[PATCH] powerpc: fix compiling CONFIG_PPC_TRANSACTIONAL_MEM when CONFIG_ALTIVEC=n

[Michael Neuling]

We can't compile a kernel with CONFIG_ALTIVEC=n when
CONFIG_PPC_TRANSACTIONAL_MEM=y.  We currently get:

arch/powerpc/kernel/tm.S:320: Error: unsupported relocation against THREAD_VSCR
arch/powerpc/kernel/tm.S:323: Error: unsupported relocation against THREAD_VR0
arch/powerpc/kernel/tm.S:323: Error: unsupported relocation against THREAD_VR0
etc.

The below fixes this with a sprinkling of #ifdefs.

This was found by mpe with kisskb:
  http://kisskb.ellerman.id.au/kisskb/buildresult/8539442/

Signed-off-by: Michael Neuling <mi...@neuling.org>
---
sfr: this would be nice to get in 3.9.

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 59dd545..16e77a8 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -555,10 +555,12 @@ static inline void tm_recheckpoint_new_task(struct 
task_struct *new)
                new->thread.regs->msr |=
                        (MSR_FP | new->thread.fpexc_mode);
        }
+#ifdef CONFIG_ALTIVEC
        if (msr & MSR_VEC) {
                do_load_up_transact_altivec(&new->thread);
                new->thread.regs->msr |= MSR_VEC;
        }
+#endif
        /* We may as well turn on VSX too since all the state is restored now */
        if (msr & MSR_VSX)
                new->thread.regs->msr |= MSR_VSX;
diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index 3acb28e..95068bf 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -866,10 +866,12 @@ static long restore_tm_user_regs(struct pt_regs *regs,
                do_load_up_transact_fpu(&current->thread);
                regs->msr |= (MSR_FP | current->thread.fpexc_mode);
        }
+#ifdef CONFIG_ALTIVEC
        if (msr & MSR_VEC) {
                do_load_up_transact_altivec(&current->thread);
                regs->msr |= MSR_VEC;
        }
+#endif
 
        return 0;
 }
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index 995f854..c179428 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -522,10 +522,12 @@ static long restore_tm_sigcontexts(struct pt_regs *regs,
                do_load_up_transact_fpu(&current->thread);
                regs->msr |= (MSR_FP | current->thread.fpexc_mode);
        }
+#ifdef CONFIG_ALTIVEC
        if (msr & MSR_VEC) {
                do_load_up_transact_altivec(&current->thread);
                regs->msr |= MSR_VEC;
        }
+#endif
 
        return err;
 }
diff --git a/arch/powerpc/kernel/tm.S b/arch/powerpc/kernel/tm.S
index 84dbace..2da67e7 100644
--- a/arch/powerpc/kernel/tm.S
+++ b/arch/powerpc/kernel/tm.S
@@ -309,6 +309,7 @@ _GLOBAL(tm_recheckpoint)
        or      r5, r6, r5                      /* Set MSR.FP+.VSX/.VEC */
        mtmsr   r5
 
+#ifdef CONFIG_ALTIVEC
        /* FP and VEC registers:  These are recheckpointed from thread.fpr[]
         * and thread.vr[] respectively.  The thread.transact_fpr[] version
         * is more modern, and will be loaded subsequently by any FPUnavailable
@@ -323,6 +324,7 @@ _GLOBAL(tm_recheckpoint)
        REST_32VRS(0, r5, r3)                   /* r5 scratch, r3 THREAD ptr */
        ld      r5, THREAD_VRSAVE(r3)
        mtspr   SPRN_VRSAVE, r5
+#endif
 
 dont_restore_vec:
        andi.   r0, r4, MSR_FP
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