These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / arch / x86 / kernel / paravirt_patch_32.c

diff --git a/kernel/arch/x86/kernel/paravirt_patch_32.c b/kernel/arch/x86/kernel/paravirt_patch_32.c
index d9f32e6..c89f50a 100644 (file)
--- a/kernel/arch/x86/kernel/paravirt_patch_32.c
+++ b/kernel/arch/x86/kernel/paravirt_patch_32.c
@@ -10,7 +10,10 @@ DEF_NATIVE(pv_mmu_ops, read_cr2, "mov %cr2, %eax");
 DEF_NATIVE(pv_mmu_ops, write_cr3, "mov %eax, %cr3");
 DEF_NATIVE(pv_mmu_ops, read_cr3, "mov %cr3, %eax");
 DEF_NATIVE(pv_cpu_ops, clts, "clts");
-DEF_NATIVE(pv_cpu_ops, read_tsc, "rdtsc");
+
+#if defined(CONFIG_PARAVIRT_SPINLOCKS) && defined(CONFIG_QUEUED_SPINLOCKS)
+DEF_NATIVE(pv_lock_ops, queued_spin_unlock, "movb $0, (%eax)");
+#endif
 
 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len)
 {
@@ -24,6 +27,8 @@ unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)
        return 0;
 }
 
+extern bool pv_is_native_spin_unlock(void);
+
 unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
                      unsigned long addr, unsigned len)
 {
@@ -46,15 +51,22 @@ unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
                PATCH_SITE(pv_mmu_ops, read_cr3);
                PATCH_SITE(pv_mmu_ops, write_cr3);
                PATCH_SITE(pv_cpu_ops, clts);
-               PATCH_SITE(pv_cpu_ops, read_tsc);
-
-       patch_site:
-               ret = paravirt_patch_insns(ibuf, len, start, end);
-               break;
+#if defined(CONFIG_PARAVIRT_SPINLOCKS) && defined(CONFIG_QUEUED_SPINLOCKS)
+               case PARAVIRT_PATCH(pv_lock_ops.queued_spin_unlock):
+                       if (pv_is_native_spin_unlock()) {
+                               start = start_pv_lock_ops_queued_spin_unlock;
+                               end   = end_pv_lock_ops_queued_spin_unlock;
+                               goto patch_site;
+                       }
+#endif
 
        default:
                ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
                break;
+
+patch_site:
+               ret = paravirt_patch_insns(ibuf, len, start, end);
+               break;
        }
 #undef PATCH_SITE
        return ret;