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powerpc/ftrace: Simplify PPC32's return_to_handler() 

return_to_handler() was copied from PPC64. For PPC32 it
just needs to save r3 and r4, and doesn't require any nop
after the bl.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/aab39b77b34fb2c4ed08ed01c547b6ed13643788.1640017960.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-12-20 16:38:19 +00:00 committed by Michael Ellerman
parent 7875bc9b07
commit 7bdb478c1d
1 changed files with 6 additions and 10 deletions
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16
arch/powerpc/kernel/trace/ftrace_32.S
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@ -162,22 +162,18 @@ _GLOBAL(ftrace_graph_caller)
_GLOBAL(return_to_handler)
/* need to save return values */
stwu r1, -32(r1)
stw r3, 20(r1)
stw r4, 16(r1)
stw r31, 12(r1)
mr r31, r1
stwu r1, -16(r1)
stw r3, 8(r1)
stw r4, 12(r1)
bl ftrace_return_to_handler
nop
/* return value has real return address */
mtlr r3
lwz r3, 20(r1)
lwz r4, 16(r1)
lwz r31,12(r1)
lwz r1, 0(r1)
lwz r3, 8(r1)
lwz r4, 12(r1)
addi r1, r1, 16
/* Jump back to real return address */
blr