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From: Douglas Anderson <dianders@chromium.org>
To: Jason Wessel <jason.wessel@windriver.com>,
 Daniel Thompson <daniel.thompson@linaro.org>
Subject: [PATCH v5 0/4] kgdb: Fix kgdb_roundup_cpus()
Date: Mon, 26 Nov 2018 19:51:29 -0800
Message-Id: <20181127035133.225592-1-dianders@chromium.org>
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Cc: linux-mips@linux-mips.org, Michal Hocko <mhocko@suse.com>,
 Catalin Marinas <catalin.marinas@arm.com>, linux-sh@vger.kernel.org,
 Peter Zijlstra <peterz@infradead.org>, kgdb-bugreport@lists.sourceforge.net,
 Will Deacon <will.deacon@arm.com>, linux-kernel@vger.kernel.org,
 Rich Felker <dalias@libc.org>, Paul Mackerras <paulus@samba.org>,
 "H. Peter Anvin" <hpa@zytor.com>, sparclinux@vger.kernel.org,
 Yoshinori Sato <ysato@users.sourceforge.jp>, linux-hexagon@vger.kernel.org,
 x86@kernel.org, Russell King <linux@armlinux.org.uk>,
 Ingo Molnar <mingo@redhat.com>, James Hogan <jhogan@kernel.org>,
 linux-snps-arc@lists.infradead.org, Huang Ying <ying.huang@intel.com>,
 Mike Rapoport <rppt@linux.vnet.ibm.com>, Borislav Petkov <bp@alien8.de>,
 Thomas Gleixner <tglx@linutronix.de>, linux-arm-kernel@lists.infradead.org,
 Vineet Gupta <vgupta@synopsys.com>, Douglas Anderson <dianders@chromium.org>,
 Ralf Baechle <ralf@linux-mips.org>, Richard Kuo <rkuo@codeaurora.org>,
 Paul Burton <paul.burton@mips.com>, Andrew Morton <akpm@linux-foundation.org>,
 linuxppc-dev@lists.ozlabs.org, "David S. Miller" <davem@davemloft.net>
Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org
Sender: "Linuxppc-dev"
 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

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 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