add boot partition size

hc

2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d

 kernel/tools/testing/selftests/proc/proc-self-map-files-002.c
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@@ -46,12 +46,13 @@
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 int main(void)
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 {
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-	const unsigned int PAGE_SIZE = sysconf(_SC_PAGESIZE);
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-#ifdef __arm__
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-	unsigned long va = 2 * PAGE_SIZE;
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-#else
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-	unsigned long va = 0;
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-#endif
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+	const int PAGE_SIZE = sysconf(_SC_PAGESIZE);
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+	/*
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+	 * va_max must be enough bigger than vm.mmap_min_addr, which is
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+	 * 64KB/32KB by default. (depends on CONFIG_LSM_MMAP_MIN_ADDR)
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+	 */
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+	const unsigned long va_max = 1UL << 20;
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+	unsigned long va;
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 	void *p;
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 	int fd;
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 	unsigned long a, b;
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@@ -60,10 +61,13 @@
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 	if (fd == -1)
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 		return 1;
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-	p = mmap((void *)va, PAGE_SIZE, PROT_NONE, MAP_PRIVATE|MAP_FILE|MAP_FIXED, fd, 0);
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-	if (p == MAP_FAILED) {
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-		if (errno == EPERM)
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-			return 2;
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+	for (va = 0; va < va_max; va += PAGE_SIZE) {
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+		p = mmap((void *)va, PAGE_SIZE, PROT_NONE, MAP_PRIVATE|MAP_FILE|MAP_FIXED, fd, 0);
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+		if (p == (void *)va)
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+			break;
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+	}
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+	if (va == va_max) {
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+		fprintf(stderr, "error: mmap doesn't like you\n");
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 		return 1;
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 	}
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