APPLIED: [HIRSUTE][linux-riscv][PATCH v2 0/3] Disable ftrace of sbi functions
stefan.bader at canonical.com
Wed Aug 18 14:25:05 UTC 2021
On 18.08.21 14:14, Dimitri John Ledkov wrote:
> * A kernel build can fail to boot with Oops and illegal instruction
> as seen at
> on Unmatched board.
> * One cannot frace functions, used in frace setup. On RISC-V these
> are sbi calls to firmware from sbi.c which were not excluded for
> tracing. Similar functions on other arches are already excluded.
> * Previously we have identified one call that was racing and causing
> failure to boot and marked it for notrace. But the upstream solution
> is to disable all functions in sbi.c which was implemented in v5.12
> but did not make it to stable/earlier trees.
> * Note that this failure to boot is racy, meaning some lucky builds
> of kernel always boot or always fail, as was observed on Unmatched.
> [Test Plan]
> * Kernel should boot on baremetal Unmatched, Unleashed, and qemu
> [Where problems could occur]
> * This patch disables profiling and tracing of sbi.c function
> calls. Previously it was possible to trace them, somewhat, either
> successfully in a racy manner or to cause a kernel panic.
> BugLink: https://bugs.launchpad.net/bugs/1940426
> Changes since v1:
> * Use a new buglink
> * Add buglink to all patches
> Dimitri John Ledkov (1):
> Revert "UBUNTU: SAUCE: RISC-V: prevent sbi_send_cpumask_ipi race with
> Guo Ren (2):
> riscv: Fixup wrong ftrace remove cflag
> riscv: Fixup patch_text panic in ftrace
> arch/riscv/kernel/Makefile | 5 +++--
> arch/riscv/kernel/sbi.c | 2 +-
> arch/riscv/mm/Makefile | 3 ++-
> 3 files changed, 6 insertions(+), 4 deletions(-)
Applied to hirsute:linux-riscv/master. Thanks.
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