linux/arch/x86/kernel/pci-iommu_table.c
Zhong Jiang 0b2c1aec49 x86/iommu: Use NULL instead of 0
Fixes the following sparse warning:

arch/x86/kernel/pci-iommu_table.c:63:37: warning: Using plain integer as NULL pointer

Signed-off-by: zhong jiang <zhongjiang@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: <hpa@zytor.com>
Cc: <gregkh@linuxfoundation.org>
Link: https://lkml.kernel.org/r/1532162004-24670-1-git-send-email-zhongjiang@huawei.com
2018-08-02 14:33:19 +02:00

81 lines
1.8 KiB
C

// SPDX-License-Identifier: GPL-2.0
#include <linux/dma-mapping.h>
#include <asm/iommu_table.h>
#include <linux/string.h>
#include <linux/kallsyms.h>
#define DEBUG 1
static struct iommu_table_entry * __init
find_dependents_of(struct iommu_table_entry *start,
struct iommu_table_entry *finish,
struct iommu_table_entry *q)
{
struct iommu_table_entry *p;
if (!q)
return NULL;
for (p = start; p < finish; p++)
if (p->detect == q->depend)
return p;
return NULL;
}
void __init sort_iommu_table(struct iommu_table_entry *start,
struct iommu_table_entry *finish) {
struct iommu_table_entry *p, *q, tmp;
for (p = start; p < finish; p++) {
again:
q = find_dependents_of(start, finish, p);
/* We are bit sneaky here. We use the memory address to figure
* out if the node we depend on is past our point, if so, swap.
*/
if (q > p) {
tmp = *p;
memmove(p, q, sizeof(*p));
*q = tmp;
goto again;
}
}
}
#ifdef DEBUG
void __init check_iommu_entries(struct iommu_table_entry *start,
struct iommu_table_entry *finish)
{
struct iommu_table_entry *p, *q, *x;
/* Simple cyclic dependency checker. */
for (p = start; p < finish; p++) {
q = find_dependents_of(start, finish, p);
x = find_dependents_of(start, finish, q);
if (p == x) {
printk(KERN_ERR "CYCLIC DEPENDENCY FOUND! %pS depends on %pS and vice-versa. BREAKING IT.\n",
p->detect, q->detect);
/* Heavy handed way..*/
x->depend = NULL;
}
}
for (p = start; p < finish; p++) {
q = find_dependents_of(p, finish, p);
if (q && q > p) {
printk(KERN_ERR "EXECUTION ORDER INVALID! %pS should be called before %pS!\n",
p->detect, q->detect);
}
}
}
#else
void __init check_iommu_entries(struct iommu_table_entry *start,
struct iommu_table_entry *finish)
{
}
#endif