o...@users.sourceforge.jp>, Linux-sh list <linux...@vger.kernel.org>, Fabio
Estevam <feste...@gmail.com>, Helge Deller <del...@gmx.de>, Daniel Lezcano
<daniel.lezc...@linaro.org>, Jonathan Hunter <jonath...@nvidia.com>, Mathieu
Desnoyers <mathieu.desnoy...@efficios.com>, Frederic Weisbecker
<frede...@kernel.org>, Len Brown <l...@kernel.org>, "open list:TENSILICA XTENSA
PORT \(xtensa\)" <linux-xte...@linux-xtensa.org>, Sascha Hauer
<ker...@pengutronix.de>, Vasily Gorbik <g...@linux.ibm.com>, linux-arm-msm
<linux-arm-...@vger.kernel.org>, alpha <linux-al...@vger.kernel.org>,
linux-m68k <linux-m...@lists.linux-m68k.org>, Stafford Horne
<sho...@gmail.com>, Linux ARM <linux-arm-ker...@lists.infradead.org>, Chris
Zankel <ch...@zankel.net>, Stephen Boyd <sb...@kernel.org>, Dinh Nguyen
<dingu...@kernel.org>, Daniel Bristot de Oliveira <bris...@redhat.com>,
Alexander Shishkin <alexander.shish...@linux.intel.com>, lpieral...@kernel.org,
Rasmus Villemoes <li...@rasmusvillemoes.dk>, Joel Fernandes <
j...@joelfernandes.org>, Will Deacon <w...@kernel.org>, Boris Ostrovsky
<boris.ostrov...@oracle.com>, Kevin Hilman <khil...@kernel.org>,
linux-c...@vger.kernel.org, Pv-drivers <pv-driv...@vmware.com>, "open
list:SYNOPSYS ARC ARCHITECTURE" <linux-snps-...@lists.infradead.org>, Mel
Gorman <mgor...@suse.de>, jacob.jun....@linux.intel.com, Arnd Bergmann
<a...@arndb.de>, Hans Ulli Kroll <ulli.kr...@googlemail.com>, Vineet Gupta
<vgu...@kernel.org>, linux-clk <linux-...@vger.kernel.org>, Josh Triplett
<j...@joshtriplett.org>, Steven Rostedt <rost...@goodmis.org>,
r...@vger.kernel.org, Borislav Petkov <b...@alien8.de>, bc...@quicinc.com,
Thomas Bogendoerfer <tsbog...@alpha.franken.de>, Parisc List
<linux-par...@vger.kernel.org>, Sudeep Holla <sudeep.ho...@arm.com>, Shawn Guo
<shawn...@kernel.org>, David Miller <da...@davemloft.net>, Rich Felker
<dal...@libc.org>, Tony Lindgren <t...@atomide.com>, amakha...@vmware.com,
Bjorn Andersson <bjorn.anders...@linaro.org>, "H. Peter Anvin" <hpa@zytor.c
om>, sparclinux <sparcli...@vger.kernel.org>, "open l
ist:QUALCOMM HEXAGON..." <linux-hexa...@vger.kernel.org>, linux-riscv
<linux-ri...@lists.infradead.org>, Anton Ivanov
<anton.iva...@cambridgegreys.com>, Jonas Bonn <jo...@southpole.se>, Yury Norov
<yury.no...@gmail.com>, Richard Weinberger <rich...@nod.at>, the arch/x86
maintainers <x...@kernel.org>, Russell King - ARM Linux
<li...@armlinux.org.uk>, Ingo Molnar <mi...@redhat.com>, Albert Ou
<a...@eecs.berkeley.edu>, "Paul E. McKenney" <paul...@kernel.org>, Heiko
Carstens <h...@linux.ibm.com>, Stefan Kristiansson
<stefan.kristians...@saunalahti.fi>, Openrisc <openr...@lists.librecores.org>,
Paul Walmsley <paul.walms...@sifive.com>, "open list:TEGRA ARCHITECTURE
SUPPORT" <linux-te...@vger.kernel.org>, Namhyung Kim <namhy...@kernel.org>,
Andy Shevchenko <andriy.shevche...@linux.intel.com>, jpoim...@kernel.org,
Juergen Gross <jgr...@suse.com>, Michal Simek <mon...@monstr.eu>, "open
list:BROADCOM NVRAM DRIVER" <linux-m...@vger.kernel.org>, Palmer Dabbelt
<pal...@dabbelt.com>, Anup Patel <anu
p...@brainfault.org>, Ivan Kokshaysky <i...@jurassic.park.msu.ru>, Johannes
Berg <johan...@sipsolutions.net>, linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
Errors-To: linuxppc-dev-bounces+archive=mail-archive....@lists.ozlabs.org
Sender: "Linuxppc-dev"
<linuxppc-dev-bounces+archive=mail-archive....@lists.ozlabs.org>
On Wed, Jun 8, 2022 at 4:27 PM Peter Zijlstra <pet...@infradead.org> wrote:
>
> arch_cpu_idle() is a very simple idle interface and exposes only a
> single idle state and is expected to not require RCU and not do any
> tracing/instrumentation.
>
> As such, omap_sram_idle() is not a valid implementation. Replace it
> with the simple (shallow) omap3_do_wfi() call. Leaving the more
> complicated idle states for the cpuidle driver.
>
> Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org>
I see similar code in omap2:
omap2_pm_idle()
-> omap2_enter_full_retention()
-> omap2_sram_suspend()
Is that code path safe to use without RCU or does it need a similar change?
Arnd
