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Koen Kooi
aefc6c8c3c
The psp tree added a patch to limit the beaglebone to 500MHz when powered by USB, which triggered conflicts in the patches. The 3.2.16 series has been rediffed as well, no functional changes. Signed-off-by: Koen Kooi <koen@dominion.thruhere.net> Signed-off-by: Denys Dmytriyenko <denys@ti.com>
64 lines
2.2 KiB
Diff
64 lines
2.2 KiB
Diff
From 05ab1d059eb55460d5bafab622493a9c7d2b879f Mon Sep 17 00:00:00 2001
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From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
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Date: Fri, 13 Apr 2012 03:35:13 +0000
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Subject: [PATCH 19/68] sparc64: Eliminate obsolete __handle_softirq()
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function
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commit 3d3eeb2ef26112a200785e5fca58ec58dd33bf1e upstream.
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The invocation of softirq is now handled by irq_exit(), so there is no
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need for sparc64 to invoke it on the trap-return path. In fact, doing so
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is a bug because if the trap occurred in the idle loop, this invocation
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can result in lockdep-RCU failures. The problem is that RCU ignores idle
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CPUs, and the sparc64 trap-return path to the softirq handlers fails to
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tell RCU that the CPU must be considered non-idle while those handlers
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are executing. This means that RCU is ignoring any RCU read-side critical
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sections in those handlers, which in turn means that RCU-protected data
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can be yanked out from under those read-side critical sections.
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The shiny new lockdep-RCU ability to detect RCU read-side critical sections
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that RCU is ignoring located this problem.
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The fix is straightforward: Make sparc64 stop manually invoking the
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softirq handlers.
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Reported-by: Meelis Roos <mroos@linux.ee>
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Suggested-by: David Miller <davem@davemloft.net>
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Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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Tested-by: Meelis Roos <mroos@linux.ee>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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arch/sparc/kernel/rtrap_64.S | 7 -------
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1 file changed, 7 deletions(-)
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diff --git a/arch/sparc/kernel/rtrap_64.S b/arch/sparc/kernel/rtrap_64.S
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index 77f1b95..9171fc2 100644
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--- a/arch/sparc/kernel/rtrap_64.S
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+++ b/arch/sparc/kernel/rtrap_64.S
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@@ -20,11 +20,6 @@
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.text
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.align 32
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-__handle_softirq:
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- call do_softirq
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- nop
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- ba,a,pt %xcc, __handle_softirq_continue
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- nop
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__handle_preemption:
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call schedule
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wrpr %g0, RTRAP_PSTATE, %pstate
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@@ -89,9 +84,7 @@ rtrap:
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cmp %l1, 0
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/* mm/ultra.S:xcall_report_regs KNOWS about this load. */
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- bne,pn %icc, __handle_softirq
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ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
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-__handle_softirq_continue:
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rtrap_xcall:
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sethi %hi(0xf << 20), %l4
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and %l1, %l4, %l4
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--
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1.7.10
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