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powerpc/32: Remove unneccessary calculations in load_up_{fpu/altivec}

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No need to re-read SPRN_THREAD, we can calculate thread address
from current (r2).

And remove a reload of value 1 into r4 as r4 is already 1.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c04cce578b97a76a9e69a096698b1d89f721768a.1629276437.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-08-18 08:47:28 +00:00 committed by Michael Ellerman
parent 6af0b5570b
commit 51ed00e71f
2 changed files with 2 additions and 5 deletions
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3
arch/powerpc/kernel/fpu.S
View file

@ -91,8 +91,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_VSX)
isync
/* enable use of FP after return */
#ifdef CONFIG_PPC32
mfspr r5,SPRN_SPRG_THREAD /* current task's THREAD (phys) */
tovirt(r5, r5)
addi r5,r2,THREAD
lwz r4,THREAD_FPEXC_MODE(r5)
ori r9,r9,MSR_FP /* enable FP for current */
or r9,r9,r4

4
arch/powerpc/kernel/vector.S
View file

@ -65,9 +65,8 @@ _GLOBAL(load_up_altivec)
1:
/* enable use of VMX after return */
#ifdef CONFIG_PPC32
mfspr r5,SPRN_SPRG_THREAD /* current task's THREAD (phys) */
addi r5,r2,THREAD
oris r9,r9,MSR_VEC@h
tovirt(r5, r5)
#else
ld r4,PACACURRENT(r13)
addi r5,r4,THREAD /* Get THREAD */
@ -81,7 +80,6 @@ _GLOBAL(load_up_altivec)
li r4,1
stb r4,THREAD_LOAD_VEC(r5)
addi r6,r5,THREAD_VRSTATE
li r4,1
li r10,VRSTATE_VSCR
stw r4,THREAD_USED_VR(r5)
lvx v0,r10,r6