Re: [PATCH 1/2] MIPS: Preliminary vdso.

[David Daney <ddaney@caviumnetworks.com>]

Shane McDonald wrote:
> Hello David:
> 
> On Tue, Apr 21, 2009 at 3:33 PM, David Daney <ddaney@caviumnetworks.com 
> <mailto:ddaney@caviumnetworks.com>> wrote:
> 
>     This is a preliminary patch to add a vdso to all user processes.
>     Still missing are ELF headers and .eh_frame information.  But it is
>     enough to allow us to move signal trampolines off of the stack.
> 
>     We allocate a single page (the vdso) and write all possible signal
>     trampolines into it.  The stack is moved down by one page and the vdso
>     is mapped into this space.
> 
> 
> This patch fails to compile for me with an RM7035C-based system (out of 
> tree, sadly).  The error I see is:
> 
>   CC      arch/mips/kernel/syscall.o
> arch/mips/kernel/syscall.c: In function 'arch_get_unmapped_area':
> arch/mips/kernel/syscall.c:80: error: 'TASK_SIZE32' undeclared (first 
> use in this function)
> arch/mips/kernel/syscall.c:80: error: (Each undeclared identifier is 
> reported only once
> arch/mips/kernel/syscall.c:80: error: for each function it appears in.)
> make[1]: *** [arch/mips/kernel/syscall.o] Error 1
> 

I never built a 32-bit kernel with the patch.  I will endeavor to fix this.

Thanks,
David Daney