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From: Madhavan Srinivasan <maddy@linux.ibm.com>
To: Michael Ellerman <mpe@ellerman.id.au>,
	Nicholas Piggin <npiggin@gmail.com>,
	Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v2] powerpc/32: Restore clearing of MSR[RI] at interrupt/syscall exit
Date: Fri, 21 Nov 2025 08:23:45 +0530	[thread overview]
Message-ID: <176369324782.72695.4834349626234011724.b4-ty@linux.ibm.com> (raw)
In-Reply-To: <66d0ab070563ad460ed481328ab0887c27f21a2c.1757593807.git.christophe.leroy@csgroup.eu>

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

  reply	other threads:[~2025-11-21  3:43 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-09-11 12:30 Christophe Leroy
2025-11-21  2:53 ` Madhavan Srinivasan [this message]
2025-12-17 16:03 ` Guenter Roeck
2025-12-17 17:39   ` Christophe Leroy (CS GROUP)

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