From: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
To: Imre Kaloz <kaloz@kernel.org>
Cc: linux-mips@vger.kernel.org, Paul Burton <paulburton@kernel.org>,
linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH] MIPS: mm: Fix the cache error vector jump for XKPHYS kernels
Date: Thu, 5 Nov 2026 16:25:29 +0100 [thread overview]
Message-ID: <auyf6aVT0_KuAm2r@alpha.franken.de> (raw)
In-Reply-To: <20261021185709.22561-1-kaloz@kernel.org>
On Wed, Oct 21, 2026 at 08:57:09PM +0200, Imre Kaloz wrote:
> except_vec2_generic jumps to cache_parity_error with a j, which cannot
> leave the vector's 256MB region. An XKPHYS kernel such as IP30's, linked
> at 512MB, is outside it, so the j targets an unbacked address and its
> speculative fetch raises bus errors on unrelated fetches. Jump to the
> handler's uncached XKPHYS address instead.
>
> Fixes: 7505576d1c1a ("MIPS: add support for SGI Octane (IP30)")
> Cc: stable@vger.kernel.org
> Signed-off-by: Imre Kaloz <kaloz@kernel.org>
> ---
> arch/mips/mm/cex-gen.S | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
applied to mips-fixes
Thomas.
--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]
prev parent reply other threads:[~2026-11-05 15:45 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-21 18:57 [PATCH] MIPS: mm: Fix the cache error vector jump for XKPHYS kernels Imre Kaloz
2026-11-05 15:25 ` Thomas Bogendoerfer [this message]
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