linux-kernel - Re: [PATCH v2] powerpc/32: Restore clearing of MSR[RI] at interrupt/syscall exit

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Message-ID: <176369324782.72695.4834349626234011724.b4-ty@linux.ibm.com>
Date: Fri, 21 Nov 2025 08:23:45 +0530
From: Madhavan Srinivasan <maddy@...ux.ibm.com>
To: Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>
Cc: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2] powerpc/32: Restore clearing of MSR[RI] at interrupt/syscall exit

On Thu, 11 Sep 2025 14:30:12 +0200, Christophe Leroy wrote:
> Commit 13799748b957 ("powerpc/64: use interrupt restart table to speed
> up return from interrupt") removed the inconditional clearing of
> MSR[RI] when returning from interrupt into kernel. But powerpc/32
> doesn't implement interrupt restart table hence still need MSR[RI]
> to be cleared.
> 
> It could be added back in interrupt_exit_kernel_prepare() but it is
> easier and better to add it back in entry_32.S for following reasons:
> - Writing to MSR must be followed by a synchronising instruction
> - The smaller the non recoverable section is the better it is
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/32: Restore clearing of MSR[RI] at interrupt/syscall exit
      https://git.kernel.org/powerpc/c/2997876c4a1a5864baa13d7393c2b68cf5b51183

Thanks