kill off highmem_start_page (in -mm)

This patch should fix kgdb to work without highmem_start_page. However, I don't have a kgdb setup, and I'd appreciate someone testing this to make sure my selection of a new variable is OK.

Also, should this function possibly be using system_state, instead?

---

 memhotplug-dave/arch/i386/lib/kgdb_serial.c |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff -puN arch/i386/lib/kgdb_serial.c~A1-no-highmem_start_page-kgdb arch/i386/lib/kgdb_serial.c
@@ -407,7 +407,7 @@ void shutdown_for_kgdb(struct async_stru
 #ifdef CONFIG_DISCONTIGMEM
 static inline int kgdb_mem_init_done(void)
 {
-	return highmem_start_page != NULL;
+	return totalram_pages != 0;
 }
 #else
 static inline int kgdb_mem_init_done(void)

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