Re: [Qemu-devel] [PATCH] m68k: Build the opcode table only once to avoid multithreading issues

[John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

On 02/03/2016 04:16 PM, Eric Blake wrote:
> Missing {}.  Are you sure this is the version that passed
> checkpatch.pl?

Yes:

glaubitz@z6:..qemu/target-m68k> ../scripts/checkpatch.pl
0002-m68k-Build-the-opcode-table-only-once-to-avoid-multi.patch
total: 0 errors, 0 warnings, 10 lines checked

0002-m68k-Build-the-opcode-table-only-once-to-avoid-multi.patch has no
obvious style problems and is ready for submission.
glaubitz@z6:..qemu/target-m68k> cat
0002-m68k-Build-the-opcode-table-only-once-to-avoid-multi.patch
- From 2d8ef8d0244db95e41e04ff909560f12676e1dec Mon Sep 17 00:00:00 2001
From: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Date: Wed, 3 Feb 2016 10:22:35 +0100
Subject: [PATCH 2/2] m68k: Build the opcode table only once to avoid
 multithreading issues

Signed-off-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
- ---
 target-m68k/translate.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/target-m68k/translate.c b/target-m68k/translate.c
index 535d7f9..a989961 100644
- --- a/target-m68k/translate.c
+++ b/target-m68k/translate.c
@@ -2828,6 +2828,10 @@ register_opcode (disas_proc proc, uint16_t
opcode, uint16_t mask)
    Later insn override earlier ones.  */
 void register_m68k_insns (CPUM68KState *env)
 {
+    /* Build the opcode table only once to avoid
+       multithreading issues. */
+    if (opcode_table[0] != NULL)
+        return;
 #define INSN(name, opcode, mask, feature) do { \
     if (m68k_feature(env, M68K_FEATURE_##feature)) \
         register_opcode(disas_##name, 0x##opcode, 0x##mask); \
- -- 
2.7.0

glaubitz@z6:..qemu/target-m68k>

- -- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@debian.org
`. `'   Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2
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=L8Yn
-----END PGP SIGNATURE-----