Viewing file:  pr18241-2.c (1.18 KB) -rw-r--r--
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/* { dg-do run } */
/* { dg-options "-std=gnu99 -Wall -Wextra -O1" } */
extern void *memset (void*, int, __SIZE_TYPE__);
extern void abort (void);
struct radix_tree_root {
unsigned int height;
struct radix_tree_node *rnode;
};
struct radix_tree_node {
unsigned int count;
void *slots[64];
unsigned long tags[2];
};
struct radix_tree_path {
struct radix_tree_node *node, **slot;
int offset;
};
void radix_tree_tag_clear(struct radix_tree_root *root, unsigned long index)
{
struct radix_tree_path path[7], *pathp = path;
unsigned int height, shift;
volatile unsigned long *addr;
height = root->height;
shift = (height - 1) * 6;
path[0].slot = &root->rnode;
while (height > 0) {
int offset;
offset = (index >> shift) & (64-1);
pathp[1].offset = offset;
pathp[1].node = *pathp[0].slot;
pathp[1].slot = (struct radix_tree_node **)
(pathp[1].node->slots + offset);
pathp++;
shift -= 6;
height--;
}
addr = &(pathp->node->tags[0]) + 1;
*addr = 574;
}
struct radix_tree_root r;
struct radix_tree_node node;
int main ()
{
r.height = 1;
r.rnode = &node;
memset (&node, 0, sizeof (node));
node.count = 1;
radix_tree_tag_clear (&r, 13);
return 0;
}
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