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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/tools/testing/selftests/powerpc/stringloops/memcmp.c
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@@ -2,7 +2,9 @@
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 #include <malloc.h>
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 #include <stdlib.h>
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 #include <string.h>
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+#include <sys/mman.h>
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 #include <time.h>
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+
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 #include "utils.h"
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 #define SIZE 256
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@@ -12,6 +14,9 @@
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 #define LARGE_ITERATIONS 1000
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 #define LARGE_MAX_OFFSET 32
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 #define LARGE_SIZE_START 4096
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+
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+/* This is big enough to fit LARGE_SIZE and works on 4K & 64K kernels */
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+#define MAP_SIZE (64 * 1024)
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 #define MAX_OFFSET_DIFF_S1_S2 48
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@@ -68,25 +73,25 @@
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 static int testcase(bool islarge)
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 {
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-	char *s1;
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-	char *s2;
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-	unsigned long i;
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+	unsigned long i, comp_size, alloc_size;
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+	char *p, *s1, *s2;
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+	int iterations;
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-	unsigned long comp_size = (islarge ? LARGE_SIZE : SIZE);
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-	unsigned long alloc_size = comp_size + MAX_OFFSET_DIFF_S1_S2;
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-	int iterations = islarge ? LARGE_ITERATIONS : ITERATIONS;
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+	comp_size = (islarge ? LARGE_SIZE : SIZE);
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+	alloc_size = comp_size + MAX_OFFSET_DIFF_S1_S2;
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+	iterations = islarge ? LARGE_ITERATIONS : ITERATIONS;
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-	s1 = memalign(128, alloc_size);
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-	if (!s1) {
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-		perror("memalign");
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-		exit(1);
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-	}
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+	p = mmap(NULL, 4 * MAP_SIZE, PROT_READ | PROT_WRITE,
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+		 MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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+	FAIL_IF(p == MAP_FAILED);
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-	s2 = memalign(128, alloc_size);
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-	if (!s2) {
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-		perror("memalign");
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-		exit(1);
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-	}
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+	/* Put s1/s2 at the end of a page */
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+	s1 = p + MAP_SIZE - alloc_size;
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+	s2 = p + 3 * MAP_SIZE - alloc_size;
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+
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+	/* And unmap the subsequent page to force a fault if we overread */
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+	munmap(p + MAP_SIZE, MAP_SIZE);
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+	munmap(p + 3 * MAP_SIZE, MAP_SIZE);
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 	srandom(time(0));
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@@ -147,6 +152,11 @@
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 static int testcases(void)
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 {
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+#ifdef __powerpc64__
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+	// vcmpequd used in memcmp_64.S is v2.07
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+	SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_2_07));
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+#endif
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+
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 	testcase(0);
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 	testcase(1);
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 	return 0;