[Qemu-devel] [PATCH] exec.c: Fix calculation of code_gen_buffer_max_size

[Peter Maydell]

When calculating the point at which we should not try to put another
TB into the code gen buffer, we have to allow not just for OPC_MAX_SIZE
but OPC_BUF_SIZE. This is because the target translate.c will only
stop when an instruction has put it past the OPC_MAX_SIZE limit, so
we have to include the MAX_OP_PER_INSTR margin which that final insn
might have used.

Signed-off-by: Peter Maydell <address@hidden>
---
 exec.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/exec.c b/exec.c
index 09928a3..c910840 100644
--- a/exec.c
+++ b/exec.c
@@ -555,8 +555,8 @@ static void code_gen_alloc(unsigned long tb_size)
 #endif
 #endif /* !USE_STATIC_CODE_GEN_BUFFER */
     map_exec(code_gen_prologue, sizeof(code_gen_prologue));
-    code_gen_buffer_max_size = code_gen_buffer_size - 
-        (TCG_MAX_OP_SIZE * OPC_MAX_SIZE);
+    code_gen_buffer_max_size = code_gen_buffer_size -
+        (TCG_MAX_OP_SIZE * OPC_BUF_SIZE);
     code_gen_max_blocks = code_gen_buffer_size / CODE_GEN_AVG_BLOCK_SIZE;
     tbs = qemu_malloc(code_gen_max_blocks * sizeof(TranslationBlock));
 }
-- 
1.7.1