RISC-V: KVM: Replace imsic switch-case macros with range checks

The imsic_eix_read/swap/write/set accessors use a family of macros
that expand into a switch with 128 cases covering the EIP and EIE
register windows. This mirrors the csr_read_num() idiom required where
a CSR number must be encoded as a csrr instruction immediate (e.g.
drivers/perf/riscv_pmu.c), but here the register number is merely
written to vsiselect as data, so the expansion solves no real
constraint. It costs ~90 lines of nested macros and trips ~30
checkpatch errors and warnings.

Since the generated cases form two contiguous windows, [IMSIC_EIP0,
IMSIC_EIP63] and [IMSIC_EIE0, IMSIC_EIE63], the same behavior is
expressed with a simple range check. Introduce imsic_eix_ireg_is_valid()
and use it in the four accessors, removing the macros along with the
~30 checkpatch errors and warnings they caused.

No functional change intended. Compile tested with riscv64-linux-gnu-gcc
and tested on QEMU (RISC-V virt, AIA).

Signed-off-by: Xiaofeng Yuan <yuanxiaofeng@eswincomputing.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260917121411.2445-1-yuanxiaofeng@eswincomputing.com
Signed-off-by: Anup Patel <anup@brainfault.org>

0 files changed, 0 insertions, 0 deletions