core: introduced the macro CORE_THREAD_INFO to access the machine-specific part of CoreEntry

This is the merge and a slight rework (no TI_SP macro) of Alexander's patches
about the subj.
Signed-off-by: Alexander Kartashov <alekskartashov@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

arch/x86/include/asm/types.h

@@ -274,4 +274,6 @@ typedef struct {
 # define AT_VECTOR_SIZE 22             /* Not needed at moment */
 #endif
 
+#define CORE_THREAD_ARCH_INFO(core) core->thread_info
+
 #endif /* __CR_ASM_TYPES_H__ */

cr-dump.c

@@ -818,7 +818,7 @@ static int dump_task_core_all(pid_t pid, const struct proc_pid_stat *stat,
 	if (ret)
 		goto err_free;
 
-	mark_stack_vma(core->thread_info->gpregs->sp, vma_area_list);
+	mark_stack_vma(CORE_THREAD_ARCH_INFO(core)->gpregs->sp, vma_area_list);
 
 	ret = get_task_futex_robust_list(pid, core->thread_core);
 	if (ret)

cr-restore.c

@@ -722,7 +722,7 @@ static int check_core(CoreEntry *core)
 			goto out;
 		}
 
-		if (!core->thread_info) {
+		if (!CORE_THREAD_ARCH_INFO(core)) {
 			pr_err("Core info data missed for non-zombie\n");
 			goto out;
 		}
@@ -1838,8 +1838,8 @@ static int sigreturn_restore(pid_t pid, CoreEntry *core)
 		}
 
 		thread_args[i].ta		= task_args;
-		thread_args[i].gpregs		= *tcore->thread_info->gpregs;
-		thread_args[i].clear_tid_addr	= tcore->thread_info->clear_tid_addr;
+		thread_args[i].gpregs		= *CORE_THREAD_ARCH_INFO(tcore)->gpregs;
+		thread_args[i].clear_tid_addr	= CORE_THREAD_ARCH_INFO(tcore)->clear_tid_addr;
 		core_get_tls(tcore, &thread_args[i].tls);
 
 		if (tcore->thread_core) {

parasite-syscall.c

@@ -361,7 +361,7 @@ int parasite_dump_thread_seized(struct parasite_ctl *ctl, struct pid *tid,
 	ret = parasite_execute_by_pid(PARASITE_CMD_DUMP_THREAD, ctl, tid->real);
 
 	memcpy(&core->thread_core->blk_sigset, &args->blocked, sizeof(args->blocked));
-	core->thread_info->clear_tid_addr = (u64)args->tid_addr;
+	CORE_THREAD_ARCH_INFO(core)->clear_tid_addr = (u64)args->tid_addr;
 	tid->virt = args->tid;
 	core_put_tls(core, args->tls);