- 05 1月, 2012 1 次提交
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由 Russell King 提交于
Remove the now empty arch_reset() from all the mach/system.h includes, and remove its callsite. Remove arm_machine_restart() as this function no longer does anything useful. For samsung platforms, remove the include of mach/system-reset.h and plat/system-reset.h from their respective mach/system.h headers as these just define their arch_reset functions. As a result, the s3c2410 and plat-samsung system-reset.h files are no longer referenced, so remove these files entirely. Acked-by: NNicolas Pitre <nico@linaro.org> Acked-by: NH Hartley Sweeten <hsweeten@visionengravers.com> Acked-by: NJamie Iles <jamie@jamieiles.com> Acked-by: NTony Lindgren <tony@atomide.com> Acked-by: NLinus Walleij <linus.walleij@linaro.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 21 11月, 2011 2 次提交
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由 Will Deacon 提交于
This patch implements a workaround for PL310 erratum 769419. On revisions of the PL310 prior to r3p2, the Store Buffer does not automatically drain. This can cause normal, non-cacheable writes to be retained when the memory system is idle, leading to suboptimal I/O performance for drivers using coherent DMA. This patch adds an optional wmb() call to the cpu_idle loop. On systems with an outer cache, this causes an explicit flush of the store buffer. Cc: stable@vger.kernel.org Acked-by: NCatalin Marinas <catalin.marinas@arm.com> Tested-by: NMarc Zyngier <marc.zyngier@arm.com> Signed-off-by: NWill Deacon <will.deacon@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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由 Russell King 提交于
We only need to set the system up for a soft-restart if we're going to be doing a soft-restart. Provide a new function (soft_restart()) which does the setup and final call for this, and make platforms use it. Eliminate the call to setup_restart() from the default handler. This means that platforms arch_reset() function is no longer called with the page tables prepared for a soft-restart, and caches will still be enabled. Acked-by: NNicolas Pitre <nico@linaro.org> Acked-by: NWill Deacon <will.deacon@arm.com> Acked-by: NH Hartley Sweeten <hsweeten@visionengravers.com> Acked-by: NKukjin Kim <kgene.kim@samsung.com> Acked-by: NSascha Hauer <s.hauer@pengutronix.de> Acked-by: NViresh Kumar <viresh.kumar@st.com> Acked-by: NKrzysztof Ha■asa <khc@pm.waw.pl> Acked-by: NPaul Mundt <lethal@linux-sh.org> Acked-by: NRichard Purdie <richard.purdie@linuxfoundation.org> Acked-by: NWan ZongShun <mcuos.com@gmail.com> Acked-by: NEric Miao <eric.y.miao@gmail.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 11 11月, 2011 2 次提交
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由 Russell King 提交于
setup_mm_for_reboot() doesn't make use of its argument, so remove it. Acked-by: NNicolas Pitre <nico@linaro.org> Acked-by: NWill Deacon <will.deacon@arm.com> Acked-by: NH Hartley Sweeten <hsweeten@visionengravers.com> Acked-by: NTony Lindgren <tony@atomide.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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由 Russell King 提交于
Move the failure to reboot into machine_restart() to always catch this condition, even if a platform decides to hook the restarting via arm_pm_restart(). Acked-by: NNicolas Pitre <nico@linaro.org> Acked-by: NWill Deacon <will.deacon@arm.com> Acked-by: NH Hartley Sweeten <hsweeten@visionengravers.com> Acked-by: NTony Lindgren <tony@atomide.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 01 11月, 2011 1 次提交
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由 Paul Gortmaker 提交于
Many of the core ARM kernel files are not modules, but just including module.h for exporting symbols. Now these files can use the lighter footprint export.h for this role. There are probably lots more, but ARM files of mach-* and plat-* don't get coverage via a simple yesconfig build. They will have to be cleaned up and tested via using their respective configs. Signed-off-by: NPaul Gortmaker <paul.gortmaker@windriver.com>
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- 17 10月, 2011 1 次提交
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由 Laura Abbott 提交于
Currently, show_regs calls __backtrace which does nothing if CONFIG_FRAME_POINTER is not set. Switch to dump_stack which handles both CONFIG_FRAME_POINTER and CONFIG_ARM_UNWIND correctly. __backtrace is now superseded by dump_stack in general and show_regs was the last caller so remove __backtrace as well. Signed-off-by: NLaura Abbott <lauraa@codeaurora.org> Acked-by: NNicolas Pitre <nicolas.pitre@linaro.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 05 8月, 2011 1 次提交
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由 David Brown 提交于
Commit a0bfa137 mispells cpuidle_idle_call() on ARM and SH code. Fix this to be consistent. Cc: Kevin Hilman <khilman@deeprootsystems.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: x86@kernel.org Cc: Len Brown <len.brown@intel.com> Signed-off-by: NDavid Brown <davidb@codeaurora.org> [ Also done by Mark Brown - th ebug has been around forever, and was noticed in -next, but the idle tree never picked it up. Bad bad bad ] Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 04 8月, 2011 1 次提交
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由 Len Brown 提交于
cpuidle users should call cpuidle_call_idle() directly rather than via (pm_idle)() function pointer. Architecture may choose to continue using (pm_idle)(), but cpuidle need not depend on it: my_arch_cpu_idle() ... if(cpuidle_call_idle()) pm_idle(); cc: Kevin Hilman <khilman@deeprootsystems.com> cc: Paul Mundt <lethal@linux-sh.org> cc: x86@kernel.org Acked-by: NH. Peter Anvin <hpa@linux.intel.com> Signed-off-by: NLen Brown <len.brown@intel.com>
