Merge tag 'gcc-plugins-v4.9-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull gcc plugin fixes from Kees Cook:
 - make sure required exports from gcc plugins are visible to gcc
 - switch latent_entropy to unsigned long to avoid stack frame bloat

* tag 'gcc-plugins-v4.9-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  latent_entropy: Fix wrong gcc code generation with 64 bit variables
  gcc-plugins: Export symbols needed by gcc

mm/page_alloc.c

@@ -92,7 +92,7 @@ int _node_numa_mem_[MAX_NUMNODES];
 #endif
 
 #ifdef CONFIG_GCC_PLUGIN_LATENT_ENTROPY
-volatile u64 latent_entropy __latent_entropy;
+volatile unsigned long latent_entropy __latent_entropy;
 EXPORT_SYMBOL(latent_entropy);
 #endif
 

scripts/gcc-plugins/cyc_complexity_plugin.c

@@ -20,7 +20,7 @@
 
 #include "gcc-common.h"
 
-int plugin_is_GPL_compatible;
+__visible int plugin_is_GPL_compatible;
 
 static struct plugin_info cyc_complexity_plugin_info = {
 	.version	= "20160225",
@@ -49,7 +49,7 @@ static unsigned int cyc_complexity_execute(void)
 
 #include "gcc-generate-gimple-pass.h"
 
-int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version)
+__visible int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version)
 {
 	const char * const plugin_name = plugin_info->base_name;
 	struct register_pass_info cyc_complexity_pass_info;

scripts/gcc-plugins/gcc-common.h

@@ -130,6 +130,7 @@ extern void dump_gimple_stmt(pretty_printer *, gimple, int, int);
 #endif
 
 #define __unused __attribute__((__unused__))
+#define __visible __attribute__((visibility("default")))
 
 #define DECL_NAME_POINTER(node) IDENTIFIER_POINTER(DECL_NAME(node))
 #define DECL_NAME_LENGTH(node) IDENTIFIER_LENGTH(DECL_NAME(node))

scripts/gcc-plugins/latent_entropy_plugin.c

@@ -77,7 +77,7 @@
 
 #include "gcc-common.h"
 
-int plugin_is_GPL_compatible;
+__visible int plugin_is_GPL_compatible;
 
 static GTY(()) tree latent_entropy_decl;
 
@@ -340,7 +340,7 @@ static enum tree_code get_op(tree *rhs)
 		break;
 	}
 	if (rhs)
-		*rhs = build_int_cstu(unsigned_intDI_type_node, random_const);
+		*rhs = build_int_cstu(long_unsigned_type_node, random_const);
 	return op;
 }
 
@@ -372,7 +372,7 @@ static void __perturb_latent_entropy(gimple_stmt_iterator *gsi,
 	enum tree_code op;
 
 	/* 1. create temporary copy of latent_entropy */
-	temp = create_var(unsigned_intDI_type_node, "tmp_latent_entropy");
+	temp = create_var(long_unsigned_type_node, "temp_latent_entropy");
 
 	/* 2. read... */
 	add_referenced_var(latent_entropy_decl);
@@ -459,13 +459,13 @@ static void init_local_entropy(basic_block bb, tree local_entropy)
 	gsi_insert_before(&gsi, call, GSI_NEW_STMT);
 	update_stmt(call);
 
-	udi_frame_addr = fold_convert(unsigned_intDI_type_node, frame_addr);
+	udi_frame_addr = fold_convert(long_unsigned_type_node, frame_addr);
 	assign = gimple_build_assign(local_entropy, udi_frame_addr);
 	gsi_insert_after(&gsi, assign, GSI_NEW_STMT);
 	update_stmt(assign);
 
 	/* 3. create temporary copy of latent_entropy */
-	tmp = create_var(unsigned_intDI_type_node, "tmp_latent_entropy");
+	tmp = create_var(long_unsigned_type_node, "temp_latent_entropy");
 
 	/* 4. read the global entropy variable into local entropy */
 	add_referenced_var(latent_entropy_decl);
@@ -480,7 +480,7 @@ static void init_local_entropy(basic_block bb, tree local_entropy)
 	update_stmt(assign);
 
 	rand_cst = get_random_const();
-	rand_const = build_int_cstu(unsigned_intDI_type_node, rand_cst);
+	rand_const = build_int_cstu(long_unsigned_type_node, rand_cst);
 	op = get_op(NULL);
 	assign = create_assign(op, local_entropy, local_entropy, rand_const);
 	gsi_insert_after(&gsi, assign, GSI_NEW_STMT);
@@ -529,7 +529,7 @@ static unsigned int latent_entropy_execute(void)
 	}
 
 	/* 1. create the local entropy variable */
-	local_entropy = create_var(unsigned_intDI_type_node, "local_entropy");
+	local_entropy = create_var(long_unsigned_type_node, "local_entropy");
 
 	/* 2. initialize the local entropy variable */
 	init_local_entropy(bb, local_entropy);
@@ -561,10 +561,9 @@ static void latent_entropy_start_unit(void *gcc_data __unused,
 	if (in_lto_p)
 		return;
 
-	/* extern volatile u64 latent_entropy */
-	gcc_assert(TYPE_PRECISION(long_long_unsigned_type_node) == 64);
-	quals = TYPE_QUALS(long_long_unsigned_type_node) | TYPE_QUAL_VOLATILE;
-	type = build_qualified_type(long_long_unsigned_type_node, quals);
+	/* extern volatile unsigned long latent_entropy */
+	quals = TYPE_QUALS(long_unsigned_type_node) | TYPE_QUAL_VOLATILE;
+	type = build_qualified_type(long_unsigned_type_node, quals);
 	id = get_identifier("latent_entropy");
 	latent_entropy_decl = build_decl(UNKNOWN_LOCATION, VAR_DECL, id, type);
 
@@ -584,7 +583,7 @@ static void latent_entropy_start_unit(void *gcc_data __unused,
 	| TODO_update_ssa
 #include "gcc-generate-gimple-pass.h"
 
-int plugin_init(struct plugin_name_args *plugin_info,
+__visible int plugin_init(struct plugin_name_args *plugin_info,
 			  struct plugin_gcc_version *version)
 {
 	bool enabled = true;

scripts/gcc-plugins/sancov_plugin.c

@@ -21,7 +21,7 @@
 
 #include "gcc-common.h"
 
-int plugin_is_GPL_compatible;
+__visible int plugin_is_GPL_compatible;
 
 tree sancov_fndecl;
 
@@ -86,7 +86,7 @@ static void sancov_start_unit(void __unused *gcc_data, void __unused *user_data)
 #endif
 }
 
-int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version)
+__visible int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version)
 {
 	int i;
 	struct register_pass_info sancov_plugin_pass_info;