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| author | Arnd Bergmann <arnd@arndb.de> | 2019-07-12 11:01:21 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-08-06 19:08:09 +0200 |
| commit | 673e7696a9c093ebd33743dbca7f0bf06a231bdb (patch) | |
| tree | ea7becaa093b715232f099980918d2bda66e595f | |
| parent | 4d133cd28f4a0ce90e093f9f97b16fe8fc0962be (diff) | |
| download | linux-stable-673e7696a9c093ebd33743dbca7f0bf06a231bdb.tar.gz linux-stable-673e7696a9c093ebd33743dbca7f0bf06a231bdb.tar.bz2 linux-stable-673e7696a9c093ebd33743dbca7f0bf06a231bdb.zip | |
ACPI: fix false-positive -Wuninitialized warning
[ Upstream commit dfd6f9ad36368b8dbd5f5a2b2f0a4705ae69a323 ]
clang gets confused by an uninitialized variable in what looks
to it like a never executed code path:
arch/x86/kernel/acpi/boot.c:618:13: error: variable 'polarity' is uninitialized when used here [-Werror,-Wuninitialized]
polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
^~~~~~~~
arch/x86/kernel/acpi/boot.c:606:32: note: initialize the variable 'polarity' to silence this warning
int rc, irq, trigger, polarity;
^
= 0
arch/x86/kernel/acpi/boot.c:617:12: error: variable 'trigger' is uninitialized when used here [-Werror,-Wuninitialized]
trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
^~~~~~~
arch/x86/kernel/acpi/boot.c:606:22: note: initialize the variable 'trigger' to silence this warning
int rc, irq, trigger, polarity;
^
= 0
This is unfortunately a design decision in clang and won't be fixed.
Changing the acpi_get_override_irq() macro to an inline function
reliably avoids the issue.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | include/linux/acpi.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/acpi.h b/include/linux/acpi.h index d315d86844e4..872ab208c8ad 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -317,7 +317,10 @@ void acpi_set_irq_model(enum acpi_irq_model_id model, #ifdef CONFIG_X86_IO_APIC extern int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity); #else -#define acpi_get_override_irq(gsi, trigger, polarity) (-1) +static inline int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity) +{ + return -1; +} #endif /* * This function undoes the effect of one call to acpi_register_gsi(). |