start following git head again
This commit is contained in:
Kyle McMartin
parent
a791768570
commit
c22cea221f
4
Makefile
4
Makefile
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@ -82,7 +82,7 @@ debug:
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@perl -pi -e 's/# CONFIG_DEBUG_STRICT_USER_COPY_CHECKS is not set/CONFIG_DEBUG_STRICT_USER_COPY_CHECKS=y/' config-nodebug
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@perl -pi -e 's/# CONFIG_DMADEVICES_DEBUG is not set/CONFIG_DMADEVICES_DEBUG=y/' config-nodebug
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@perl -pi -e 's/# CONFIG_DMADEVICES_VDEBUG is not set/CONFIG_DMADEVICES_VDEBUG=y/' config-nodebug
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@perl -pi -e 's/# CONFIG_CEPH_FS_PRETTYDEBUG is not set/CONFIG_CEPH_FS_PRETTYDEBUG=y/' config-nodebug
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@perl -pi -e 's/# CONFIG_CEPH_LIB_PRETTYDEBUG is not set/CONFIG_CEPH_LIB_PRETTYDEBUG=y/' config-nodebug
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@perl -pi -e 's/# CONFIG_QUOTA_DEBUG is not set/CONFIG_QUOTA_DEBUG=y/' config-nodebug
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@perl -pi -e 's/# CONFIG_KGDB_KDB is not set/CONFIG_KGDB_KDB=y/' config-nodebug
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@perl -pi -e 's/# CONFIG_KDB_KEYBOARD is not set/CONFIG_KDB_KEYBOARD=y/' config-nodebug
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@ -154,7 +154,7 @@ release:
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@perl -pi -e 's/CONFIG_DEBUG_STRICT_USER_COPY_CHECKS=y/# CONFIG_DEBUG_STRICT_USER_COPY_CHECKS is not set/' config-nodebug
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@perl -pi -e 's/CONFIG_DMADEVICES_DEBUG=y/# CONFIG_DMADEVICES_DEBUG is not set/' config-nodebug
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@perl -pi -e 's/CONFIG_DMADEVICES_VDEBUG=y/# CONFIG_DMADEVICES_VDEBUG is not set/' config-nodebug
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@perl -pi -e 's/CONFIG_CEPH_FS_PRETTYDEBUG=y/# CONFIG_CEPH_FS_PRETTYDEBUG is not set/' config-nodebug
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@perl -pi -e 's/CONFIG_CEPH_LIB_PRETTYDEBUG=y/# CONFIG_CEPH_LIB_PRETTYDEBUG is not set/' config-nodebug
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@perl -pi -e 's/CONFIG_QUOTA_DEBUG=y/# CONFIG_QUOTA_DEBUG is not set/' config-nodebug
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@perl -pi -e 's/CONFIG_CPU_NOTIFIER_ERROR_INJECT=m/# CONFIG_CPU_NOTIFIER_ERROR_INJECT is not set/' config-nodebug
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#@perl -pi -e 's/CONFIG_KGDB_KDB=y/# CONFIG_KGDB_KDB is not set/' config-nodebug
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@ -122,3 +122,8 @@ CONFIG_AUTO_ZRELADDR=y
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# CONFIG_DEPRECATED_PARAM_STRUCT is not set
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# CONFIG_ARM_SP805_WATCHDOG is not set
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CONFIG_PM_OPP=y
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CONFIG_SECCOMP=y
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CONFIG_STRICT_DEVMEM=y
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@ -84,7 +84,7 @@ CONFIG_DMADEVICES_VDEBUG=y
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CONFIG_PM_ADVANCED_DEBUG=y
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CONFIG_CEPH_FS_PRETTYDEBUG=y
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CONFIG_CEPH_LIB_PRETTYDEBUG=y
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CONFIG_QUOTA_DEBUG=y
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# CONFIG_CRYPTO_MANAGER_DISABLE_TESTS is not set
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@ -3348,6 +3348,8 @@ CONFIG_EXOFS_FS=m
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CONFIG_NILFS2_FS=m
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CONFIG_LOGFS=m
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CONFIG_CEPH_FS=m
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CONFIG_BLK_DEV_RBD=m
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CONFIG_CEPH_LIB=m
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CONFIG_FSCACHE=m
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CONFIG_FSCACHE_STATS=y
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@ -4334,3 +4336,7 @@ CONFIG_IR_STREAMZAP=m
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# CONFIG_MFD_STMPE is not set
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# CONFIG_MFD_MAX8998 is not set
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# CONFIG_MFD_TPS6586X is not set
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CONFIG_SPARSE_RCU_POINTER=y
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# CONFIG_PM_OPP is not set
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@ -84,7 +84,7 @@ CONFIG_DMADEVICES_VDEBUG=y
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CONFIG_PM_ADVANCED_DEBUG=y
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CONFIG_CEPH_FS_PRETTYDEBUG=y
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CONFIG_CEPH_LIB_PRETTYDEBUG=y
