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// SPDX-License-Identifier: GPL-2.0
#include <linux/compiler.h>
#include <stdio.h>
#include <sys/mman.h>
#include <unistd.h>
#include "../tests.h"
static int page_fault_loop(int argc __maybe_unused, const char **argv __maybe_unused)
{
size_t size = getpagesize();
char *page;
int ret = 1;
page = mmap(NULL, size, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (page == MAP_FAILED) {
perror("mmap");
return 1;
}
for (int i = 0; i < 256; i++) {
/* Drop the PTE so the kernel must resolve a fault on each read. */
if (madvise(page, size, MADV_DONTNEED)) {
perror("madvise");
goto out;
}
if (READ_ONCE(*page)) {
fprintf(stderr, "Anonymous page is not zero-filled\n");
goto out;
}
}
ret = 0;
out:
munmap(page, size);
return ret;
}
DEFINE_WORKLOAD(page_fault_loop);
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