kernel/git/stable/linux-stable.git/Documentation, branch linux-rolling-lts

cpufreq/amd-pstate: Add support for raw EPP writes

2026-09-14T11:36:19+00:00

[ Upstream commit 6927f21852f38db2975b5d5539cbe5241c25a99b ] The energy performance preference field of the CPPC request MSR supports values from 0 to 255, but the strings only offer 4 values. The other values are useful for tuning the performance of some workloads. Add support for writing the raw energy performance preference value to the sysfs file. If the last value written was an integer then an integer will be returned. If the last value written was a string then a string will be returned. Reviewed-by: Gautham R. Shenoy Signed-off-by: Mario Limonciello (AMD) Stable-dep-of: caa822d312be ("cpufreq/amd-pstate: Use "epp_default_dc" as default when dynamic_epp is disabled") Signed-off-by: Sasha Levin

devlink: Introduce switchdev_inactive eswitch mode

2026-09-14T11:36:06+00:00

[ Upstream commit 0e535824d0bcf7c9bb0532d902283c31c78cd6f3 ] Adds DEVLINK_ESWITCH_MODE_SWITCHDEV_INACTIVE attribute to UAPI and documentation. Before having traffic flow through an eswitch, a user may want to have the ability to block traffic towards the FDB until FDB is fully programmed and the user is ready to send traffic to it. For example: when two eswitches are present for vports in a multi-PF setup, one eswitch may take over the traffic from the other when the user chooses. Before this take over, a user may want to first program the inactive eswitch and then once ready redirect traffic to this new eswitch. switchdev modes transition semantics: legacy->switchdev_inactive: Create switchdev mode normally, traffic not allowed to flow yet. switchdev_inactive->switchdev: Enable traffic to flow. switchdev->switchdev_inactive: Block traffic on the FDB, FDB and representros state and content is preserved. When eswitch is configured to this mode, traffic is ignored/dropped on this eswitch FDB, while current configuration is kept, e.g FDB rules and netdev representros are kept available, FDB programming is allowed. Example: # start inactive switchdev devlink dev eswitch set pci/0000:08:00.1 mode switchdev_inactive # setup TC rules, representors etc .. # activate devlink dev eswitch set pci/0000:08:00.1 mode switchdev Signed-off-by: Saeed Mahameed Reviewed-by: Jiri Pirko Link: https://patch.msgid.link/20251108070404.1551708-2-saeed@kernel.org Signed-off-by: Paolo Abeni Stable-dep-of: ff0f9b7aa1c7 ("net/mlx5: E-Switch, use state lock for vport state changes") Signed-off-by: Sasha Levin

hwmon: (emc1403) Drop hysteresis for low limit temperature

2026-09-14T11:35:58+00:00

[ Upstream commit 75f2c0b3690702c90863c2e138cb5520670845ea ] Remove the hysteresis for low temperature limit, in hardware the hysteresis is applied only to the maxim limit and the critical limit temperature. Fixes: 54392ce4446e3 ("hwmon: (emc1403) Add support for min_hyst attributes") Signed-off-by: Marius Cristea Link: https://lore.kernel.org/r/20260813-emc1403_remove_min_hyst-v1-1-43a0d05d9f49@microchip.com [groeck: Updated subject] Signed-off-by: Guenter Roeck Signed-off-by: Sasha Levin

hwmon: Support guard() and scoped_guard for subsystem locks

2026-09-14T11:35:48+00:00

[ Upstream commit d1e720c7328e046049b792d03fae093d4d3a72e4 ] Add support for guard() and scoped_guard() for the hwmon subsystem lock to simplify its use. Signed-off-by: Guenter Roeck Stable-dep-of: 26db27364088 ("hwmon: (cros_ec) Synchronize EC access from the thermal device callbacks") Signed-off-by: Sasha Levin

hwmon: (cros_ec) Add support for temperature thresholds

2026-09-14T11:35:48+00:00

[ Upstream commit afa7c56ec447315ab38182bb9c185d8ea712c3ad ] Implement reading temperature thresholds through EC_CMD_THERMAL_GET_THRESHOLD/EC_CMD_THERMAL_SET_THRESHOLD. Thresholds are mapped as follows between the EC and hwmon: hwmon_temp_max - EC_TEMP_THRESH_WARN hwmon_temp_crit - EC_TEMP_THRESH_HIGH hwmon_temp_emergency - EC_TEMP_THRESH_HALT Signed-off-by: Thomas Weißschuh Reviewed-by: Tzung-Bi Shih Link: https://lore.kernel.org/r/20260118-cros_ec-hwmon-pwm-v2-4-77eb1709b031@weissschuh.net [groeck: Rearrange code to no longer use unreachable() since that causes a hiccup with some versions of gcc and objtool] Signed-off-by: Guenter Roeck Stable-dep-of: 26db27364088 ("hwmon: (cros_ec) Synchronize EC access from the thermal device callbacks") Signed-off-by: Sasha Levin

