linux-kernel - [PATCH 1/5] MIPS: kdb: Remove old workaround for backtracing on other CPUs

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Date:   Sat,  9 Nov 2019 11:16:40 -0800
From:   Douglas Anderson <dianders@...omium.org>
To:     Paul Burton <paul.burton@...s.com>,
        Jason Wessel <jason.wessel@...driver.com>,
        Daniel Thompson <daniel.thompson@...aro.org>
Cc:     qiaochong@...ngson.cn, kgdb-bugreport@...ts.sourceforge.net,
        ralf@...ux-mips.org, Douglas Anderson <dianders@...omium.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        James Hogan <jhogan@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        Philippe Mathieu-Daudé <f4bug@...at.org>,
        Serge Semin <fancer.lancer@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 1/5] MIPS: kdb: Remove old workaround for backtracing on other CPUs

As of commit 2277b492582d ("kdb: Fix stack crawling on 'running' CPUs
that aren't the master") we no longer need any special case for doing
stack dumps on CPUs that are not the kdb master.  Let's remove.

Signed-off-by: Douglas Anderson <dianders@...omium.org>
---
I have no way to test this personally, so hopefully someone who uses
kdb/kgdb on MIPS can.

Ideally this patch should be Acked by MIPS folks and then land through
the kdb/kgdb tree since the next patch in the series, ("kdb:
kdb_current_regs should be private") depends on it.

 arch/mips/kernel/traps.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 342e41de9d64..46fbcfeaae9a 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -210,11 +210,6 @@ void show_stack(struct task_struct *task, unsigned long *sp)
 			regs.regs[29] = task->thread.reg29;
 			regs.regs[31] = 0;
 			regs.cp0_epc = task->thread.reg31;
-#ifdef CONFIG_KGDB_KDB
-		} else if (atomic_read(&kgdb_active) != -1 &&
-			   kdb_current_regs) {
-			memcpy(&regs, kdb_current_regs, sizeof(regs));
-#endif /* CONFIG_KGDB_KDB */
 		} else {
 			prepare_frametrace(&regs);
 		}
-- 
2.24.0.432.g9d3f5f5b63-goog