linux-kernel - [PATCH V2 0/3] riscv: Enable LOCKDEP

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Message-Id: <1593266228-61125-1-git-send-email-guoren@kernel.org>
Date:   Sat, 27 Jun 2020 13:57:05 +0000
From:   guoren@...nel.org
To:     palmerdabbelt@...gle.com, paul.walmsley@...ive.com,
        anup@...infault.org, greentime.hu@...ive.com, zong.li@...ive.com,
        aou@...s.berkeley.edu, tglx@...utronix.de, tycho@...ho.ws,
        nickhu@...estech.com
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-csky@...r.kernel.org, Guo Ren <guoren@...ux.alibaba.com>
Subject: [PATCH V2 0/3] riscv: Enable LOCKDEP

From: Guo Ren <guoren@...ux.alibaba.com>

Lockdep is needed by proving the spinlocks and rwlocks. To support it,
we need to add TRACE_IRQFLAGS codes in kernel/entry.S. These patches
follow Documentation/irqflags-tracing.txt.

Fixup 2 bugs that block the lockdep implementation.

---
Changes in v2
 - Remove sX regs recovery codes which are unnecessary, because
   callee will handle them. Thx Greentime :)

 - Move "restore a0 - a7" to handle_syscall, but if _TIF_SYSCALL_WORK
   is set, "restore a1 - a7" is still duplicated. I prefer a C wrapper
   for syscall.

Guo Ren (2):
  riscv: Fixup static_obj() fail
  riscv: Enable LOCKDEP_SUPPORT & fixup TRACE_IRQFLAGS_SUPPORT

Zong Li (1):
  riscv: Fixup lockdep_assert_held with wrong param cpu_running

 arch/riscv/Kconfig              |  3 +++
 arch/riscv/kernel/entry.S       | 33 ++++++++++++++++++++++++++++++++-
 arch/riscv/kernel/smpboot.c     |  1 -
 arch/riscv/kernel/vmlinux.lds.S |  2 +-
 4 files changed, 36 insertions(+), 3 deletions(-)

-- 
2.7.4