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Re: [PATCH v2 02/39] xen/riscv: drop bug.h's duplicate instruction length helpers
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 1 Sep 2026 09:01:45 +0200
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- Cc: Romain Caritey <Romain.Caritey@xxxxxxxxxxxxx>, Baptiste Le Duc <baptiste.le-duc@xxxxxxxxxx>, Zheng Zhang <zhangzheng@xxxxxxxxxxx>, Alistair Francis <alistair.francis@xxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 01 Sep 2026 07:02:07 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 27.08.2026 17:20, Oleksii Kurochko wrote:
> asm/riscv_encoding.h already provides INSN_16BIT_MASK and INSN_LEN(), and
> emulate.c uses them, so the tree carried two spellings of the same thing
> which could drift apart. COMPRESSED_INSN_MASK never had a user.
>
> No functional change.
>
> Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
As I'm happy to see the duplication go away:
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
However, ...
> --- a/xen/arch/riscv/traps.c
> +++ b/xen/arch/riscv/traps.c
> @@ -214,7 +214,7 @@ void do_trap(struct cpu_user_regs *cpu_regs)
> die();
> }
>
> - cpu_regs->sepc += GET_INSN_LENGTH(*(uint16_t *)pc);
> + cpu_regs->sepc += INSN_LEN(*(uint16_t *)pc);
... for one I'd prefer if we took the opportunity and add "const" to the
pointer target here.
And then
#define INSN_16BIT_MASK 0x3
#define INSN_32BIT_MASK 0x1c
are really named backwards, seeing e.g. their use in
#define INSN_IS_16BIT(insn) \
(((insn) & INSN_16BIT_MASK) != INSN_16BIT_MASK)
#define INSN_IS_32BIT(insn) \
(((insn) & INSN_16BIT_MASK) == INSN_16BIT_MASK && \
((insn) & INSN_32BIT_MASK) != INSN_32BIT_MASK)
Furthermore,
#define INSN_LEN(insn) (INSN_IS_16BIT(insn) ? 2 : 4)
fails to use INSN_32BIT_MASK / INSN_IS_32BIT() altogether.
Jan
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