linux-kernel - Re: Cross Memory Attach v3

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Date:	Sun, 20 Nov 2011 11:16:17 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Christopher Yeoh <cyeoh@....ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linux-man@...r.kernel.org,
	linux-arch@...r.kernel.org,
	"Linux/m68k" <linux-m68k@...r.kernel.org>
Subject: Re: Cross Memory Attach v3

Hi Christopher,

On Mon, Jul 18, 2011 at 17:05, Christopher Yeoh <cyeoh@....ibm.com> wrote:
> For arch maintainers there are some simple tests to be able to quickly
> verify that the syscalls are working correctly here:

I'm wiring up these new syscalls on m68k.

> http://ozlabs.org/~cyeoh/cma/cma-test-20110718.tgz

The included README talks about:

    setup_process_readv_simple
    setup_process_readv_iovec
   setup_process_writev

while the actual test executables are called:

    setup_process_vm_readv_simple
    setup_process_vm_readv_iovec
    setup_process_vm_writev

On m68k (ARAnyM), the first and third test succeed. The second one
fails, though:

# Setting up target with num iovecs 10, test buffer size 100000
Target process is setup
Run the following to test:
./t_process_vm_readv_iovec 1574 10 0x800030b0 89 0x80003110 38302
0x8000c6b8 22423 0x80011e58 18864 0x80016810 583 0x80016a60 8054
0x800189e0 3417 0x80019740 368 0x800198b8 897 0x80019c40 7003

and in the other window:

# ./t_process_vm_readv_iovec 1574 10 0x800030b0 89 0x80003110 38302
0x8000c6b8 22423 0x80011e58 18864 0x80016810 583 0x80016a60 8054
0x800189e0 3417 0x80019740 368 0x800198b8 897 0x80019c40 7003
copy_from_process failed: Invalid argument
error code: 29
#

Any suggestions?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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