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riscv: mm: Fixup compat mode boot failure
commit5f449e245e
upstream. In COMPAT mode, the STACK_TOP is DEFAULT_MAP_WINDOW (0x80000000), but the TASK_SIZE is 0x7fff000. When the user stack is upon 0x7fff000, it will cause a user segment fault. Sometimes, it would cause boot failure when the whole rootfs is rv32. Freeing unused kernel image (initmem) memory: 2236K Run /sbin/init as init process Starting init: /sbin/init exists but couldn't execute it (error -14) Run /etc/init as init process ... Increase the TASK_SIZE to cover STACK_TOP. Cc: stable@vger.kernel.org Fixes:add2cc6b65
("RISC-V: mm: Restrict address space for sv39,sv48,sv57") Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@kernel.org> Reviewed-by: Leonardo Bras <leobras@redhat.com> Reviewed-by: Charlie Jenkins <charlie@rivosinc.com> Link: https://lore.kernel.org/r/20231222115703.2404036-2-guoren@kernel.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -880,7 +880,7 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte)
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#define TASK_SIZE_MIN (PGDIR_SIZE_L3 * PTRS_PER_PGD / 2)
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#ifdef CONFIG_COMPAT
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#define TASK_SIZE_32 (_AC(0x80000000, UL) - PAGE_SIZE)
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#define TASK_SIZE_32 (_AC(0x80000000, UL))
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#define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
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TASK_SIZE_32 : TASK_SIZE_64)
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#else
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