From: Lukasz Luba <lukasz.luba@arm.com>
To: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
rafael@kernel.org
Cc: lukasz.luba@arm.com, dietmar.eggemann@arm.com,
rui.zhang@intel.com, amit.kucheria@verdurent.com,
amit.kachhap@gmail.com, daniel.lezcano@linaro.org,
viresh.kumar@linaro.org, len.brown@intel.com, pavel@ucw.cz,
Pierre.Gondois@arm.com, ionela.voinescu@arm.com,
rostedt@goodmis.org, mhiramat@kernel.org
Subject: [PATCH 07/17] PM: EM: Check if the get_cost() callback is present in em_compute_costs()
Date: Tue, 14 Mar 2023 10:33:47 +0000 [thread overview]
Message-ID: <20230314103357.26010-8-lukasz.luba@arm.com> (raw)
In-Reply-To: <20230314103357.26010-1-lukasz.luba@arm.com>
The em_compute_cost() is going to be re-used in runtime modified EM
code path. Thus, make sure that this common code is safe and won't
try to use the NULL pointer. The former em_compute_cost() didn't have to
care about runtime modification code path. The upcoming changes introduce
such option, but with different callback. Those two paths which use
get_cost() (during first EM registration) or update_power() (during
runtime modification) need to be safely handled in em_compute_costs().
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
---
kernel/power/energy_model.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c
index 3b778743ba89..230310709e2a 100644
--- a/kernel/power/energy_model.c
+++ b/kernel/power/energy_model.c
@@ -122,7 +122,7 @@ static int em_compute_costs(struct device *dev, struct em_perf_state *table,
for (i = nr_states - 1; i >= 0; i--) {
unsigned long power_res, cost;
- if (flags & EM_PERF_DOMAIN_ARTIFICIAL) {
+ if (flags & EM_PERF_DOMAIN_ARTIFICIAL && cb->get_cost) {
ret = cb->get_cost(dev, table[i].frequency, &cost);
if (ret || !cost || cost > EM_MAX_POWER) {
dev_err(dev, "EM: invalid cost %lu %d\n",
--
2.17.1
next prev parent reply other threads:[~2023-03-14 10:36 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-14 10:33 [PATCH 00/17] Introduce runtime modifiable Energy Model Lukasz Luba
2023-03-14 10:33 ` [PATCH 01/17] PM: EM: Refactor em_cpufreq_update_efficiencies() arguments Lukasz Luba
2023-03-27 17:16 ` Rafael J. Wysocki
2023-04-11 15:43 ` Pierre Gondois
2023-05-10 7:00 ` Lukasz Luba
2023-04-18 22:41 ` Lukasz Luba
2023-03-14 10:33 ` [PATCH 02/17] PM: EM: Find first CPU online while updating OPP efficiency Lukasz Luba
2023-04-11 15:40 ` Pierre Gondois
2023-05-10 7:08 ` Lukasz Luba
2023-05-15 8:47 ` Pierre Gondois
2023-03-14 10:33 ` [PATCH 03/17] PM: EM: Refactor em_pd_get_efficient_state() to be more flexible Lukasz Luba
2023-03-14 10:33 ` [PATCH 04/17] PM: EM: Create a new function em_compute_costs() Lukasz Luba
2023-03-14 10:33 ` [PATCH 05/17] trace: energy_model: Add trace event for EM runtime modifications Lukasz Luba
2023-04-11 15:39 ` Pierre Gondois
2023-05-10 6:59 ` Lukasz Luba
2023-03-14 10:33 ` [PATCH 06/17] PM: EM: Add update_power() callback for " Lukasz Luba
2023-03-14 10:33 ` Lukasz Luba [this message]
2023-03-14 10:33 ` [PATCH 08/17] PM: EM: Introduce runtime modifiable table Lukasz Luba
2023-03-14 10:33 ` [PATCH 09/17] PM: EM: Add RCU mechanism which safely cleans the old data Lukasz Luba
2023-03-14 10:33 ` [PATCH 10/17] PM: EM: Add runtime update interface to modify EM power Lukasz Luba
2023-04-11 15:40 ` Pierre Gondois
2023-05-10 6:55 ` Lukasz Luba
2023-05-15 8:48 ` Pierre Gondois
2023-03-14 10:33 ` [PATCH 11/17] PM: EM: Use runtime modified EM for CPUs energy estimation in EAS Lukasz Luba
2023-03-14 10:33 ` [PATCH 12/17] PM: EM: Add argument to get_cost() for runtime modification Lukasz Luba
2023-03-14 10:33 ` [PATCH 13/17] PM: EM: Refactor struct em_perf_domain and add default_table Lukasz Luba
2023-03-15 11:32 ` kernel test robot
2023-03-21 11:30 ` Lukasz Luba
2023-03-14 10:33 ` [PATCH 14/17] Documentation: EM: Add a new section about the design Lukasz Luba
2023-03-14 10:33 ` [PATCH 15/17] Documentation: EM: Add a runtime modifiable EM design description Lukasz Luba
2023-03-14 10:33 ` [PATCH 16/17] Documentation: EM: Add example with driver modifying the EM Lukasz Luba
2023-03-14 10:33 ` [PATCH 17/17] Documentation: EM: Describe the API of runtime modifications Lukasz Luba
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20230314103357.26010-8-lukasz.luba@arm.com \
--to=lukasz.luba@arm.com \
--cc=Pierre.Gondois@arm.com \
--cc=amit.kachhap@gmail.com \
--cc=amit.kucheria@verdurent.com \
--cc=daniel.lezcano@linaro.org \
--cc=dietmar.eggemann@arm.com \
--cc=ionela.voinescu@arm.com \
--cc=len.brown@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=mhiramat@kernel.org \
--cc=pavel@ucw.cz \
--cc=rafael@kernel.org \
--cc=rostedt@goodmis.org \
--cc=rui.zhang@intel.com \
--cc=viresh.kumar@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®