selftests/powerpc: Update the stack expansion test

Update the stack expansion load/store test to take into account the
new allowance of 4224 bytes below the stack pointer.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200724092528.1578671-3-mpe@ellerman.id.au

diff --git a/tools/testing/selftests/powerpc/mm/stack_expansion_ldst.c b/tools/testing/selftests/powerpc/mm/stack_expansion_ldst.c
index 0587e11..8dbfb51 100644 (file)
--- a/tools/testing/selftests/powerpc/mm/stack_expansion_ldst.c
+++ b/tools/testing/selftests/powerpc/mm/stack_expansion_ldst.c
@@ -186,17 +186,17 @@ static void test_one_type(enum access_type type, unsigned long page_size, unsign
        // But if we go past the rlimit it should fail
        assert(test_one(DEFAULT_SIZE, rlim_cur + 1, type) != 0);
 
-       // Above 1MB powerpc only allows accesses within 2048 bytes of
+       // Above 1MB powerpc only allows accesses within 4224 bytes of
        // r1 for accesses that aren't stdu
-       assert(test_one(1 * _MB + page_size - 128, -2048, type) == 0);
+       assert(test_one(1 * _MB + page_size - 128, -4224, type) == 0);
 #ifdef __powerpc__
-       assert(test_one(1 * _MB + page_size - 128, -2049, type) != 0);
+       assert(test_one(1 * _MB + page_size - 128, -4225, type) != 0);
 #else
-       assert(test_one(1 * _MB + page_size - 128, -2049, type) == 0);
+       assert(test_one(1 * _MB + page_size - 128, -4225, type) == 0);
 #endif
 
        // By consuming 2MB of stack we test the stdu case
-       assert(test_one(2 * _MB + page_size - 128, -2048, type) == 0);
+       assert(test_one(2 * _MB + page_size - 128, -4224, type) == 0);
 }
 
 static int test(void)