Re: BLCR and kernel 2.6.32

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From: Paul H. Hargrove (PHHargrove_at_lbl_dot_gov)
Date: Fri Dec 18 2009 - 16:40:15 PST

  • Next message: Alan Woodland: "Re: BLCR and kernel 2.6.32" 
    Paul H. Hargrove wrote:
> Alan Woodland wrote:
>> 2009/12/18 Yuri D'Elia <yuri.delia_at_eurac_dot_edu>:
>>  
>>> Just tried to see the dkms boot script in action...
>>>
>>> checking kernel symbol table for exported register_chrdev... not found
>>> ======================================================================
>>> Please review the following configuration information:
>>>  Kernel source directory = /lib/modules/2.6.32-trunk-amd64/build
>>>  Kernel build directory = /lib/modules/2.6.32-trunk-amd64/build
>>>  Kernel symbol table = /boot/System.map-2.6.32-trunk-amd64
>>>  Kernel version probed from kernel build = 2.6.32-trunk-amd64
>>>  Kernel running currently = 2.6.32-trunk-amd64
>>> ======================================================================
>>> configure: error: Unable to use kernel 2.6.32-trunk-amd64 - kernel does
>>> not export register_chrdev
>>>
>>> whoops :|
>>>     
>>
>> Looks like things changed a bit in 2.6.32 again. I'm not going to have
>> time to look at it properly until the new year, although possibly
>> someone upstream has already encountered this one?
>>
>> Alan
>>
>>   
>
> Regretfully, I also don't expect to look at this much until January.
> I'll try look today to see if it is something quick, but doubt that it 
> will be.
>
> -Paul
>

Good news.  This DID turn out to be a small/easy change.  With the 
attached patch (in addition to the patch for 2.6.31 support) I can 
configure, build and pass "make check" with a 2.6.32 kernel (from 
kernel.org) on a PPC64 machine.

-Paul

-- 
Paul H. Hargrove                          PHHargrove_at_lbl_dot_gov
Future Technologies Group                 Tel: +1-510-495-2352
HPC Research Department                   Fax: +1-510-486-6900
Lawrence Berkeley National Laboratory     


# Apply this patch AFTER blcr-0.8.2+kernel-2.6.31.patch01
#  -Paul
Index: configure.ac
===================================================================
RCS file: /var/local/cvs/lbnl_cr/configure.ac,v
retrieving revision 1.410.2.9
diff -u -r1.410.2.9 configure.ac
--- configure.ac	15 Jun 2009 22:33:56 -0000	1.410.2.9
+++ configure.ac	19 Dec 2009 00:37:32 -0000
@@ -1536,7 +1536,10 @@
 # the System.map used to locate symbols and configure time.
 CR_FIND_EXPORTED_KSYM([register_chrdev],[CODE])
 if test "$cr_addr" = "0"; then
-  CR_BAD_KERNEL([kernel does not export register_chrdev])
+  CR_FIND_EXPORTED_KSYM([__register_chrdev],[CODE])
+  if test "$cr_addr" = "0"; then
+    CR_BAD_KERNEL([kernel does not export register_chrdev or __register_chrdev])
+  fi
 fi
 CR_FIND_EXPORTED_KSYM([register_blkdev],[CODE])
 if test "$cr_addr" = "0"; then
Index: blcr_imports/module.c
===================================================================
RCS file: /var/local/cvs/lbnl_cr/blcr_imports/module.c,v
retrieving revision 1.2
diff -u -r1.2 module.c
--- blcr_imports/module.c	13 May 2008 06:06:19 -0000	1.2
+++ blcr_imports/module.c	19 Dec 2009 00:37:32 -0000
@@ -81,7 +81,13 @@
 
 	/* Check current kernel against System.map used at configure time */
 	{
+#if defined(CR_EXPORTED_KCODE_register_chrdev)
 	    unsigned long offset1 = CR_EXPORTED_KCODE_register_chrdev - (unsigned long)&register_chrdev;
+#elif defined(CR_EXPORTED_KCODE___register_chrdev)
+	    unsigned long offset1 = CR_EXPORTED_KCODE___register_chrdev - (unsigned long)&__register_chrdev;
+#else
+	    #error "No register_chrdev symbol for validation of System.map"
+#endif
 	    unsigned long offset2 = CR_EXPORTED_KCODE_register_blkdev - (unsigned long)&register_blkdev;
 	    if (
 #if defined(CONFIG_RELOCATABLE) && defined(CONFIG_PHYSICAL_ALIGN)
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