linux-kernel - [PATCH] powerpc/maple: Fix declaration made after definition

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Date:   Mon, 23 Mar 2020 15:27:29 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Ilie Halip <ilie.halip@...il.com>
Subject: [PATCH] powerpc/maple: Fix declaration made after definition

When building ppc64 defconfig, Clang errors (trimmed for brevity):

arch/powerpc/platforms/maple/setup.c:365:1: error: attribute declaration
must precede definition [-Werror,-Wignored-attributes]
machine_device_initcall(maple, maple_cpc925_edac_setup);
^

machine_device_initcall expands to __define_machine_initcall, which in
turn has the macro machine_is used in it, which declares mach_##name
with an __attribute__((weak)). define_machine actually defines
mach_##name, which in this file happens before the declaration, hence
the warning.

To fix this, move define_machine after machine_device_initcall so that
the declaration occurs before the definition, which matches how
machine_device_initcall and define_machine work throughout arch/powerpc.

While we're here, remove some spaces before tabs.

Fixes: 8f101a051ef0 ("edac: cpc925 MC platform device setup")
Link: https://godbolt.org/z/kDoYSA
Link: https://github.com/ClangBuiltLinux/linux/issues/662
Reported-by: Nick Desaulniers <ndesaulniers@...gle.com>
Suggested-by: Ilie Halip <ilie.halip@...il.com>
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---
 arch/powerpc/platforms/maple/setup.c | 34 ++++++++++++++--------------
 1 file changed, 17 insertions(+), 17 deletions(-)

diff --git a/arch/powerpc/platforms/maple/setup.c b/arch/powerpc/platforms/maple/setup.c
index 6f019df37916..15b2c6eb506d 100644
--- a/arch/powerpc/platforms/maple/setup.c
+++ b/arch/powerpc/platforms/maple/setup.c
@@ -291,23 +291,6 @@ static int __init maple_probe(void)
 	return 1;
 }
 
-define_machine(maple) {
-	.name			= "Maple",
-	.probe			= maple_probe,
-	.setup_arch		= maple_setup_arch,
-	.init_IRQ		= maple_init_IRQ,
-	.pci_irq_fixup		= maple_pci_irq_fixup,
-	.pci_get_legacy_ide_irq	= maple_pci_get_legacy_ide_irq,
-	.restart		= maple_restart,
-	.halt			= maple_halt,
-       	.get_boot_time		= maple_get_boot_time,
-       	.set_rtc_time		= maple_set_rtc_time,
-       	.get_rtc_time		= maple_get_rtc_time,
-      	.calibrate_decr		= generic_calibrate_decr,
-	.progress		= maple_progress,
-	.power_save		= power4_idle,
-};
-
 #ifdef CONFIG_EDAC
 /*
  * Register a platform device for CPC925 memory controller on
@@ -364,3 +347,20 @@ static int __init maple_cpc925_edac_setup(void)
 }
 machine_device_initcall(maple, maple_cpc925_edac_setup);
 #endif
+
+define_machine(maple) {
+	.name			= "Maple",
+	.probe			= maple_probe,
+	.setup_arch		= maple_setup_arch,
+	.init_IRQ		= maple_init_IRQ,
+	.pci_irq_fixup		= maple_pci_irq_fixup,
+	.pci_get_legacy_ide_irq	= maple_pci_get_legacy_ide_irq,
+	.restart		= maple_restart,
+	.halt			= maple_halt,
+	.get_boot_time		= maple_get_boot_time,
+	.set_rtc_time		= maple_set_rtc_time,
+	.get_rtc_time		= maple_get_rtc_time,
+	.calibrate_decr		= generic_calibrate_decr,
+	.progress		= maple_progress,
+	.power_save		= power4_idle,
+};
-- 
2.26.0