[PATCH] arm: mediatek: fix secondary CPU boot on Thumb-2 kernels with Clang - #70
Draft
akku1139 wants to merge 1 commit into
Draft
[PATCH] arm: mediatek: fix secondary CPU boot on Thumb-2 kernels with Clang#70akku1139 wants to merge 1 commit into
akku1139 wants to merge 1 commit into
Conversation
When building with CONFIG_THUMB2_KERNEL=y and Clang, secondary CPUs fail to come online with "CPU1: failed to come online". The address written to the jump register has bit 0 set, causing the secondary CPU to start in Thumb mode. secondary_startup_arm is ARM-mode code (.arm) and, on a Thumb-2 kernel, expects to be entered in ARM mode in order to switch to Thumb via the standard sequence at that label. Starting in Thumb mode causes the CPU to execute ARM instructions as Thumb, resulting in an immediate crash. Clear bit 0 of the entry address so the CPU always starts in ARM mode. Tested on Lenovo YOGA Tablet 10 (Wi-Fi). Fixes: 0cda070 ("ARM: mediatek: add smp bringup code") Assisted-by: DeepSeek:deepseek-v4-pro Cc: stable@vger.kernel.org Signed-off-by: Akari Tsuyukusa <akkun11.open@gmail.com>
Member
Author
Member
Author
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
No description provided.