From: Chris Metcalf <cmetcalf@tilera.com>
Date: Mon, 2 May 2011 19:35:06 +0000 (-0400)
Subject: arch/tile: properly flush the I$ when unloading kernel modules
X-Git-Tag: v3.0-rc1~152^2~20
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=229f4df1fb84e5d3306b4fc49b41f7847340092d;p=linux.git

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 e2ab82b7c7e7..f68df69f1f67 100644
--- 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 @@ void *module_alloc(unsigned long size)
 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.
 	 */
 }