Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq

[pandora-kernel.git] / arch / x86 / kernel / alternative.c

diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index a81f2d5..c638228 100644 (file)
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -14,7 +14,6 @@
 #include <asm/pgtable.h>
 #include <asm/mce.h>
 #include <asm/nmi.h>
-#include <asm/vsyscall.h>
 #include <asm/cacheflush.h>
 #include <asm/tlbflush.h>
 #include <asm/io.h>
@@ -250,7 +249,6 @@ static void __init_or_module add_nops(void *insns, unsigned int len)
 
 extern struct alt_instr __alt_instructions[], __alt_instructions_end[];
 extern s32 __smp_locks[], __smp_locks_end[];
-extern char __vsyscall_0;
 void *text_poke_early(void *addr, const void *opcode, size_t len);
 
 /* Replace instructions with better alternatives for this CPU type.
@@ -263,6 +261,7 @@ void __init_or_module apply_alternatives(struct alt_instr *start,
                                         struct alt_instr *end)
 {
        struct alt_instr *a;
+       u8 *instr, *replacement;
        u8 insnbuf[MAX_PATCH_LEN];
 
        DPRINTK("%s: alt table %p -> %p\n", __func__, start, end);
@@ -276,25 +275,23 @@ void __init_or_module apply_alternatives(struct alt_instr *start,
         * order.
         */
        for (a = start; a < end; a++) {
-               u8 *instr = a->instr;
+               instr = (u8 *)&a->instr_offset + a->instr_offset;
+               replacement = (u8 *)&a->repl_offset + a->repl_offset;
                BUG_ON(a->replacementlen > a->instrlen);
                BUG_ON(a->instrlen > sizeof(insnbuf));
                BUG_ON(a->cpuid >= NCAPINTS*32);
                if (!boot_cpu_has(a->cpuid))
                        continue;
-#ifdef CONFIG_X86_64
-               /* vsyscall code is not mapped yet. resolve it manually. */
-               if (instr >= (u8 *)VSYSCALL_START && instr < (u8*)VSYSCALL_END) {
-                       instr = __va(instr - (u8*)VSYSCALL_START + (u8*)__pa_symbol(&__vsyscall_0));
-                       DPRINTK("%s: vsyscall fixup: %p => %p\n",
-                               __func__, a->instr, instr);
-               }
-#endif
-               memcpy(insnbuf, a->replacement, a->replacementlen);
+
+               memcpy(insnbuf, replacement, a->replacementlen);
+
+               /* 0xe8 is a relative jump; fix the offset. */
                if (*insnbuf == 0xe8 && a->replacementlen == 5)
-                   *(s32 *)(insnbuf + 1) += a->replacement - a->instr;
+                   *(s32 *)(insnbuf + 1) += replacement - instr;
+
                add_nops(insnbuf + a->replacementlen,
                         a->instrlen - a->replacementlen);
+
                text_poke_early(instr, insnbuf, a->instrlen);
        }
 }