Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[karo-tx-linux.git] / arch / powerpc / include / asm / machdep.h

diff --git a/arch/powerpc/include/asm/machdep.h b/arch/powerpc/include/asm/machdep.h
index cab6753f1be56e3f1810be80d50cf94524eaa04b..3f191f573d4f1f487b5e417ddd55eaed8d49951d 100644 (file)
--- a/arch/powerpc/include/asm/machdep.h
+++ b/arch/powerpc/include/asm/machdep.h
@@ -61,8 +61,13 @@ struct machdep_calls {
                                               unsigned long addr,
                                               unsigned char *hpte_slot_array,
                                               int psize, int ssize, int local);
-       /* special for kexec, to be called in real mode, linear mapping is
-        * destroyed as well */
+       /*
+        * Special for kexec.
+        * To be called in real mode with interrupts disabled. No locks are
+        * taken as such, concurrent access on pre POWER5 hardware could result
+        * in a deadlock.
+        * The linear mapping is destroyed as well.
+        */
        void            (*hpte_clear_all)(void);
 
        void __iomem *  (*ioremap)(phys_addr_t addr, unsigned long size,