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authorJulien Thierry <julien.thierry@arm.com>2018-09-11 10:12:18 +0100
committerRussell King <rmk+kernel@armlinux.org.uk>2018-10-05 10:51:15 +0100
commit3aa2df6ec2ca6bc143a65351cca4266d03a8bc41 (patch)
tree5e8f2c4550c0097ba86d75c5b35b411731de8bcb /arch/arm/vfp
parent73839798af7ebc6c8d0c9271ebbbc148700e521f (diff)
downloadblackbird-op-linux-3aa2df6ec2ca6bc143a65351cca4266d03a8bc41.tar.gz
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ARM: 8791/1: vfp: use __copy_to_user() when saving VFP state
Use __copy_to_user() rather than __put_user_error() for individual members when saving VFP state. This has the benefit of disabling/enabling PAN once per copied struct intead of once per write. Signed-off-by: Julien Thierry <julien.thierry@arm.com> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm/vfp')
-rw-r--r--arch/arm/vfp/vfpmodule.c20
1 files changed, 8 insertions, 12 deletions
diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c
index 859d50ea17d3..3b75f1d8a491 100644
--- a/arch/arm/vfp/vfpmodule.c
+++ b/arch/arm/vfp/vfpmodule.c
@@ -554,12 +554,11 @@ void vfp_flush_hwstate(struct thread_info *thread)
* Save the current VFP state into the provided structures and prepare
* for entry into a new function (signal handler).
*/
-int vfp_preserve_user_clear_hwstate(struct user_vfp __user *ufp,
- struct user_vfp_exc __user *ufp_exc)
+int vfp_preserve_user_clear_hwstate(struct user_vfp *ufp,
+ struct user_vfp_exc *ufp_exc)
{
struct thread_info *thread = current_thread_info();
struct vfp_hard_struct *hwstate = &thread->vfpstate.hard;
- int err = 0;
/* Ensure that the saved hwstate is up-to-date. */
vfp_sync_hwstate(thread);
@@ -568,22 +567,19 @@ int vfp_preserve_user_clear_hwstate(struct user_vfp __user *ufp,
* Copy the floating point registers. There can be unused
* registers see asm/hwcap.h for details.
*/
- err |= __copy_to_user(&ufp->fpregs, &hwstate->fpregs,
- sizeof(hwstate->fpregs));
+ memcpy(&ufp->fpregs, &hwstate->fpregs, sizeof(hwstate->fpregs));
+
/*
* Copy the status and control register.
*/
- __put_user_error(hwstate->fpscr, &ufp->fpscr, err);
+ ufp->fpscr = hwstate->fpscr;
/*
* Copy the exception registers.
*/
- __put_user_error(hwstate->fpexc, &ufp_exc->fpexc, err);
- __put_user_error(hwstate->fpinst, &ufp_exc->fpinst, err);
- __put_user_error(hwstate->fpinst2, &ufp_exc->fpinst2, err);
-
- if (err)
- return -EFAULT;
+ ufp_exc->fpexc = hwstate->fpexc;
+ ufp_exc->fpinst = hwstate->fpinst;
+ ufp_exc->fpinst2 = ufp_exc->fpinst2;
/* Ensure that VFP is disabled. */
vfp_flush_hwstate(thread);
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