hwmon: (cros_ec) Split up supported features in the documentation

2026-09-14T11:35:48+00:00

[ Upstream commit 18ccf48656e010838075fd00caa6d93d3f95d106 ] The wall of text of supported features is hard to read and messy to extend. Split it into a definition list with an explanations for each supported feature. Signed-off-by: Thomas Weißschuh Reviewed-by: Tzung-Bi Shih Link: https://lore.kernel.org/r/20260118-cros_ec-hwmon-pwm-v2-1-77eb1709b031@weissschuh.net Signed-off-by: Guenter Roeck Stable-dep-of: 26db27364088 ("hwmon: (cros_ec) Synchronize EC access from the thermal device callbacks") Signed-off-by: Sasha Levin

dm-integrity: replace forgeable discard filler with a keyed sector marker

2026-09-14T11:35:32+00:00

[ Upstream commit 68c5c42567bc462139128968ebbfadd0aefff519 ] The discard-block check in dm_integrity_rw_tag() treats a stored tag of all 0xf6 bytes (DISCARD_FILLER) as proof a block was discarded and skips HMAC verification. allow_discards is only accepted in dm-integrity's standalone mode. An attacker with raw write access to the backing device, but without the integrity key, can stamp any block with an all-0xf6 tag and have it served as authentic. Add a new "allow_discards_keyed" target argument that marks discarded blocks with a keyed checksum of (salt || sector) instead, computed by integrity_discard_checksum(). Fixes: 84597a44a9d8 ("dm integrity: add optional discard support") Co-developed-by: Jo Van Bulck Signed-off-by: Jo Van Bulck Signed-off-by: Shukai Ni Signed-off-by: Mikulas Patocka Signed-off-by: Sasha Levin

cpufreq/amd-pstate: Add support for platform profile class

2026-09-14T11:35:06+00:00

[ Upstream commit 798c47593ccae7dd36c033e557f3f364a2056b9e ] The platform profile core allows multiple drivers and devices to register platform profile support. When the legacy platform profile interface is used all drivers will adjust the platform profile as well. Add support for registering every CPU with the platform profile handler when dynamic EPP is enabled. The end result will be that changing the platform profile will modify EPP accordingly. Reviewed-by: Gautham R. Shenoy Signed-off-by: Mario Limonciello (AMD) Stable-dep-of: 57476909c300 ("cpufreq/amd-pstate: Fix EPP return type and handle errors during initialization") Signed-off-by: Sasha Levin

cpufreq/amd-pstate: Add dynamic energy performance preference

2026-09-14T11:35:06+00:00

[ Upstream commit e30ca6dd5345c5b8ba05f346a8e81105352fe571 ] Dynamic energy performance preference changes the EPP profile based on whether the machine is running on AC or DC power. A notification chain from the power supply core is used to adjust EPP values on plug in or plug out events. When enabled, the driver exposes a sysfs toggle for dynamic EPP, blocks manual writes to energy_performance_preference while it "owns" the EPP updates. For non-server systems: * the default EPP for AC mode is `performance`. * the default EPP for DC mode is `balance_performance`. For server systems dynamic EPP is mostly a no-op. Reviewed-by: Gautham R. Shenoy Signed-off-by: Mario Limonciello (AMD) Stable-dep-of: 57476909c300 ("cpufreq/amd-pstate: Fix EPP return type and handle errors during initialization") Signed-off-by: Sasha Levin

usb: gadget: f_uac1_legacy: remove broken string configfs attributes

2026-09-14T11:34:44+00:00

[ Upstream commit 590d74ec8f488e06b9f1c0f8f0941f45531f3a55 ] The UAC1_STR_ATTRIBUTE macro defines configfs show/store handlers for the fn_play, fn_cap, and fn_cntl string options. The store function contains an inverted null check on the kstrndup() return value. This means every write attempt returns -ENOMEM on success and dereferences a NULL pointer on allocation failure. The attributes have been broken and unused for many years. Remove the UAC1_STR_ATTRIBUTE macro and the three attributes it generated. The internal defaults (FILE_PCM_PLAYBACK, FILE_PCM_CAPTURE, FILE_CONTROL) set in f_audio_alloc_inst() are unaffected. Fixes: 0854611a19ae ("usb: gadget: f_uac1: add configfs support") Link: https://lore.kernel.org/linux-usb/20260625113154.1954813-1-xu.yang_2@oss.nxp.com/ Suggested-by: Greg Kroah-Hartman Assisted-by: Claude:claude-sonnet-4.6 Signed-off-by: Xu Yang Reviewed-by: Frank Li Link: https://patch.msgid.link/20260713060845.3759673-1-xu.yang_2@oss.nxp.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin