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| author |   Julien Thierry <julien.thierry@arm.com> | 2018-09-11 10:12:18 +0100 |
|---|---|---|
| committer |   Russell King <rmk+kernel@armlinux.org.uk> | 2018-10-05 10:51:15 +0100 |
| commit | 3aa2df6ec2ca6bc143a65351cca4266d03a8bc41 (patch) | |
| tree | 5e8f2c4550c0097ba86d75c5b35b411731de8bcb /arch/arm/kernel/signal.c | |
| parent | ARM: 8790/1: signal: always use __copy_to_user to save iwmmxt context (diff) | |
| download | linux-dev-3aa2df6ec2ca6bc143a65351cca4266d03a8bc41.tar.xz linux-dev-3aa2df6ec2ca6bc143a65351cca4266d03a8bc41.zip | |
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 '')
| -rw-r--r-- | arch/arm/kernel/signal.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c index 240a30e167fd..a5c5235ed39c 100644 --- a/arch/arm/kernel/signal.c +++ b/arch/arm/kernel/signal.c @@ -137,17 +137,18 @@ static int restore_iwmmxt_context(char __user **auxp) static int preserve_vfp_context(struct vfp_sigframe __user *frame) { - const unsigned long magic = VFP_MAGIC; - const unsigned long size = VFP_STORAGE_SIZE; + struct vfp_sigframe kframe; int err = 0; - __put_user_error(magic, &frame->magic, err); - __put_user_error(size, &frame->size, err); + memset(&kframe, 0, sizeof(kframe)); + kframe.magic = VFP_MAGIC; + kframe.size = VFP_STORAGE_SIZE; + err = vfp_preserve_user_clear_hwstate(&kframe.ufp, &kframe.ufp_exc); if (err) - return -EFAULT; + return err; - return vfp_preserve_user_clear_hwstate(&frame->ufp, &frame->ufp_exc); + return __copy_to_user(frame, &kframe, sizeof(kframe)); } static int restore_vfp_context(char __user **auxp) |