xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

powerpc: Move part of giveup_vsx into c

Browse Source 
Move the MSR modification into c. Removing it from the assembly
function will allow us to avoid costly MSR writes by batching them
up.

Check the FP and VMX bits before calling the relevant giveup_*()
function. This makes giveup_vsx() and flush_vsx_to_thread() perform
more like their sister functions, and allows us to use
flush_vsx_to_thread() in the signal code.

Move the check_if_tm_restore_required() check in.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Anton Blanchard
2015-10-29 11:44:02 +11:00
committed by Michael Ellerman
parent 98da581e08
commit a7d623d4d0
4 changed files with 23 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
arch/powerpc/kernel/signal_64.c
View File

@@ -147,7 +147,7 @@ static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
* VMX data.
*/
if (current->thread.used_vsr && ctx_has_vsx_region) {
__giveup_vsx(current);
flush_vsx_to_thread(current);
v_regs += ELF_NVRREG;
err |= copy_vsx_to_user(v_regs, current);
/* set MSR_VSX in the MSR value in the frame to
@@ -270,7 +270,7 @@ static long setup_tm_sigcontexts(struct sigcontext __user *sc,
* VMX data.
*/
if (current->thread.used_vsr) {
__giveup_vsx(current);
flush_vsx_to_thread(current);
v_regs += ELF_NVRREG;
tm_v_regs += ELF_NVRREG;