pstree: Add general core_entry_free helper

This facrots out common core members freeing into pstree.c
helper. Per-arch freeing helpers are now symmetrical to the
allocating ones.

This is a merge of two Cyrill's patches.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

arch/arm/crtools.c

@@ -192,22 +192,17 @@ err:
 	return 0;
 }
 
-void core_entry_free(CoreEntry *core)
+void arch_free_thread_info(CoreEntry *core)
 {
-	if (core) {
 	if (CORE_THREAD_ARCH_INFO(core)) {
 		if (CORE_THREAD_ARCH_INFO(core)->fpstate) {
 			xfree(CORE_THREAD_ARCH_INFO(core)->fpstate->vfp_regs);
 			xfree(CORE_THREAD_ARCH_INFO(core)->fpstate);
 		}
 		xfree(CORE_THREAD_ARCH_INFO(core)->gpregs);
-		}
 		xfree(CORE_THREAD_ARCH_INFO(core));
-		xfree(core->thread_core);
-		xfree(core->tc);
-		xfree(core->ids);
+		CORE_THREAD_ARCH_INFO(core) = NULL;
 	}
-
 }
 
 int sigreturn_prep_fpu_frame(struct thread_restore_args *args, CoreEntry *core)

arch/arm/include/asm/dump.h

@@ -3,7 +3,7 @@
 
 extern int get_task_regs(pid_t pid, CoreEntry *core, const struct parasite_ctl *ctl);
 extern int arch_alloc_thread_info(CoreEntry *core);
-extern void core_entry_free(CoreEntry *core);
+extern void arch_free_thread_info(CoreEntry *core);
 
 
 static inline void core_put_tls(CoreEntry *core, u32 tls)

arch/x86/crtools.c

@@ -285,9 +285,8 @@ err:
 	return 1;
 }
 
-void core_entry_free(CoreEntry *core)
+void arch_free_thread_info(CoreEntry *core)
 {
-	if (core) {
 	if (core->thread_info) {
 		if (core->thread_info->fpregs) {
 			if (core->thread_info->fpregs->xsave)
@@ -299,11 +298,8 @@ void core_entry_free(CoreEntry *core)
 		}
 		xfree(core->thread_info->gpregs);
 		xfree(core->thread_info->fpregs);
-		}
 		xfree(core->thread_info);
-		xfree(core->thread_core);
-		xfree(core->tc);
-		xfree(core->ids);
+		core->thread_info = NULL;
 	}
 }
 

arch/x86/include/asm/dump.h

@@ -3,7 +3,7 @@
 
 extern int get_task_regs(pid_t pid, CoreEntry *core, const struct parasite_ctl *ctl);
 extern int arch_alloc_thread_info(CoreEntry *core);
-extern void core_entry_free(CoreEntry *core);
+extern void arch_free_thread_info(CoreEntry *core);
 
 
 #define core_put_tls(core, tls)

include/pstree.h

@@ -76,4 +76,6 @@ extern struct task_entries *task_entries;
 int get_task_ids(struct pstree_item *);
 extern struct _TaskKobjIdsEntry *root_ids;
 
+extern void core_entry_free(CoreEntry *core);
+
 #endif /* __CR_PSTREE_H__ */

pstree.c

@@ -9,11 +9,23 @@
 #include "namespaces.h"
 #include "files.h"
 
+#include "asm/dump.h"
+
 #include "protobuf.h"
 #include "protobuf/pstree.pb-c.h"
 
 struct pstree_item *root_item;
 
+void core_entry_free(CoreEntry *core)
+{
+	if (core) {
+		arch_free_thread_info(core);
+		xfree(core->thread_core);
+		xfree(core->tc);
+		xfree(core->ids);
+	}
+}
+
 void free_pstree(struct pstree_item *root_item)
 {
 	struct pstree_item *item = root_item, *parent;