linux-kernel - [PATCH] clk: qcom: gpucc-sm8350: Fix "initializer element is not constant" error

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Message-Id: <20220711163021.152578-1-nathan@kernel.org>
Date:   Mon, 11 Jul 2022 09:30:21 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Robert Foss <robert.foss@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        Nathan Chancellor <nathan@...nel.org>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH] clk: qcom: gpucc-sm8350: Fix "initializer element is not constant" error

When building with clang or GCC older than 8, errors along the following
lines occur:

  drivers/clk/qcom/gpucc-sm8350.c:111:2: error: initializer element is not a compile-time constant
          gpu_cc_parent,
          ^~~~~~~~~~~~~
  drivers/clk/qcom/gpucc-sm8350.c:126:2: error: initializer element is not a compile-time constant
          gpu_cc_parent,
          ^~~~~~~~~~~~~
  2 errors generated.

The C standard allows an implementation to accept other forms of
constant expressions, which GCC 8+ has chosen to do, but it is not
required. To fix this error with clang and older supported versions of
GCC, use a macro so that the expression can be used in a designated
initializer.

Fixes: 160758b05ab1 ("clk: qcom: add support for SM8350 GPUCC")
Link: https://github.com/ClangBuiltLinux/linux/issues/1660
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Nathan Chancellor <nathan@...nel.org>
---
 drivers/clk/qcom/gpucc-sm8350.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/clk/qcom/gpucc-sm8350.c b/drivers/clk/qcom/gpucc-sm8350.c
index d13fa813d190..9390723f6e40 100644
--- a/drivers/clk/qcom/gpucc-sm8350.c
+++ b/drivers/clk/qcom/gpucc-sm8350.c
@@ -51,9 +51,9 @@ static const struct alpha_pll_config gpu_cc_pll0_config = {
 	.user_ctl_hi1_val = 0x00000000,
 };
 
-static const struct clk_parent_data gpu_cc_parent = {
-	.fw_name = "bi_tcxo",
-};
+#define GPU_CC_PARENT_INIT { .fw_name = "bi_txco", }
+
+static const struct clk_parent_data gpu_cc_parent = GPU_CC_PARENT_INIT;
 
 static struct clk_alpha_pll gpu_cc_pll0 = {
 	.offset = 0x0,
@@ -108,7 +108,7 @@ static const struct parent_map gpu_cc_parent_map_0[] = {
 };
 
 static const struct clk_parent_data gpu_cc_parent_data_0[] = {
-	gpu_cc_parent,
+	GPU_CC_PARENT_INIT,
 	{ .hw = &gpu_cc_pll0.clkr.hw },
 	{ .hw = &gpu_cc_pll1.clkr.hw },
 	{ .fw_name = "gcc_gpu_gpll0_clk_src" },
@@ -123,7 +123,7 @@ static const struct parent_map gpu_cc_parent_map_1[] = {
 };
 
 static const struct clk_parent_data gpu_cc_parent_data_1[] = {
-	gpu_cc_parent,
+	GPU_CC_PARENT_INIT,
 	{ .hw = &gpu_cc_pll1.clkr.hw },
 	{ .fw_name = "gcc_gpu_gpll0_clk_src" },
 	{ .fw_name = "gcc_gpu_gpll0_div_clk_src" },

base-commit: 0dd8e16bfbc003b009f843e75fae4046daa08fe9
-- 
2.37.0