linux-kernel - [PATCH 3/5] selftests/powerpc: Update the stack expansion test

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Date:   Sat,  4 Jul 2020 00:13:25 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     linuxppc-dev@...abs.org
Cc:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        hughd@...gle.com
Subject: [PATCH 3/5] selftests/powerpc: Update the stack expansion test

Update the stack expansion load/store test to take into account the
new allowance of 4096 bytes below the stack pointer.

Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
---
 .../selftests/powerpc/mm/stack_expansion_ldst.c        | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/powerpc/mm/stack_expansion_ldst.c b/tools/testing/selftests/powerpc/mm/stack_expansion_ldst.c
index 0587e11437f5..95c3f3de16a1 100644
--- 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 4096 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, -4096, type) == 0);
 #ifdef __powerpc__
-	assert(test_one(1 * _MB + page_size - 128, -2049, type) != 0);
+	assert(test_one(1 * _MB + page_size - 128, -4097, type) != 0);
 #else
-	assert(test_one(1 * _MB + page_size - 128, -2049, type) == 0);
+	assert(test_one(1 * _MB + page_size - 128, -4097, 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, -4096, type) == 0);
 }
 
 static int test(void)
-- 
2.25.1