[PATCH 3.19 084/175] MIPS: Export MSA functions used by lose_fpu(1) for KVM

From: Greg Kroah-Hartman
Date: Wed Mar 04 2015 - 01:50:23 EST

3.19-stable review patch. If anyone has any objections, please let me know.


From: James Hogan <james.hogan@xxxxxxxxxx>

commit ca5d25642e212f73492d332d95dc90ef46a0e8dc upstream.

Export the _save_msa asm function used by the lose_fpu(1) macro to GPL
modules so that KVM can make use of it when it is built as a module.

This fixes the following build error when CONFIG_KVM=m and
CONFIG_CPU_HAS_MSA=y due to commit f798217dfd03 ("KVM: MIPS: Don't leak
FPU/DSP to guest"):

ERROR: "_save_msa" [arch/mips/kvm/kvm.ko] undefined!

Fixes: f798217dfd03 (KVM: MIPS: Don't leak FPU/DSP to guest)
Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Paul Burton <paul.burton@xxxxxxxxxx>
Cc: Gleb Natapov <gleb@xxxxxxxxxx>
Cc: kvm@xxxxxxxxxxxxxxx
Cc: linux-mips@xxxxxxxxxxxxxx
Patchwork: https://patchwork.linux-mips.org/patch/9261/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

arch/mips/kernel/mips_ksyms.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/arch/mips/kernel/mips_ksyms.c
+++ b/arch/mips/kernel/mips_ksyms.c
@@ -15,6 +15,7 @@
#include <asm/uaccess.h>
#include <asm/ftrace.h>
#include <asm/fpu.h>
+#include <asm/msa.h>

extern void *__bzero(void *__s, size_t __count);
extern long __strncpy_from_kernel_nocheck_asm(char *__to,
@@ -36,6 +37,9 @@ extern long __strnlen_user_asm(const cha
* Core architecture code

* String functions

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/