[#4948] SHM does not work with MPU turned on

Submitted By: Mike Frysinger

Open Date

2009-03-02 11:38:22 Close Date

2009-04-08 22:12:03

Priority:

Medium Assignee:

Graf Yang

Status:

Closed Fixed In Release:

N/A

Found In Release:

snaps Release:

Category:

N/A Board:

N/A

Processor:

BF526 Silicon Revision:

Is this bug repeatable?:

Yes Resolution:

Fixed

Uboot version or rev.:

Toolchain version or rev.:

trunk

App binary format:

N/A

Summary: SHM does not work with MPU turned on

Details:

thread details and simple test case here (i havent verified):

blackfin.uclinux.org/gf/project/uclinux-dist/forum/?action=ForumBrowse&_forum_action=ForumMessageBrowse&thread_id=32758&forum_thread_style=threaded&forum_change_view=Change+view

Follow-ups

--- Mike Frysinger 2009-03-03 02:07:32

i'm attaching a cleaned up test case

to compile:

$ bfin-linux-uclibc-gcc -Wall shmtest.c -o shmtest

then on the board, run it twice ... first a reader then a writer, so might want

to login with telnet

$ shmtest r

$ shmtest w

now type somethings into the writer and it should show up in the reader

--- der knut 2009-03-11 08:41:25

More info at

blackfin.uclinux.org/gf/project/uclinux-dist/forum/?action=ForumBrowse&forum_id=39&_forum_action=ForumMessageBrowse&thread_id=32960

--- Michael Hennerich 2009-03-13 04:23:16

Graf,

FYI: According to Knut’s comments on the forum

- Enrik Berkhan and David Howells patch fixed this bug.

-Michael

--- Graf Yang 2009-03-13 05:41:07

Hi Michael,

Thanks! Seems Enrik's patch fixed Knut's problem. I will merge it to our

trunk.

The bug #4948 here is with MPU, still existed.

--- Graf Yang 2009-03-17 04:48:52

When protecting the pages for the new vma, the trail page is always not be

protected.

In shm case, the share memory is out of protection. Now it should be fixed.

Files

Changes

Commits

Dependencies

Duplicates

Associations

Partner Forums

Partner Libraries

[#4948] SHM does not work with MPU turned on