[RFC PATCH V3 41/43] rv64ilp32_abi: tty: Adapt ptr_to_compat
From: guoren@kernel.org
Date: 2025-03-25 12:26:41
Also in:
bpf, kvm, kvm-riscv, linux-arch, linux-btrfs, linux-crypto, linux-fsdevel, linux-input, linux-media, linux-mm, linux-nfs, linux-perf-users, linux-riscv, linux-sctp, linux-serial, linux-usb, lkml, netdev, netfilter-devel
Subsystem:
the rest, tty layer and serial drivers · Maintainers:
Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
From: "Guo Ren (Alibaba DAMO Academy)" <guoren@kernel.org> The RV64ILP32 ABI is based on 64-bit ISA, but BITS_PER_LONG is 32. So, the size of unsigned long is the same as compat_ulong_t and no need "(unsigned long)v.iomem_base >> 32 ? 0xfffffff : ..." detection. Signed-off-by: Guo Ren (Alibaba DAMO Academy) <guoren@kernel.org> --- drivers/tty/tty_io.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 449dbd216460..75e256e879d0 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c@@ -2873,8 +2873,12 @@ static int compat_tty_tiocgserial(struct tty_struct *tty, err = tty->ops->get_serial(tty, &v); if (!err) { memcpy(&v32, &v, offsetof(struct serial_struct32, iomem_base)); +#if BITS_PER_LONG == 64 v32.iomem_base = (unsigned long)v.iomem_base >> 32 ? 0xfffffff : ptr_to_compat(v.iomem_base); +#else + v32.iomem_base = ptr_to_compat(v.iomem_base); +#endif v32.iomem_reg_shift = v.iomem_reg_shift; v32.port_high = v.port_high; if (copy_to_user(ss, &v32, sizeof(v32)))
--
2.40.1