From: Andrey Smirnov <andrew.smirnov@gmail.com>
To: barebox@lists.infradead.org
Cc: Andrey Smirnov <andrew.smirnov@gmail.com>,
Chris Healy <cphealy@gmail.com>,
Heiner Kallweit <hkallweit1@gmail.com>
Subject: [PATCH 3/3] ARM: zii-imx8mq-dev: Drop unnecessary barrier() in switch statement
Date: Sun, 14 Apr 2019 17:21:21 -0700 [thread overview]
Message-ID: <20190415002121.15988-3-andrew.smirnov@gmail.com> (raw)
In-Reply-To: <20190415002121.15988-1-andrew.smirnov@gmail.com>
AArch64 uses PC-relative addressing instead of absolute one for data
lookups, so compiling switch statement into a LUT shouldn't be a
problem regardless if relocation happened or not. Disassembly of PBL
code looks almost exactly the same with or without this workaround, so
it is clearly not needed. Drop it.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Heiner Kallweit <hkallweit1@gmail.com>
Cc: Chris Healy <cphealy@gmail.com>
---
arch/arm/boards/zii-imx8mq-dev/lowlevel.c | 7 -------
1 file changed, 7 deletions(-)
diff --git a/arch/arm/boards/zii-imx8mq-dev/lowlevel.c b/arch/arm/boards/zii-imx8mq-dev/lowlevel.c
index 0fd2ddfca..33c007e05 100644
--- a/arch/arm/boards/zii-imx8mq-dev/lowlevel.c
+++ b/arch/arm/boards/zii-imx8mq-dev/lowlevel.c
@@ -179,13 +179,6 @@ ENTRY_FUNCTION(start_zii_imx8mq_dev, r0, r1, r2)
switch (system_type) {
default:
- /*
- * see similar code in
- * arch/arm/boards/zii-vf610-dev/lowlevel.c for
- * reasoning for placing barrier() below.
- */
- barrier();
-
if (IS_ENABLED(CONFIG_DEBUG_LL)) {
relocate_to_current_adr();
setup_c();
--
2.20.1
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next prev parent reply other threads:[~2019-04-15 0:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-15 0:21 [PATCH 1/3] ARM: zii-vf610-dev: Use -fno-tree-switch-conversion -fno-jump-tables Andrey Smirnov
2019-04-15 0:21 ` [PATCH 2/3] ARM: zii-imx51-rdu1: " Andrey Smirnov
2019-04-15 0:21 ` Andrey Smirnov [this message]
2019-04-23 9:33 ` [PATCH 1/3] ARM: zii-vf610-dev: " Sascha Hauer
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