x86/hyperv: Fix output argument to hypercall that changes page visibility

x86/hyperv: Fix output argument to hypercall that changes page visibility

[ Upstream commit 09beefefb57bbc3a06d98f319d85db4d719d7bcb ]

The hypercall in hv_mark_gpa_visibility() is invoked with an input
argument and an output argument. The output argument ostensibly returns
the number of pages that were processed. But in fact, the hypercall does
not provide any output, so the output argument is spurious.

The spurious argument is harmless because Hyper-V ignores it, but in the
interest of correctness and to avoid the potential for future problems,
remove it.

Signed-off-by: Michael Kelley <mhklinux@outlook.com>
Reviewed-by: Nuno Das Neves <nunodasneves@linux.microsoft.com>
Link: https://lore.kernel.org/r/20250226200612.2062-2-mhklinux@outlook.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <20250226200612.2062-2-mhklinux@outlook.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>