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powerpc/64s/interrupt: clean up interrupt return labels

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Normal kernel-interrupt exits can get interrupt_return_srr_user_restart
in their backtrace, which is an unusual and notable function, and it is
part of the user-interrupt exit path, which is doubly confusing.

Add non-local labels for both user and kernel interrupt exit cases to
address this and make the user and kernel cases more symmetric. Also get
rid of an unused label.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210630074621.2109197-9-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2021-06-30 17:46:20 +10:00 • committed by Michael Ellerman
parent 98798f33c6
commit c59458b00a
1 changed files with 5 additions and 3 deletions
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8
arch/powerpc/kernel/interrupt_64.S
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@ -509,7 +509,9 @@ interrupt_return_\srr\():
_ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\())
ld r4,_MSR(r1)
andi. r0,r4,MSR_PR
beq .Lkernel_interrupt_return_\srr
beq interrupt_return_\srr\()_kernel
interrupt_return_\srr\()_user: /* make backtraces match the _kernel variant */
_ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\()_user)
addi r3,r1,STACK_FRAME_OVERHEAD
bl interrupt_exit_user_prepare
cmpdi r3,0
@ -623,8 +625,8 @@ RESTART_TABLE(.Linterrupt_return_\srr\()_user_rst_start, .Linterrupt_return_\srr
#endif
.balign IFETCH_ALIGN_BYTES
.Lkernel_interrupt_return_\srr\():
.Linterrupt_return_\srr\()_kernel:
interrupt_return_\srr\()_kernel:
_ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\()_kernel)
addi r3,r1,STACK_FRAME_OVERHEAD
bl interrupt_exit_kernel_prepare