arch/tile: properly flush the I$ when unloading kernel modules

Otherwise, in principle, there could be stale I$ data present
next time the page that previously held the kernel module code was
used to run some new code.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

diff --git a/arch/tile/kernel/module.c b/arch/tile/kernel/module.c
index e2ab82b..f68df69 100644 (file)
--- a/arch/tile/kernel/module.c
+++ b/arch/tile/kernel/module.c
@@ -22,6 +22,7 @@
 #include <linux/kernel.h>
 #include <asm/opcode-tile.h>
 #include <asm/pgtable.h>
+#include <asm/homecache.h>
 
 #ifdef __tilegx__
 # define Elf_Rela Elf64_Rela
@@ -86,8 +87,13 @@ error:
 void module_free(struct module *mod, void *module_region)
 {
        vfree(module_region);
+
+       /* Globally flush the L1 icache. */
+       flush_remote(0, HV_FLUSH_EVICT_L1I, cpu_online_mask,
+                    0, 0, 0, NULL, NULL, 0);
+
        /*
-        * FIXME: If module_region == mod->init_region, trim exception
+        * FIXME: If module_region == mod->module_init, trim exception
         * table entries.
         */
 }