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CONFIG_QUOTA_DEBUG=y
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# CONFIG_CRYPTO_MANAGER_DISABLE_TESTS is not set
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@ -228,3 +228,5 @@ CONFIG_SMSGIUCV_EVENT=m
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CONFIG_VMCP=y
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CONFIG_ZFCP_DIF=y
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CONFIG_SCHED_BOOK=y
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@ -507,3 +507,8 @@ CONFIG_XEN_PLATFORM_PCI=m
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CONFIG_IDEAPAD_ACPI=m
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CONFIG_INTEL_IPS=m
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CONFIG_OLPC_XO1=m
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CONFIG_EDAC_MCE_INJ=m
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CONFIG_IRQ_TIME_ACCOUNTING=y
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CONFIG_X86_RESERVE_LOW=64
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@ -419,3 +419,7 @@ CONFIG_XEN_PLATFORM_PCI=m
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# CONFIG_ACPI_QUICKSTART is not set
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CONFIG_IDEAPAD_ACPI=m
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CONFIG_INTEL_IPS=m
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CONFIG_EDAC_MCE_INJ=m
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CONFIG_IRQ_TIME_ACCOUNTING=y
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CONFIG_X86_RESERVE_LOW=64
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15
kernel.spec
15
kernel.spec
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@ -6,7 +6,7 @@ Summary: The Linux kernel
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# For a stable, released kernel, released_kernel should be 1. For rawhide
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# and/or a kernel built from an rc or git snapshot, released_kernel should
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# be 0.
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%global released_kernel 1
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%global released_kernel 0
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# Save original buildid for later if it's defined
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%if 0%{?buildid:1}
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@ -82,9 +82,9 @@ Summary: The Linux kernel
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# The next upstream release sublevel (base_sublevel+1)
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%define upstream_sublevel %(echo $((%{base_sublevel} + 1)))
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# The rc snapshot level
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%define rcrev 8
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%define rcrev 0
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# The git snapshot level
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%define gitrev 5
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%define gitrev 2
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# Set rpm version accordingly
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%define rpmversion 2.6.%{upstream_sublevel}
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%endif
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@ -680,8 +680,6 @@ Patch2912: linux-2.6-v4l-dvb-ir-core-update.patch
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#Patch2916: lirc-staging-2.6.36-fixes.patch
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Patch2917: hdpvr-ir-enable.patch
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Patch3000: linux-2.6-rcu-sched-warning.patch
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# fs fixes
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# NFSv4
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@ -1298,9 +1296,6 @@ ApplyOptionalPatch linux-2.6-v4l-dvb-experimental.patch
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# enable IR receiver on Hauppauge HD PVR (v4l-dvb merge pending)
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ApplyPatch hdpvr-ir-enable.patch
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# silence another rcu_reference warning
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ApplyPatch linux-2.6-rcu-sched-warning.patch
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# Patches headed upstream
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ApplyPatch disable-i8042-check-on-apple-mac.patch
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@ -1952,6 +1947,10 @@ fi
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# || ||
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%changelog
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* Fri Oct 22 2010 Kyle McMartin <kyle@redhat.com> 2.6.37-0.1.rc0.git2
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- Switch to tracking git snapshots of what will become 2.6.37.
