x86, UV: remove erroneous BAU initialization

commit 46814dded1b972a07b1609d81632eef3009fbb10 upstream.

Impact: fix crash on x86/UV

UV is the SGI "UltraViolet" machine, which is x86_64 based.
BAU is the "Broadcast Assist Unit", used for TLB shootdown in UV.

This patch removes the allocation and initialization of an unused table.

This table is left over from a development test mode.  It is unused in
the present code.

And it was incorrectly initialized: 8 entries allocated but 17 initialized,
causing slab corruption.

This patch should go into 2.6.27 and 2.6.28 as well as the current tree.

Diffed against 2.6.28 (linux-next, 12/30/08)

Signed-off-by: Cliff Wickman <cpw@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/arch/x86/kernel/tlb_uv.c b/arch/x86/kernel/tlb_uv.c
index 04431f34fd16f24946bb66b4eedf69ed7e51cf6f..ef493a0a21995d29407bbe035af52f9fd7108d5b 100644 (file)
--- a/arch/x86/kernel/tlb_uv.c
+++ b/arch/x86/kernel/tlb_uv.c
@@ -586,7 +586,6 @@ static int __init uv_ptc_init(void)
 static struct bau_control * __init uv_table_bases_init(int blade, int node)
 {
        int i;
-       int *ip;
        struct bau_msg_status *msp;
        struct bau_control *bau_tabp;
 
@@ -603,13 +602,6 @@ static struct bau_control * __init uv_table_bases_init(int blade, int node)
                bau_cpubits_clear(&msp->seen_by, (int)
                                  uv_blade_nr_possible_cpus(blade));
 
-       bau_tabp->watching =
-           kmalloc_node(sizeof(int) * DEST_NUM_RESOURCES, GFP_KERNEL, node);
-       BUG_ON(!bau_tabp->watching);
-
-       for (i = 0, ip = bau_tabp->watching; i < DEST_Q_SIZE; i++, ip++)
-               *ip = 0;
-
        uv_bau_table_bases[blade] = bau_tabp;
 
        return bau_tabp;
@@ -632,7 +624,6 @@ uv_table_bases_finish(int blade, int node, int cur_cpu,
                bcp->bau_msg_head       = bau_tablesp->va_queue_first;
                bcp->va_queue_first     = bau_tablesp->va_queue_first;
                bcp->va_queue_last      = bau_tablesp->va_queue_last;
-               bcp->watching           = bau_tablesp->watching;
                bcp->msg_statuses       = bau_tablesp->msg_statuses;
                bcp->descriptor_base    = adp;
        }