Patch "powerpc: Uncomment and make enable_kernel_vsx() routine available" has been added to the 4.1-stable tree

Patch "powerpc: Uncomment and make enable_kernel_vsx() routine available" has been added to the 4.1-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    powerpc: Uncomment and make enable_kernel_vsx() routine available

to the 4.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     powerpc-uncomment-and-make-enable_kernel_vsx-routine-available.patch
and it can be found in the queue-4.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 72cd7b44bc99376b3f3c93cedcd052663fcdf705 Mon Sep 17 00:00:00 2001
From: Leonidas Da Silva Barbosa <leosilva@linux.vnet.ibm.com>
Date: Mon, 13 Jul 2015 13:51:01 -0300
Subject: powerpc: Uncomment and make enable_kernel_vsx() routine available

From: Leonidas Da Silva Barbosa <leosilva@linux.vnet.ibm.com>

commit 72cd7b44bc99376b3f3c93cedcd052663fcdf705 upstream.

enable_kernel_vsx() function was commented since anything was using
it. However, vmx-crypto driver uses VSX instructions which are
only available if VSX is enable. Otherwise it rises an exception oops.

This patch uncomment enable_kernel_vsx() routine and makes it available.

Signed-off-by: Leonidas S. Barbosa <leosilva@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/powerpc/include/asm/switch_to.h |    1 +
 arch/powerpc/kernel/process.c        |    3 ---
 2 files changed, 1 insertion(+), 3 deletions(-)

--- a/arch/powerpc/include/asm/switch_to.h
+++ b/arch/powerpc/include/asm/switch_to.h
@@ -29,6 +29,7 @@ static inline void save_early_sprs(struc
 
 extern void enable_kernel_fp(void);
 extern void enable_kernel_altivec(void);
+extern void enable_kernel_vsx(void);
 extern int emulate_altivec(struct pt_regs *);
 extern void __giveup_vsx(struct task_struct *);
 extern void giveup_vsx(struct task_struct *);
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -204,8 +204,6 @@ EXPORT_SYMBOL_GPL(flush_altivec_to_threa
 #endif /* CONFIG_ALTIVEC */
 
 #ifdef CONFIG_VSX
-#if 0
-/* not currently used, but some crazy RAID module might want to later */
 void enable_kernel_vsx(void)
 {
 	WARN_ON(preemptible());
@@ -220,7 +218,6 @@ void enable_kernel_vsx(void)
 #endif /* CONFIG_SMP */
 }
 EXPORT_SYMBOL(enable_kernel_vsx);
-#endif
 
 void giveup_vsx(struct task_struct *tsk)
 {


Patches currently in stable-queue which might be from leosilva@linux.vnet.ibm.com are

queue-4.1/powerpc-uncomment-and-make-enable_kernel_vsx-routine-available.patch
queue-4.1/crypto-vmx-adding-enable_kernel_vsx-to-access-vsx-instructions.patch