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- Fix context rejects in utrace and a few other patches.
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* Wed Oct 20 2010 Chuck Ebbert <cebbert@redhat.com> 2.6.36-1
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- Linux 2.6.36
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@ -394,8 +394,8 @@
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--- a/arch/x86/mm/tlb.c
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+++ b/arch/x86/mm/tlb.c
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@@ -6,6 +6,7 @@
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/cpu.h>
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+#include <asm/desc.h>
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#include <asm/tlbflush.h>
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@ -1,215 +0,0 @@
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|||
From davej Thu Sep 16 11:55:58 2010
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||||
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||||
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id 6DCDB100AEB1D; Thu, 16 Sep 2010 17:50:32 +0200 (CEST)
|
||||
Subject: Re: 2.6.35-stable/ppc64/p7: suspicious rcu_dereference_check()
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||||
usage detected during 2.6.35-stable boot
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||||
From: Peter Zijlstra <peterz@infradead.org>
|
||||
To: paulmck@linux.vnet.ibm.com
|
||||
Cc: Subrata Modak <subrata@linux.vnet.ibm.com>,
|
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linux-kernel <linux-kernel@vger.kernel.org>,
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Li Zefan <lizf@cn.fujitsu.com>, Linuxppc-dev <Linuxppc-dev@ozlabs.org>,
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sachinp <sachinp@linux.vnet.ibm.com>,
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DIVYA PRAKASH <dipraksh@linux.vnet.ibm.com>,
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"Valdis.Kletnieks" <Valdis.Kletnieks@vt.edu>
|
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In-Reply-To: <20100809161200.GC3026@linux.vnet.ibm.com>
|
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References: <1280739132.15317.9.camel@subratamodak.linux.ibm.com>
|
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<20100809161200.GC3026@linux.vnet.ibm.com>
|
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|
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Date: Thu, 16 Sep 2010 17:50:31 +0200
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X-Scanned-By: MIMEDefang 2.67 on 10.5.11.16
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Status: RO
|
||||
Content-Length: 6752
|
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Lines: 145
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On Mon, 2010-08-09 at 09:12 -0700, Paul E. McKenney wrote:
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> > [ 0.051203] CPU0: AMD QEMU Virtual CPU version 0.12.4 stepping 03
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> > [ 0.052999] lockdep: fixing up alternatives.
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> > [ 0.054105]
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> > [ 0.054106] ===================================================
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> > [ 0.054999] [ INFO: suspicious rcu_dereference_check() usage. ]
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> > [ 0.054999] ---------------------------------------------------
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> > [ 0.054999] kernel/sched.c:616 invoked rcu_dereference_check() without protection!
