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Date: Mon, 15 Jun 2020 12:00:47 +0800
From: Jason Yan <yanaijie@...wei.com>
To: <rjw@...ysocki.net>, <lenb@...nel.org>, <linux-acpi@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
CC: <kernel-hardening@...ts.openwall.com>, Jason Yan <yanaijie@...wei.com>,
Kees Cook <keescook@...omium.org>
Subject: [PATCH] ACPI: Eliminate usage of uninitialized_var() macro
This is an effort to eliminate the uninitialized_var() macro[1].
The use of this macro is the wrong solution because it forces off ANY
analysis by the compiler for a given variable. It even masks "unused
variable" warnings.
Quoted from Linus[2]:
"It's a horrible thing to use, in that it adds extra cruft to the
source code, and then shuts up a compiler warning (even the _reliable_
warnings from gcc)."
The gcc option "-Wmaybe-uninitialized" has been disabled and this change
will not produce any warnnings even with "make W=1".
[1] https://github.com/KSPP/linux/issues/81
[2] https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@mail.gmail.com/
Cc: Kees Cook <keescook@...omium.org>
Signed-off-by: Jason Yan <yanaijie@...wei.com>
---
drivers/acpi/acpi_pad.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
index e7dc0133f817..6cc4c92d9ff9 100644
--- a/drivers/acpi/acpi_pad.c
+++ b/drivers/acpi/acpi_pad.c
@@ -88,7 +88,7 @@ static void round_robin_cpu(unsigned int tsk_index)
cpumask_var_t tmp;
int cpu;
unsigned long min_weight = -1;
- unsigned long uninitialized_var(preferred_cpu);
+ unsigned long preferred_cpu;
if (!alloc_cpumask_var(&tmp, GFP_KERNEL))
return;
--
2.25.4
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