x86: change assembly definition of paravirt_patch_site

To account for differences in x86_64, we change the macros that
create raw instances of the paravirt_patch_site struct.
We need to align 64-pointers to 64-bit boundaries, so we add an alignment
directive. Also, we need to make room for a word-sized pointer,
instead of a fixed 32-bit one

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/include/asm-x86/paravirt.h b/include/asm-x86/paravirt.h
index 8f79843..5638995 100644 (file)
--- a/include/asm-x86/paravirt.h
+++ b/include/asm-x86/paravirt.h
@@ -5,6 +5,7 @@
 
 #ifdef CONFIG_PARAVIRT
 #include <asm/page.h>
+#include <asm/asm.h>
 
 /* Bitmask of what can be clobbered: usually at least eax. */
 #define CLBR_NONE 0x0
@@ -281,7 +282,8 @@ extern struct pv_mmu_ops pv_mmu_ops;
 #define _paravirt_alt(insn_string, type, clobber)      \
        "771:\n\t" insn_string "\n" "772:\n"            \
        ".pushsection .parainstructions,\"a\"\n"        \
-       "  .long 771b\n"                                \
+       _ASM_ALIGN "\n"                                 \
+       _ASM_PTR " 771b\n"                              \
        "  .byte " type "\n"                            \
        "  .byte 772b-771b\n"                           \
        "  .short " clobber "\n"                        \
@@ -1159,17 +1161,25 @@ static inline unsigned long __raw_local_irq_save(void)
 
 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 4)
 
-#define PARA_SITE(ptype, clobbers, ops)                \
+#define _PVSITE(ptype, clobbers, ops, word, algn)      \
 771:;                                          \
        ops;                                    \
 772:;                                          \
        .pushsection .parainstructions,"a";     \
-        .long 771b;                            \
+        .align algn;                           \
+        word 771b;                             \
         .byte ptype;                           \
         .byte 772b-771b;                       \
         .short clobbers;                       \
        .popsection
 
+
+#ifdef CONFIG_X86_64
+#define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8)
+#else
+#define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4)
+#endif
+
 #define INTERRUPT_RETURN                                               \
        PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE,       \
                  jmp *%cs:pv_cpu_ops+PV_CPU_iret)