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xen/gntalloc: make grant counters unsigned

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The module limit and current allocation count cannot validly be
negative. Give both variables unsigned types so their representation
matches the u32 grant count supplied through the ioctl and negative
module parameter values are rejected by parameter parsing.

This also prepares the limit check for overflow-safe unsigned
arithmetic.

Signed-off-by: Yousef Alhouseen <alhouseenyousef@gmail.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Message-ID: <20260626223805.43781-2-alhouseenyousef@gmail.com>
This commit is contained in:
Yousef Alhouseen 2026-06-27 00:38:04 +02:00 committed by Juergen Gross
parent 678d59219c
commit 51d111301a
1 changed files with 3 additions and 3 deletions
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6
drivers/xen/gntalloc.c
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@ -70,14 +70,14 @@
#include <xen/gntalloc.h>
#include <xen/events.h>
static int limit = 1024;
module_param(limit, int, 0644);
static unsigned int limit = 1024;
module_param(limit, uint, 0644);
MODULE_PARM_DESC(limit, "Maximum number of grants that may be allocated by "
"the gntalloc device");
static LIST_HEAD(gref_list);
static DEFINE_MUTEX(gref_mutex);
static int gref_size;
static unsigned int gref_size;
struct notify_info {
uint16_t pgoff:12; /* Bits 0-11: Offset of the byte to clear */