Unknown Symbol fc20

[Dave Anderson]

> > while yum updating
> > 
> > Installing :
> > kernel-3.11.0-0.rc0.git2.1.fc20.x86_64
> > 1/1 depmod:
> > WARNING: /lib/modules/3.11.0-0.rc0.git2.1.fc20.x86_64/kernel/drivers/char/crash.ko
> > needs unknown symbol page_is_ram Verifying  :
> > kernel-3.11.0-0.rc0.git2.1.fc20.x86_64                                                                       
> Thanks.  Someone else reported this yesterday as well.  It shouldn't
> cause any problems for most Fedora users, as it will only impact those
> using the crash tool.
> 
> josh

OK, but for those of us who use it, the change that presumably causes this 
would be this part of this commit:

commit c5a130325f13b219438cb100e2da71a3e31199f3
Author: Chen Gong <gong.chen at linux.intel.com>
Date:   Thu Jun 6 15:20:51 2013 -0700

    ACPI/APEI: Add parameter check before error injection
    
    When param1 is enabled in EINJ but not assigned with a valid
    value, sometimes it will cause the error like below:
    
    APEI: Can not request [mem 0x7aaa7000-0x7aaa7007] for APEI EINJ Trigger registers
    
    It is because some firmware will access target address specified in
    param1 to trigger the error when injecting memory error. This will
    cause resource conflict with regular memory. So It must be removed
    from trigger table resources, but incorrect param1/param2
    combination will stop this action. Add extra check to avoid
    this kind of error.
    
    Signed-off-by: Chen Gong <gong.chen at linux.intel.com>
    Signed-off-by: Tony Luck <tony.luck at intel.com>

diff --git a/kernel/resource.c b/kernel/resource.c
index d738698..77bf11a 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -409,6 +409,7 @@ int __weak page_is_ram(unsigned long pfn)
 {
        return walk_system_ram_range(pfn, 1, NULL, __is_ram) == 1;
 }
+EXPORT_SYMBOL_GPL(page_is_ram);
 
 void __weak arch_remove_reservations(struct resource *avail)
 {


where the additional EXPORT_SYMBOL_GPL(page_is_ram) above now makes
it available from both kernel/resource.c and arch/x86/mm/ioremap.c.  
Why would that make it an unknown symbol? 

Dave