[IA64] Fix 2.6 kernel for the new ia64 assembler

The new ia64 assembler uses slot 1 for the offset of a long (2-slot)
instruction and the old assembler uses slot 2. The 2.6 kernel assumes
slot 2 and won't boot when the new assembler is used:

http://sources.redhat.com/bugzilla/show_bug.cgi?id=1433

This patch will work with either slot 1 or 2.

Patch provided by H.J. Lu

Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 12 insertions, 4 deletions

diff --git a/arch/ia64/kernel/patch.c b/arch/ia64/kernel/patch.c
index 367804a605fa..6a4ac7d70b35 100644
--- a/arch/ia64/kernel/patch.c
+++ b/arch/ia64/kernel/patch.c
@@ -64,22 +64,30 @@ ia64_patch (u64 insn_addr, u64 mask, u64 val)
 void
 ia64_patch_imm64 (u64 insn_addr, u64 val)
 {
-        ia64_patch(insn_addr,
+        /* The assembler may generate offset pointing to either slot 1
+           or slot 2 for a long (2-slot) instruction, occupying slots 1
+           and 2.  */
+        insn_addr &= -16UL;
+        ia64_patch(insn_addr + 2,
                    0x01fffefe000UL, (  ((val & 0x8000000000000000UL) >> 27) /* bit 63 -> 36 */
                                      | ((val & 0x0000000000200000UL) <<  0) /* bit 21 -> 21 */
                                      | ((val & 0x00000000001f0000UL) <<  6) /* bit 16 -> 22 */
                                      | ((val & 0x000000000000ff80UL) << 20) /* bit  7 -> 27 */
                                      | ((val & 0x000000000000007fUL) << 13) /* bit  0 -> 13 */));
-        ia64_patch(insn_addr - 1, 0x1ffffffffffUL, val >> 22);
+        ia64_patch(insn_addr + 1, 0x1ffffffffffUL, val >> 22);
 }
 
 void
 ia64_patch_imm60 (u64 insn_addr, u64 val)
 {
-        ia64_patch(insn_addr,
+        /* The assembler may generate offset pointing to either slot 1
+           or slot 2 for a long (2-slot) instruction, occupying slots 1
+           and 2.  */
+        insn_addr &= -16UL;
+        ia64_patch(insn_addr + 2,
                    0x011ffffe000UL, (  ((val & 0x0800000000000000UL) >> 23) /* bit 59 -> 36 */
                                      | ((val & 0x00000000000fffffUL) << 13) /* bit  0 -> 13 */));
-        ia64_patch(insn_addr - 1, 0x1fffffffffcUL, val >> 18);
+        ia64_patch(insn_addr + 1, 0x1fffffffffcUL, val >> 18);
 }
 
 /*