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Description of problem:

Wade reported a compile error of el6 kernel on Fedora

arch/x86/include/asm/pgtable_64.h:98:20: warning: conflicting types for ‘native_pmd_clear’ [enabled by default]
arch/x86/include/asm/pgtable_64.h:98:20: error: static declaration of ‘native_pmd_clear’ follows non-static declaration
arch/x86/include/asm/pgtable_64.h:87:2: note: previous implicit declaration of ‘native_pmd_clear’ was here

which is caused by the following commit:

commit 27473d67d4d15abf02179c99d9e02ef72e0c478a
Author: Andrea Arcangeli <aarcange>
Date:   Mon Feb 1 15:17:11 2010 -0500

    [mm] add pmd mangling functions to x86

This is due to,

+#ifdef CONFIG_SMP
+       return native_make_pmd(xchg(&xp->pmd, 0));
+#else
+       /* native_local_pmdp_get_and_clear,
+          but duplicated because of cyclic dependency */
+       pmd_t ret = *xp;
+       native_pmd_clear(NULL, 0, xp);    <============= This line
+       return ret;
+#endif

while the prototype of native_pmd_clear() is

 static inline void native_pmd_clear(pmd_t *pmd) 

Additional info:

Since we don't support modified .config, this problem is not serious.

Patch(es) available on kernel-2.6.32-169.el6

This request was evaluated by Red Hat Product Management for inclusion
in a Red Hat Enterprise Linux maintenance release. Product Management has 
requested further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed 
products. This request is not yet committed for inclusion in an Update release.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2011-1530.html