checkpatch: suggest qemu_real_host_page_size instead of getpagesize() or sysconf(_SC_PAGESIZE)

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
CC: Richard Henderson <richard.henderson@linaro.org>
CC: Stefan Hajnoczi <stefanha@redhat.com>

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20191017004633.13229-1-richardw.yang@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

scripts/checkpatch.pl

@@ -2915,6 +2915,12 @@ sub process {
 		if ($line =~ /\bbzero\(/) {
 			ERROR("use memset() instead of bzero()\n" . $herecurr);
 		}
+		if ($line =~ /\bgetpagesize\(\)/) {
+			ERROR("use qemu_real_host_page_size instead of getpagesize()\n" . $herecurr);
+		}
+		if ($line =~ /\bsysconf\(_SC_PAGESIZE\)/) {
+			ERROR("use qemu_real_host_page_size instead of sysconf(_SC_PAGESIZE)\n" . $herecurr);
+		}
 		my $non_exit_glib_asserts = qr{g_assert_cmpstr|
 						g_assert_cmpint|
 						g_assert_cmpuint|