linux-kernel - [PATCH] xen: Fix implicit type conversion

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Message-Id: <1635218868-2437564-1-git-send-email-jiasheng@iscas.ac.cn>
Date:   Tue, 26 Oct 2021 03:27:48 +0000
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     boris.ostrovsky@...cle.com, jgross@...e.com, sstabellini@...nel.org
Cc:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] xen: Fix implicit type conversion

The variable 'i' is defined as UINT.
However in the for_each_possible_cpu, its value is assigned to -1.
That doesn't make sense and in the cpumask_next() it is implicitly
type conversed to INT.
It is universally accepted that the implicit type conversion is
terrible.
Also, having the good programming custom will set an example for
others.
Thus, it might be better to change the definition of 'i' from UINT
to INT.

Fixes: 3fac101 ("xen: Re-upload processor PM data to hypervisor after S3 resume (v2)")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/xen/xen-acpi-processor.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/xen/xen-acpi-processor.c b/drivers/xen/xen-acpi-processor.c
index df7cab8..2551691 100644
--- a/drivers/xen/xen-acpi-processor.c
+++ b/drivers/xen/xen-acpi-processor.c
@@ -518,7 +518,7 @@ static struct syscore_ops xap_syscore_ops = {
 
 static int __init xen_acpi_processor_init(void)
 {
-	unsigned int i;
+	int i;
 	int rc;
 
 	if (!xen_initial_domain())
-- 
2.7.4