Ali Sohanghpurwala wrote:
Ali Sohanghpurwala <[EMAIL PROTECTED]> writes:
Patching the 2.6.26-davinci1 kernel with patch-2.6.26-rt1 went smoothly.
Unfortunately when I try to compile I get errors:
kernel/built-in.o(.text+0xdfd4): In function `__tasklet_hi_schedule':
include/asm-generic/cmpxchg-local.h:42: undefined reference to
`wrong_size_cmpxchg'
kernel/built-in.o(.text+0xe12c): In function `__tasklet_schedule':
include/asm-generic/cmpxchg-local.h:42: undefined reference to
`wrong_size_cmpxchg'
kernel/built-in.o(.text+0xe404): In function `__tasklet_action':
include/asm-generic/cmpxchg-local.h:42: undefined reference to
`wrong_size_cmpxchg'
make: *** [.tmp_vmlinux1] Error 1
On top of the rt-preempt patch, I incorporated changes from this post (the
sound driver changes, not the irq/manage.c changes):
http://tinyurl.com/5awu5s
Ali
I was able to 'fix' the problem myself. I simply created a dummy function
wrong_size_cmpxchg which returns 0. Admittedly this is a dirty hack since I
have no idea what will happen if a wrong size compare/exchange does occur.
If anyone here knows what wrong_size_cmpxchg is supposed to do, or where it is
supposed to be(perhaps in an assembly file?) I would love to know.
Maybe this can help you:
http://www.mail-archive.com/[EMAIL PROTECTED]/msg01448.html
http://groups.google.com/group/fa.linux.kernel/browse_thread/thread/9984428beb5c1c59/b62525e047966841?show_docid=b62525e047966841
Dirk
Once booted I was getting Kernel BUG warnings every second. I found the fix in
this patch:
http://lists.blagblagblag.org/message/20080807.213509.3ac33bb0.en.html
So for anyone wanting to run kernel 2.6.26 on a davinci platform here are the
steps to follow:
1. patch the point release v2.6.26-davinci1 with patch-2.6.26-rt1.bz2:
http://www.kernel.org/pub/linux/kernel/projects/rt/older/patch-2.6.26-rt1.bz2
2. Add the dummy wrong_size_cmpxchg function to
include/asm-generic/cmpxchg-local.h
3. Incorporate changes from patch detailed here:
http://lists.blagblagblag.org/message/20080807.213509.3ac33bb0.en.html
I had incorporated these into a patch, but the some lines are longer than 80
characters and I don't know how to attach it. If anyone can tell me how to do
this, I will attach the patch.
Let me know if this works for you, I've tested it on the evm and our custom
board. I haven't tried any of the rt-preempt functionality yet, but all our
regular drivers and programs work.
Thanks,
Ali
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