[PATCH v3 17/35] arch_init: factor out logic to find ram block with id string

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
 arch_init.c |   31 ++++++++++++++++++++-----------
 arch_init.h |    1 +
 exec.c      |   12 ++++++------
 3 files changed, 27 insertions(+), 17 deletions(-)

diff --git a/arch_init.c b/arch_init.c
index c77e24d..d82316d 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -762,6 +762,19 @@ static int load_xbzrle(QEMUFile *f, void *host)
     return rc;
 }
 
+RAMBlock *ram_find_block(const char *id, uint8_t len)
+{
+    RAMBlock *block;
+
+    QLIST_FOREACH(block, &ram_list.blocks, next) {
+        if (!strncmp(id, block->idstr, len)) {
+            return block;
+        }
+    }
+
+    return NULL;
+}
+
 static inline void *host_from_stream_offset(QEMUFile *f,
                                             ram_addr_t offset,
                                             int flags)
@@ -783,9 +796,9 @@ static inline void *host_from_stream_offset(QEMUFile *f,
     qemu_get_buffer(f, (uint8_t *)id, len);
     id[len] = 0;
 
-    QLIST_FOREACH(block, &ram_list.blocks, next) {
-        if (!strncmp(id, block->idstr, sizeof(id)))
-            return memory_region_get_ram_ptr(block->mr) + offset;
+    block = ram_find_block(id, len);
+    if (block) {
+        return memory_region_get_ram_ptr(block->mr) + offset;
     }
 
     fprintf(stderr, "Can't find block %s!\n", id);
@@ -807,19 +820,15 @@ int ram_load_mem_size(QEMUFile *f, ram_addr_t total_ram_bytes)
         id[len] = 0;
         length = qemu_get_be64(f);
 
-        QLIST_FOREACH(block, &ram_list.blocks, next) {
-            if (!strncmp(id, block->idstr, sizeof(id))) {
-                if (block->length != length)
-                    return -EINVAL;
-                break;
-            }
-        }
-
+        block = ram_find_block(id, len);
         if (!block) {
             fprintf(stderr, "Unknown ramblock \"%s\", cannot "
                     "accept migration\n", id);
             return -EINVAL;
         }
+        if (block->length != length) {
+            return -EINVAL;
+        }
 
         total_ram_bytes -= length;
     }
diff --git a/arch_init.h b/arch_init.h
index bca1a29..499d0f1 100644
--- a/arch_init.h
+++ b/arch_init.h
@@ -51,6 +51,7 @@ int ram_load_page(QEMUFile *f, void *host, int flags);
 #if defined(NEED_CPU_H) && !defined(CONFIG_USER_ONLY)
 bool ram_save_page(QEMUFile *f, RAMBlock *block, ram_addr_t offset,
                    bool last_stage);
+RAMBlock *ram_find_block(const char *id, uint8_t len);
 int ram_load_mem_size(QEMUFile *f, ram_addr_t total_ram_bytes);
 #endif
 
diff --git a/exec.c b/exec.c
index 1414654..2aa4d90 100644
--- a/exec.c
+++ b/exec.c
@@ -33,6 +33,7 @@
 #include "kvm.h"
 #include "hw/xen.h"
 #include "qemu-timer.h"
+#include "arch_init.h"
 #include "memory.h"
 #include "exec-memory.h"
 #if defined(CONFIG_USER_ONLY)
@@ -2517,12 +2518,11 @@ void qemu_ram_set_idstr(ram_addr_t addr, const char *name, DeviceState *dev)
     pstrcat(new_block->idstr, sizeof(new_block->idstr), name);
 
     qemu_mutex_lock_ramlist();
-    QLIST_FOREACH(block, &ram_list.blocks, next) {
-        if (block != new_block && !strcmp(block->idstr, new_block->idstr)) {
-            fprintf(stderr, "RAMBlock \"%s\" already registered, abort!\n",
-                    new_block->idstr);
-            abort();
-        }
+    block = ram_find_block(new_block->idstr, strlen(new_block->idstr));
+    if (block != new_block) {
+        fprintf(stderr, "RAMBlock \"%s\" already registered, abort!\n",
+                new_block->idstr);
+        abort();
     }
     qemu_mutex_unlock_ramlist();
 }
-- 
1.7.10.4

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