powerpc: Fix loss of vdso on fork on 32-bit
authorBenjamin Herrenschmidt <benh@kernel.crashing.org>
Tue, 12 Aug 2008 07:03:26 +0000 (17:03 +1000)
committerPaul Mackerras <paulus@samba.org>
Mon, 18 Aug 2008 04:22:34 +0000 (14:22 +1000)
commit3fadc52b2c9171b138b93f4a0121ceba67241b3b
tree24512228e7afbf4c8fcdce6be9175f9655249ffc
parentd121db94eb50b29a202b5f6a8671cbebdf2c4142
powerpc: Fix loss of vdso on fork on 32-bit

When we fork, init_new_context() improperly resets the vdso_base
of the new context to 0.  That means that the new process loses
access to the vdso for signal trampolines.

The initialization should be unnecessary anyway as the context
on a fresh mm should be 0 in the first place and binfmt_elf
will initialize that value for a newly loaded process.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
arch/powerpc/include/asm/mmu_context.h