x86, UV: remove erroneous BAU initialization

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>
Cc: <stable@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/tlb_uv.c b/arch/x86/kernel/tlb_uv.c
index 6a00e5faaa74375d5b709488a0b9c371c3fe5c79..f885023167e042073cc3f37721cb7a0d3e1b2941 100644 (file)
--- a/arch/x86/kernel/tlb_uv.c
+++ b/arch/x86/kernel/tlb_uv.c
@@ -582,7 +582,6 @@ 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;
 
@@ -599,13 +598,6 @@ 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;
@@ -628,7 +620,6 @@ 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;
        }