riscv: Deduplicate IRQ stack switching

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With CONFIG_IRQ_STACKS, we switch to a separate per-CPU IRQ stack
before calling handle_riscv_irq or __do_softirq. We currently
have duplicate inline assembly snippets for stack switching in
both code paths. Now that we can access per-CPU variables in
assembly, implement call_on_irq_stack in assembly, and use that
instead of redundant inline assembly.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Guo Ren <guoren@kernel.org>
Link: https://lore.kernel.org/r/20230927224757.1154247-10-samitolvanen@google.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

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Sami Tolvanen 2023-09-27 22:48:00 +00:00 • committed by Palmer Dabbelt

parent be97d0db5f

commit 82982fdd51

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6 changed files with 55 additions and 55 deletions

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5

arch/riscv/include/asm/asm.h

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arch/riscv/include/asm/irq_stack.h

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arch/riscv/kernel/asm-offsets.c

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arch/riscv/kernel/entry.S

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arch/riscv/kernel/irq.c

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arch/riscv/kernel/traps.c

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