From mboxrd@z Thu Jan 1 00:00:00 1970 From: mkl@pengutronix.de (Marc Kleine-Budde) Date: Tue, 23 Jul 2013 16:08:43 +0200 Subject: [PATCH v2] arm: Fix deferred mm switch on VIVT processors In-Reply-To: <1374252329-5345-1-git-send-email-catalin.marinas@arm.com> References: <1374252329-5345-1-git-send-email-catalin.marinas@arm.com> Message-ID: <51EE8E6B.7070801@pengutronix.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 07/19/2013 06:45 PM, Catalin Marinas wrote: > As of commit b9d4d42ad9 (ARM: Remove __ARCH_WANT_INTERRUPTS_ON_CTXSW on > pre-ARMv6 CPUs), the mm switching on VIVT processors is done in the > finish_arch_post_lock_switch() function to avoid whole cache flushing > with interrupts disabled. The need for deferred mm switch is stored as a > thread flag (TIF_SWITCH_MM). However, with preemption enabled, we can > have another thread switch before finish_arch_post_lock_switch(). If the > new thread has the same mm as the previous 'next' thread, the scheduler > will not call switch_mm() and the TIF_SWITCH_MM flag won't be set for > the new thread. > > This patch moves the switch pending flag to the mm_context_t structure > since this is specific to the mm rather than thread. > > Signed-off-by: Catalin Marinas > Reported-by: Marc Kleine-Budde > Cc: Marc Kleine-Budde > Cc: # 3.5+ Tested-by: Marc Kleine-Budde regards, Marc -- Pengutronix e.K. | Marc Kleine-Budde | Industrial Linux Solutions | Phone: +49-231-2826-924 | Vertretung West/Dortmund | Fax: +49-5121-206917-5555 | Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de | -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 259 bytes Desc: OpenPGP digital signature URL: