From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Nathan Chancellor <natechancellor@gmail.com>,
Sedat Dilek <sedat.dilek@gmail.com>, Borislav Petkov <bp@suse.de>,
Nick Desaulniers <ndesaulniers@google.com>,
Steven Rostedt <rostedt@goodmis.org>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 4.14 05/13] x86/mmiotrace: Use cpumask_available() for cpumask_var_t variables
Date: Thu, 28 May 2020 07:57:36 -0400 [thread overview]
Message-ID: <20200528115744.1406533-5-sashal@kernel.org> (raw)
In-Reply-To: <20200528115744.1406533-1-sashal@kernel.org>
From: Nathan Chancellor <natechancellor@gmail.com>
[ Upstream commit d7110a26e5905ec2fe3fc88bc6a538901accb72b ]
When building with Clang + -Wtautological-compare and
CONFIG_CPUMASK_OFFSTACK unset:
arch/x86/mm/mmio-mod.c:375:6: warning: comparison of array 'downed_cpus'
equal to a null pointer is always false [-Wtautological-pointer-compare]
if (downed_cpus == NULL &&
^~~~~~~~~~~ ~~~~
arch/x86/mm/mmio-mod.c:405:6: warning: comparison of array 'downed_cpus'
equal to a null pointer is always false [-Wtautological-pointer-compare]
if (downed_cpus == NULL || cpumask_weight(downed_cpus) == 0)
^~~~~~~~~~~ ~~~~
2 warnings generated.
Commit
f7e30f01a9e2 ("cpumask: Add helper cpumask_available()")
added cpumask_available() to fix warnings of this nature. Use that here
so that clang does not warn regardless of CONFIG_CPUMASK_OFFSTACK's
value.
Reported-by: Sedat Dilek <sedat.dilek@gmail.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Link: https://github.com/ClangBuiltLinux/linux/issues/982
Link: https://lkml.kernel.org/r/20200408205323.44490-1-natechancellor@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/x86/mm/mmio-mod.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/mm/mmio-mod.c b/arch/x86/mm/mmio-mod.c
index 4d434ddb75db..f140b2d39319 100644
--- a/arch/x86/mm/mmio-mod.c
+++ b/arch/x86/mm/mmio-mod.c
@@ -385,7 +385,7 @@ static void enter_uniprocessor(void)
int cpu;
int err;
- if (downed_cpus == NULL &&
+ if (!cpumask_available(downed_cpus) &&
!alloc_cpumask_var(&downed_cpus, GFP_KERNEL)) {
pr_notice("Failed to allocate mask\n");
goto out;
@@ -415,7 +415,7 @@ static void leave_uniprocessor(void)
int cpu;
int err;
- if (downed_cpus == NULL || cpumask_weight(downed_cpus) == 0)
+ if (!cpumask_available(downed_cpus) || cpumask_weight(downed_cpus) == 0)
return;
pr_notice("Re-enabling CPUs...\n");
for_each_cpu(cpu, downed_cpus) {
--
2.25.1
next prev parent reply other threads:[~2020-05-28 11:58 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-28 11:57 [PATCH AUTOSEL 4.14 01/13] ARC: Fix ICCM & DCCM runtime size checks Sasha Levin
2020-05-28 11:57 ` [PATCH AUTOSEL 4.14 02/13] ARC: [plat-eznps]: Restrict to CONFIG_ISA_ARCOMPACT Sasha Levin
2020-05-28 11:57 ` [PATCH AUTOSEL 4.14 03/13] i2c: altera: Fix race between xfer_msg and isr thread Sasha Levin
2020-05-28 11:57 ` [PATCH AUTOSEL 4.14 04/13] net sched: fix reporting the first-time use timestamp Sasha Levin
2020-05-28 11:57 ` Sasha Levin [this message]
2020-05-28 11:57 ` [PATCH AUTOSEL 4.14 06/13] net: bmac: Fix read of MAC address from ROM Sasha Levin
2020-05-28 11:57 ` [PATCH AUTOSEL 4.14 07/13] r8152: support additional Microsoft Surface Ethernet Adapter variant Sasha Levin
2020-05-28 11:57 ` [PATCH AUTOSEL 4.14 08/13] net/ethernet/freescale: rework quiesce/activate for ucc_geth Sasha Levin
2020-05-28 11:57 ` [PATCH AUTOSEL 4.14 09/13] net: ethernet: stmmac: Enable interface clocks on probe for IPQ806x Sasha Levin
2020-05-28 11:57 ` [PATCH AUTOSEL 4.14 10/13] net: sun: fix missing release regions in cas_init_one() Sasha Levin
2020-05-28 11:57 ` [PATCH AUTOSEL 4.14 11/13] net/mlx5: Add command entry handling completion Sasha Levin
2020-05-28 11:57 ` [PATCH AUTOSEL 4.14 12/13] net/mlx4_core: fix a memory leak bug Sasha Levin
2020-05-28 11:57 ` [PATCH AUTOSEL 4.14 13/13] net: smsc911x: Fix runtime PM imbalance on error Sasha Levin
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