From: Mark Rutland <mark.rutland@arm.com>
To: "Mukesh Kumar Chaurasiya (IBM)" <mkchauras@gmail.com>
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rust-for-linux@vger.kernel.org, llvm@lists.linux.dev
Subject: Re: [RFC] rust: kernel: Add KUnit tests for ARCH_WARN_ASM bug table emission
Date: Thu, 24 Sep 2026 13:31:42 +0100 [thread overview]
Message-ID: <arUYLsJJewE--wqo@J2N7QTR9R3> (raw)
In-Reply-To: <20260922054959.955093-2-mkchauras@gmail.com>
On Tue, Sep 22, 2026 at 11:20:00AM +0530, Mukesh Kumar Chaurasiya (IBM) wrote:
> Verify that the __bug_table entry emitted by ARCH_WARN_ASM has a correct
> bug_addr displacement — i.e. the arch's trap label reference resolves to
> the trap instruction — by calling find_bug() with the exact virtual address
> of the trap, mirroring what the real trap handler does.
>
> To support all architectures, each arch that implements ARCH_WARN_ASM now
> defines ARCH_WARN_ASM_TRAP_LABEL, a string constant naming the local label
> at which the trap instruction is placed:
>
> x86 "1" (ud2 at label 1:)
> powerpc "1" (twi at label 1:)
> riscv "1" (ebreak at label 1:)
> arm64 "14471" (brk placed at 14471: by __BUG_ENTRY_END)
> s390 "0" (mc at label 0:)
I'm not a fan of exposing such a low-level implementation detail out of
the architecture code, and I don't think we should expose this.
What exactly are you trying to verify here, and why? Has there been
some _specific_ issue on powerpc that caused you to look at this?
Mark.
next prev parent reply other threads:[~2026-09-24 12:31 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-22 5:50 Mukesh Kumar Chaurasiya (IBM)
2026-09-22 6:47 ` Peter Zijlstra
2026-09-23 6:28 ` Mukesh Kumar Chaurasiya
2026-09-24 11:15 ` Peter Zijlstra
2026-09-24 12:46 ` Mark Rutland
2026-09-24 12:52 ` Peter Zijlstra
2026-09-24 13:05 ` Mark Rutland
2026-09-24 15:13 ` Heiko Carstens
2026-09-24 12:31 ` Mark Rutland [this message]
2026-09-24 13:00 ` Christophe Leroy (CS GROUP)
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