kernel/tools/testing/selftests/powerpc/mm/stack_expansion_ldst.c, branch linux-6.2.y

selftests/powerpc: Remove powerpc special cases from stack expansion test

2020-07-29T11:02:12Z

Now that the powerpc code behaves the same as other architectures we can drop the special cases we had. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200724092528.1578671-5-mpe@ellerman.id.au

selftests/powerpc: Update the stack expansion test

2020-07-29T11:02:12Z

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 Link: https://lore.kernel.org/r/20200724092528.1578671-3-mpe@ellerman.id.au

selftests/powerpc: Add test of stack expansion logic

2020-07-29T11:02:11Z

We have custom stack expansion checks that it turns out are extremely badly tested and contain bugs, surprise. So add some tests that exercise the code and capture the current boundary conditions. The signal test currently fails on 64-bit kernels because the 2048 byte allowance for the signal frame is too small, we will fix that in a subsequent patch. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200724092528.1578671-1-mpe@ellerman.id.au