[Xen-devel] [patch 02/33] xen: paravirt: add a hook for once the allocator is ready

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Add a hook so that the paravirt backend knows when the allocator is
ready.  This is useful for the obvious reason that the allocator is
available, but the other side-effect of having the bootmem allocator
available is that each page now has an associated "struct page".

Signed-off-by: Jeremy Fitzhardinge <jeremy@xxxxxxxxxxxxx>

---
 arch/i386/kernel/setup.c    |    2 ++
 include/asm-i386/paravirt.h |    8 ++++++++
 include/asm-i386/setup.h    |    4 ++++
 3 files changed, 14 insertions(+)

===================================================================
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -611,6 +611,8 @@ void __init setup_arch(char **cmdline_p)
         * NOTE: at this point the bootmem allocator is fully available.
         */
 
+       paravirt_post_allocator_init();
+
        dmi_scan_machine();
 
 #ifdef CONFIG_X86_GENERICARCH
===================================================================
--- a/include/asm-i386/paravirt.h
+++ b/include/asm-i386/paravirt.h
@@ -52,6 +52,8 @@ struct paravirt_ops
        /* Basic arch-specific setup */
        void (*arch_setup)(void);
        char *(*memory_setup)(void);
+       void (*post_allocator_init)(void);
+
        void (*init_IRQ)(void);
        void (*time_init)(void);
 
@@ -669,6 +671,12 @@ static inline void setup_secondary_clock
 }
 #endif
 
+static inline void paravirt_post_allocator_init(void)
+{
+       if (paravirt_ops.post_allocator_init)
+               (*paravirt_ops.post_allocator_init)();
+}
+
 static inline void paravirt_pagetable_setup_start(pgd_t *base)
 {
        if (paravirt_ops.pagetable_setup_start)
===================================================================
--- a/include/asm-i386/setup.h
+++ b/include/asm-i386/setup.h
@@ -79,6 +79,10 @@ void __init add_memory_region(unsigned l
 
 extern unsigned long init_pg_tables_end;
 
+#ifndef CONFIG_PARAVIRT
+#define paravirt_post_allocator_init() do {} while(0)
+#endif
+
 #endif /* __ASSEMBLY__ */
 
 #endif  /*  __KERNEL__  */

-- 


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