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> > [ 0.054999]
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> > [ 0.054999] other info that might help us debug this:
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> > [ 0.054999]
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> > [ 0.054999]
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> > [ 0.054999] rcu_scheduler_active = 1, debug_locks = 1
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> > [ 0.054999] 3 locks held by swapper/1:
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> > [ 0.054999] #0: (cpu_add_remove_lock){+.+.+.}, at: [<ffffffff814be933>] cpu_up+0x42/0x6a
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> > [ 0.054999] #1: (cpu_hotplug.lock){+.+.+.}, at: [<ffffffff810400d8>] cpu_hotplug_begin+0x2a/0x51
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> > [ 0.054999] #2: (&rq->lock){-.-...}, at: [<ffffffff814be2f7>] init_idle+0x2f/0x113
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> > [ 0.054999]
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> > [ 0.054999] stack backtrace:
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> > [ 0.054999] Pid: 1, comm: swapper Not tainted 2.6.35 #1
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> > [ 0.054999] Call Trace:
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> > [ 0.054999] [<ffffffff81068054>] lockdep_rcu_dereference+0x9b/0xa3
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> > [ 0.054999] [<ffffffff810325c3>] task_group+0x7b/0x8a
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> > [ 0.054999] [<ffffffff810325e5>] set_task_rq+0x13/0x40
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> > [ 0.054999] [<ffffffff814be39a>] init_idle+0xd2/0x113
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> > [ 0.054999] [<ffffffff814be78a>] fork_idle+0xb8/0xc7
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> > [ 0.054999] [<ffffffff81068717>] ? mark_held_locks+0x4d/0x6b
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> > [ 0.054999] [<ffffffff814bcebd>] do_fork_idle+0x17/0x2b
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> > [ 0.054999] [<ffffffff814bc89b>] native_cpu_up+0x1c1/0x724
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> > [ 0.054999] [<ffffffff814bcea6>] ? do_fork_idle+0x0/0x2b
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||||
> > [ 0.054999] [<ffffffff814be876>] _cpu_up+0xac/0x127
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||||
> > [ 0.054999] [<ffffffff814be946>] cpu_up+0x55/0x6a
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||||
> > [ 0.054999] [<ffffffff81ab562a>] kernel_init+0xe1/0x1ff
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||||
> > [ 0.054999] [<ffffffff81003854>] kernel_thread_helper+0x4/0x10
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||||
> > [ 0.054999] [<ffffffff814c353c>] ? restore_args+0x0/0x30
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||||
> > [ 0.054999] [<ffffffff81ab5549>] ? kernel_init+0x0/0x1ff
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||||
> > [ 0.054999] [<ffffffff81003850>] ? kernel_thread_helper+0x0/0x10
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||||
> > [ 0.056074] Booting Node 0, Processors #1lockdep: fixing up alternatives.
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> > [ 0.130045] #2lockdep: fixing up alternatives.
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> > [ 0.203089] #3 Ok.
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> > [ 0.275286] Brought up 4 CPUs
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> > [ 0.276005] Total of 4 processors activated (16017.17 BogoMIPS).
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>
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> This does look like a new one, thank you for reporting it!
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>
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||||
> Here is my analysis, which should at least provide some humor value to
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> those who understand the code better than I do. ;-)
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>
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||||
> So the corresponding rcu_dereference_check() is in
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> task_subsys_state_check(), and is fetching the cpu_cgroup_subsys_id
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> element of the newly created task's task->cgroups->subsys[] array.
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> The "git grep" command finds only three uses of cpu_cgroup_subsys_id,
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> but no definition.
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||||
>
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||||
> Now, fork_idle() invokes copy_process(), which invokes cgroup_fork(),
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> which sets the child process's ->cgroups pointer to that of the parent,
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||||
> also invoking get_css_set(), which increments the corresponding reference
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> count, doing both operations under task_lock() protection (->alloc_lock).
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> Because fork_idle() does not specify any of CLONE_NEWNS, CLONE_NEWUTS,
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> CLONE_NEWIPC, CLONE_NEWPID, or CLONE_NEWNET, copy_namespaces() should
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> not create a new namespace, and so there should be no ns_cgroup_clone().
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> We should thus retain the parent's ->cgroups pointer. And copy_process()
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> installs the new task in the various lists, so that the task is externally
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> accessible upon return.
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>
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> After a non-error return from copy_process(), fork_init() invokes
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> init_idle_pid(), which does not appear to affect the task's cgroup
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> state. Next fork_init() invokes init_idle(), which in turn invokes
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> __set_task_cpu(), which invokes set_task_rq(), which calls task_group()
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> several times, which calls task_subsys_state_check(), which calls the
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> rcu_dereference_check() that complained above.
