acpi/x86: introduce __apci_map_table, v4

to prevent wrongly overwriting fixmap that still want to use.

ACPI used to rely on low mappings being all linearly mapped and
grew a habit: it never really unmapped certain kinds of tables
after use.

This can cause problems - for example the hypothetical case
when some spurious access still references it.

v2: remove prev_map and prev_size in __apci_map_table
v3: let acpi_os_unmap_memory() call early_iounmap too, so remove extral calling to
early_acpi_os_unmap_memory
v4: fix typo in one acpi_get_table_with_size calling

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Acked-by: Len Brown <len.brown@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 6 deletions

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index fb1be7b5dbc1..765fd1c56cd6 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -694,12 +694,6 @@ void __init acpi_early_init(void)
         if (!acpi_strict)
                 acpi_gbl_enable_interpreter_slack = TRUE;
 
-        /*
-         * Doing a zero-sized mapping will clear out the previous
-         * __acpi_map_table() mapping, if any.
-         */
-        __acpi_map_table(0, 0);
-
         acpi_gbl_permanent_mmap = 1;
 
         status = acpi_reallocate_root_table();