linux-kernel - [PATCH v6 0/4] kgdb: Fix kgdb_roundup

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Message-Id: <20181127173839.34328-1-dianders@chromium.org>
Date:   Tue, 27 Nov 2018 09:38:35 -0800
From:   Douglas Anderson <dianders@...omium.org>
To:     Jason Wessel <jason.wessel@...driver.com>,
        Daniel Thompson <daniel.thompson@...aro.org>
Cc:     Will Deacon <will.deacon@....com>,
        kgdb-bugreport@...ts.sourceforge.net,
        Peter Zijlstra <peterz@...radead.org>,
        Douglas Anderson <dianders@...omium.org>,
        linux-mips@...ux-mips.org, linux-sh@...r.kernel.org,
        Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org,
        sparclinux@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        James Hogan <jhogan@...nel.org>, linux-hexagon@...r.kernel.org,
        x86@...nel.org, Vineet Gupta <vgupta@...opsys.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Michal Hocko <mhocko@...e.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        linux-snps-arc@...ts.infradead.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Burton <paul.burton@...s.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Ingo Molnar <mingo@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org,
        Christophe Leroy <christophe.leroy@....fr>,
        Huang Ying <ying.huang@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Rich Felker <dalias@...c.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Paul Mackerras <paulus@...ba.org>,
        Richard Kuo <rkuo@...eaurora.org>,
        linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v6 0/4] kgdb: Fix kgdb_roundup_cpus()

This series was originally part of the series ("serial: Finish kgdb on
qcom_geni; fix many lockdep splats w/ kgdb") but it made sense to
split it up.

It's believed that dropping into kgdb should be more robust once these
patches are applied.

Changes in v6:
- Moved smp_call_function_single_async() error check to patch 3.

Changes in v5:
- Add a comment about get_irq_regs().
- get_cpu() => raw_smp_processor_id() in kgdb_roundup_cpus().
- for_each_cpu() => for_each_online_cpu()
- Error check smp_call_function_single_async()

Changes in v4:
- Removed smp_mb() calls.
- Also clear out .debuggerinfo.
- Also clear out .debuggerinfo and .task for the master.
- Remove clearing out in kdb_stub for offline CPUs; it's now redundant.

Changes in v3:
- No separate init call.
- Don't round up the CPU that is doing the rounding up.
- Add "#ifdef CONFIG_SMP" to match the rest of the file.
- Updated desc saying we don't solve the "failed to roundup" case.
- Document the ignored parameter.
- Don't round up a CPU that failed rounding up before new for v3.
- Don't back trace on a cpu that didn't round up new for v3.

Changes in v2:
- Removing irq flags separated from fixing lockdep splat.
- Don't use smp_call_function (Daniel).

Douglas Anderson (4):
  kgdb: Remove irq flags from roundup
  kgdb: Fix kgdb_roundup_cpus() for arches who used smp_call_function()
  kgdb: Don't round up a CPU that failed rounding up before
  kdb: Don't back trace on a cpu that didn't round up

 arch/arc/kernel/kgdb.c          | 10 +----
 arch/arm/kernel/kgdb.c          | 12 ------
 arch/arm64/kernel/kgdb.c        | 12 ------
 arch/hexagon/kernel/kgdb.c      | 32 ----------------
 arch/mips/kernel/kgdb.c         |  9 +----
 arch/powerpc/kernel/kgdb.c      |  6 +--
 arch/sh/kernel/kgdb.c           | 12 ------
 arch/sparc/kernel/smp_64.c      |  2 +-
 arch/x86/kernel/kgdb.c          |  9 +----
 include/linux/kgdb.h            | 22 +++++++----
 kernel/debug/debug_core.c       | 65 ++++++++++++++++++++++++++++++++-
 kernel/debug/debug_core.h       |  1 +
 kernel/debug/kdb/kdb_bt.c       | 11 +++++-
 kernel/debug/kdb/kdb_debugger.c |  7 ----
 14 files changed, 98 insertions(+), 112 deletions(-)

-- 
2.20.0.rc0.387.gc7a69e6b6c-goog