diff options
| author | Sami Tolvanen <samitolvanen@google.com> | 2023-09-28 01:48:00 +0300 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2023-10-28 00:43:06 +0300 |
| commit | 82982fdd5133fa7e0b2dfaf746d18d6f29922b82 (patch) | |
| tree | 40e0c20f8cb63a680cce12ebaf14df94c757d673 /arch/riscv/include/asm/asm.h | |
| parent | be97d0db5f44c0674480cb79ac6f5b0529b84c76 (diff) | |
| download | linux-82982fdd5133fa7e0b2dfaf746d18d6f29922b82.tar.xz | |
riscv: Deduplicate IRQ stack switching
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>
Diffstat (limited to 'arch/riscv/include/asm/asm.h')
| -rw-r--r-- | arch/riscv/include/asm/asm.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/asm.h b/arch/riscv/include/asm/asm.h index bfb4c26f113c..8e446be2d57c 100644 --- a/arch/riscv/include/asm/asm.h +++ b/arch/riscv/include/asm/asm.h @@ -104,6 +104,11 @@ .endm #endif /* CONFIG_SMP */ +.macro load_per_cpu dst ptr tmp + asm_per_cpu \dst \ptr \tmp + REG_L \dst, 0(\dst) +.endm + /* save all GPs except x1 ~ x5 */ .macro save_from_x6_to_x31 REG_S x6, PT_T1(sp) |