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Message-Id: <20240719115727.27857-1-limiao870622@163.com>
Date: Fri, 19 Jul 2024 19:57:27 +0800
From: limiao <limiao870622@....com>
To: mturquette@...libre.com,
sboyd@...nel.org,
unicorn_wang@...look.com,
inochiama@...look.com,
limiao870622@....com
Cc: linux-clk@...r.kernel.org,
linux-kernel@...r.kernel.org,
limiao <limiao@...inos.cn>
Subject: [PATCH] clk: sophgo: fix warning emitted by objtool
From: limiao <limiao@...inos.cn>
for ARCH=x86, the combination of CONFIG_OBJTOOL=y enables
a host tool named 'objtool' which runs at compile time,
when CONFIG_CLK_SOPHGO_CV1800=y or m, objtool will produces
the following warning:
drivers/clk/sophgo/clk-cv18xx-ip.o: warning: objtool:
mmux_round_rate() falls through to next function aclk_set_rate()
we can find the reason from objtool help document(tools/objtool/
Documentation/objtool.txt):
Objtool warnings
----------------
...
8. file.o: warning: objtool: funcA() falls through to next function funcB()
...
2) funcA() uses the unreachable() annotation in a section of code
that is actually reachable.
so we replace unreachable() with returning an errno to avoid this warning.
Signed-off-by: limiao<limiao@...inos.cn>
---
drivers/clk/sophgo/clk-cv18xx-ip.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/sophgo/clk-cv18xx-ip.c b/drivers/clk/sophgo/clk-cv18xx-ip.c
index 805f561725ae..0fe9a9bd3f49 100644
--- a/drivers/clk/sophgo/clk-cv18xx-ip.c
+++ b/drivers/clk/sophgo/clk-cv18xx-ip.c
@@ -602,7 +602,7 @@ static inline struct cv1800_clk_mmux *hw_to_cv1800_clk_mmux(struct clk_hw *hw)
return container_of(common, struct cv1800_clk_mmux, common);
}
-static u8 mmux_get_parent_id(struct cv1800_clk_mmux *mmux)
+static int mmux_get_parent_id(struct cv1800_clk_mmux *mmux)
{
struct clk_hw *hw = &mmux->common.hw;
struct clk_hw *parent = clk_hw_get_parent(hw);
@@ -613,7 +613,7 @@ static u8 mmux_get_parent_id(struct cv1800_clk_mmux *mmux)
return i;
}
- unreachable();
+ return -EINVAL;
}
static int mmux_enable(struct clk_hw *hw)
@@ -648,6 +648,8 @@ static long mmux_round_rate(struct clk_hw *parent, unsigned long *parent_rate,
return *parent_rate;
id = mmux_get_parent_id(mmux);
+ if (id < 0)
+ return *parent_rate;
}
div_id = mmux->parent2sel[id];
--
2.25.1
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