ARM: Fix sparsemem with SPARSEMEM_EXTREME enabled
When SPARSEMEM_EXTREME is enabled, memory_present() wants to use bootmem
to allocate data structures. However, we call memory_present() after
declaring memory to bootmem, but before we've reserved areas.
This leads to sparsemem data structures being overwritten later in the
kernel's initialization (when slab initializes.)
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 40940d7..52c40d1 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -273,7 +273,6 @@
struct membank *bank = &mi->bank[i];
if (!bank->highmem)
free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank));
- memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank));
}
/*
@@ -370,6 +369,19 @@
return 0;
}
EXPORT_SYMBOL(pfn_valid);
+
+static void arm_memory_present(struct meminfo *mi, int node)
+{
+}
+#else
+static void arm_memory_present(struct meminfo *mi, int node)
+{
+ int i;
+ for_each_nodebank(i, mi, node) {
+ struct membank *bank = &mi->bank[i];
+ memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank));
+ }
+}
#endif
static int __init meminfo_cmp(const void *_a, const void *_b)
@@ -427,6 +439,12 @@
*/
if (node == initrd_node)
bootmem_reserve_initrd(node);
+
+ /*
+ * Sparsemem tries to allocate bootmem in memory_present(),
+ * so must be done after the fixed reservations
+ */
+ arm_memory_present(mi, node);
}
/*