From: Madhavan Srinivasan <maddy@linux.ibm.com>
To: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
Saket Kumar Bhaskar <skb99@linux.ibm.com>
Cc: mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org,
segher@kernel.crashing.org, hbathini@linux.ibm.com,
venkat88@linux.ibm.com, yeswanth@linux.ibm.com
Subject: Re: [PATCH v3] powerpc/irq: Fix missing r2 clobber in PCREL inline assembly
Date: Thu, 6 Aug 2026 09:46:35 +0530 [thread overview]
Message-ID: <178598971878.942627.14667171310466300671.b4-ty@linux.ibm.com> (raw)
In-Reply-To: <10fc2cda485cd22e209a31d786bed1984bdf3982.1785732393.git.skb99@linux.ibm.com>
On Mon, 03 Aug 2026 10:58:43 +0530, Saket Kumar Bhaskar wrote:
> In CONFIG_PPC_KERNEL_PCREL mode, r2 is no longer reserved for the TOC
> pointer and is available as a caller-saved register [0].
>
> Both call_do_irq() and call_do_softirq() use inline assembly to call
> functions with stack switching, but fail to list r2 in their clobber
> lists. This causes the compiler to assume r2 is preserved across these
> calls, leading to register corruption when the called functions
> (__do_irq and __do_softirq) clobber r2.
>
> [...]
Applied to powerpc/next.
[1/1] powerpc/irq: Fix missing r2 clobber in PCREL inline assembly
https://git.kernel.org/powerpc/c/00be69070d91d2be978e752bb117a0a4db0e1281
cheers
prev parent reply other threads:[~2026-08-06 4:17 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-03 5:28 [PATCH v3] powerpc/irq: Fix missing r2 clobber in PCREL inline assembly Saket Kumar Bhaskar
2026-08-03 6:03 ` Hari Bathini
2026-08-06 4:16 ` Madhavan Srinivasan [this message]
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