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>
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||||
> However, the result returns by rcu_dereference_check() is stored into
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> the task structure:
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||||
>
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||||
> p->se.cfs_rq = task_group(p)->cfs_rq[cpu];
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> p->se.parent = task_group(p)->se[cpu];
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||||
>
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||||
> This means that the corresponding structure must have been tied down with
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||||
> a reference count or some such. If such a reference has been taken, then
|
||||
> this complaint is a false positive, and could be suppressed by putting
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> rcu_read_lock() and rcu_read_unlock() around the call to init_idle()
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> from fork_idle(). However, although, reference to the enclosing ->cgroups
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> struct css_set is held, it is not clear to me that this reference applies
|
||||
> to the structures pointed to by the ->subsys[] array, especially given
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||||
> that the cgroup_subsys_state structures referenced by this array have
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> their own reference count, which does not appear to me to be acquired
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> by this code path.
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||||
>
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||||
> Or are the cgroup_subsys_state structures referenced by idle tasks
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> never freed or some such?
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||||
|
||||
I would hope so!, the idle tasks should be part of the root cgroup,
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||||
which is not removable.
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||||
|
||||
The problem is that while we do in-fact hold rq->lock, the newly spawned
|
||||
idle thread's cpu is not yet set to the correct cpu so the lockdep check
|
||||
in task_group():
|
||||
|
||||
lockdep_is_held(&task_rq(p)->lock)
|
||||
|
||||
will fail.
|
||||
|
||||
But of a chicken and egg problem. Setting the cpu needs to have the cpu
|
||||
set ;-)
|
||||
|
||||
Ingo, why do we have rq->lock there at all? The CPU isn't up and running
|
||||
yet, nothing should be touching it.
|
||||
|
||||
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
|
||||
---
|
||||
kernel/sched.c | 12 ++++++++++++
|
||||
1 files changed, 12 insertions(+), 0 deletions(-)
|
||||
|
||||
diff --git a/kernel/sched.c b/kernel/sched.c
|
||||
index bd8b487..6241049 100644
|
||||
--- a/kernel/sched.c
|
||||
+++ b/kernel/sched.c
|
||||
@@ -5332,7 +5332,19 @@ void __cpuinit init_idle(struct task_struct *idle, int cpu)
|
||||
idle->se.exec_start = sched_clock();
|
||||
|
||||
cpumask_copy(&idle->cpus_allowed, cpumask_of(cpu));
|
||||
+ /*
|
||||
+ * We're having a chicken and egg problem, even though we are
|
||||
+ * holding rq->lock, the cpu isn't yet set to this cpu so the
|
||||
+ * lockdep check in task_group() will fail.
|
||||
+ *
|
||||
+ * Similar case to sched_fork(). / Alternatively we could
|
||||
+ * use task_rq_lock() here and obtain the other rq->lock.
|
||||
+ *
|
||||
+ * Silence PROVE_RCU
|
||||
+ */
|
||||
+ rcu_read_lock();
|
||||
__set_task_cpu(idle, cpu);
|
||||
+ rcu_read_unlock();
|
||||
|
||||
rq->curr = rq->idle = idle;
|
||||
#if defined(CONFIG_SMP) && defined(__ARCH_WANT_UNLOCKED_CTXSW)
|
||||
|
||||
--
|
||||
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
|
||||
the body of a message to majordomo@vger.kernel.org
|
||||
More majordomo info at http://vger.kernel.org/majordomo-info.html
|
||||
Please read the FAQ at http://www.tux.org/lkml/
|
||||
|
||||
|
|
@ -1636,9 +1636,9 @@ index 2de5b1c..a283086 100644
|
|||
+ kernel interface exported to kernel modules, to track events in
|
||||
+ user threads, extract and change user thread state.
|
||||
+
|
||||
menu "RCU Subsystem"
|
||||
source "kernel/irq/Kconfig"
|
||||
|
||||
choice
|
||||
menu "RCU Subsystem"
|
||||
diff --git a/kernel/Makefile b/kernel/Makefile
|
||||
index 0b72d1a..6004913 100644
|
||||
--- a/kernel/Makefile
|
||||
|
|
|
|||
Loading…
Reference in New Issue