bit

[Mikael Pettersson]

Kumar, Ganesh writes:
 > Hi All,
 > 
 >   I'm working on OMAP5 on greg's LTS kernel 3.4.25, but I see there is
 > no support for vdso for arm 32 bit.
 > I'm planning to port it to arm 32 bit, is there any work under progress?
 > would like to understand why the support for arm 32 bit is not there, any idea?

32-bit ARM has a "kuser" page at a fixed virtual address, which exports a
few critical routines to user-space.  With that, a vdso is mostly redundant.