Post my improvement of the test in
e4a4ba415419 ("selftests/mm:
va_high_addr_switch: dynamically initialize testcases to enable LPA2
testing"):
The test begins to fail on 4k and 16k pages, on non-LPA2 systems. To
reduce noise in the CI systems, let us skip the test when higher address
space is not implemented.
Link: https://lkml.kernel.org/r/20240718052504.356517-1-dev.jain@arm.com
Fixes: e4a4ba415419 ("selftests/mm: va_high_addr_switch: dynamically initialize testcases to enable LPA2 testing")
Signed-off-by: Dev Jain <dev.jain@arm.com>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
return ret;
}
+#ifdef __aarch64__
+/* Check if userspace VA > 48 bits */
+static int high_address_present(void)
+{
+ void *ptr = mmap((void *)(1UL << 50), 1, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
+ if (ptr == MAP_FAILED)
+ return 0;
+
+ munmap(ptr, 1);
+ return 1;
+}
+#endif
+
static int supported_arch(void)
{
#if defined(__powerpc64__)
#elif defined(__x86_64__)
return 1;
#elif defined(__aarch64__)
- return 1;
+ return high_address_present();
#else
return 0;
#endif