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- 11 4月, 2011 1 次提交
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由 Catalin Marinas 提交于
This patch adds THREAD_NOTIFY_COPY for calling registered handlers during the copy_thread() function call. It also changes the VFP handler to use a switch statement rather than if..else and ignore this event. Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 12 1月, 2011 1 次提交
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由 Will Deacon 提交于
When running without an MMU, we do not need to install a mapping for the vectors page. Attempting to do so causes a compile-time error because install_special_mapping is not defined. This patch adds compile-time guards to the vector mapping functions so that we can build nommu configurations once more. Acked-by: NGreg Ungerer <gerg@uclinux.org> Signed-off-by: NWill Deacon <will.deacon@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 08 10月, 2010 1 次提交
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由 Kevin Hilman 提交于
In order for CPUidle to work on SMP systems, an implementation of cpu_idle_wait() is needed. This patch duplicates the x86 implementation of cpu_idle_wait() for ARM. Tested-by: NColin Cross <ccross@android.com> Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 02 10月, 2010 1 次提交
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由 Nicolas Pitre 提交于
The kernel makes the high vector page visible to user space. This page contains (amongst others) small code segments that can be executed in user space. Make this page visible through ptrace and /proc/<pid>/mem in order to let gdb perform code parsing needed for proper unwinding. For example, the ERESTART_RESTARTBLOCK handler actually has a stack frame -- it returns to a PC value stored on the user's stack. To unwind after a "sleep" system call was interrupted twice, GDB would have to recognize this situation and understand that stack frame layout -- which it currently cannot do. We could fix this by hard-coding addresses in the vector page range into GDB, but that isn't really portable as not all of those addresses are guaranteed to remain stable across kernel releases. And having the gdb process make an exception for this page and get content from its own address space for it looks strange, and it is not future proof either. Being located above PAGE_OFFSET, this vma cannot be deleted by user space code. Signed-off-by: NNicolas Pitre <nicolas.pitre@linaro.org>
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- 08 9月, 2010 1 次提交
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由 Will Deacon 提交于
For debuggers to take advantage of the hw-breakpoint framework in the kernel, it is necessary to expose the API calls via a ptrace interface. This patch exposes the hardware breakpoints framework as a collection of virtual registers, accesible using PTRACE_SETHBPREGS and PTRACE_GETHBPREGS requests. The breakpoints are stored in the debug_info struct of the running thread. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: S. Karthikeyan <informkarthik@gmail.com> Signed-off-by: NWill Deacon <will.deacon@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 27 7月, 2010 2 次提交
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由 Russell King 提交于
x86 calls machine_shutdown() from the various machine_*() calls which take the machine down ready for halting, restarting, etc, and uses this to bring the system safely to a point where those actions can be performed. Such actions are stopping the secondary CPUs. So, change the ARM implementation of these to reflect what x86 does. This solves kexec problems on ARM SMP platforms, where the secondary CPUs were left running across the kexec call. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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由 Russell King 提交于
All implementations of cpu_proc_fin() start by disabling interrupts and then flush caches. Rather than have every processors proc_fin() implementation do this, move it out into generic code - and move the cache flush past setup_mm_for_reboot() (so it can benefit from having caches still enabled.) This allows cpu_proc_fin() to become independent of the L1/L2 cache types, and eventually move the L2 cache flushing into the L2 support code. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 10 7月, 2010 1 次提交
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由 Russell King 提交于
CPU: Testing write buffer coherency: ok ------------[ cut here ]------------ WARNING: at kernel/lockdep.c:3145 check_flags+0xcc/0x1dc() Modules linked in: [<c0035120>] (unwind_backtrace+0x0/0xf8) from [<c0355374>] (dump_stack+0x20/0x24) [<c0355374>] (dump_stack+0x20/0x24) from [<c0060c04>] (warn_slowpath_common+0x58/0x70) [<c0060c04>] (warn_slowpath_common+0x58/0x70) from [<c0060c3c>] (warn_slowpath_null+0x20/0x24) [<c0060c3c>] (warn_slowpath_null+0x20/0x24) from [<c008f224>] (check_flags+0xcc/0x1dc) [<c008f224>] (check_flags+0xcc/0x1dc) from [<c00945dc>] (lock_acquire+0x50/0x140) [<c00945dc>] (lock_acquire+0x50/0x140) from [<c0358434>] (_raw_spin_lock+0x50/0x88) [<c0358434>] (_raw_spin_lock+0x50/0x88) from [<c00fd114>] (set_task_comm+0x2c/0x60) [<c00fd114>] (set_task_comm+0x2c/0x60) from [<c007e184>] (kthreadd+0x30/0x108) [<c007e184>] (kthreadd+0x30/0x108) from [<c0030104>] (kernel_thread_exit+0x0/0x8) ---[ end trace 1b75b31a2719ed1c ]--- possible reason: unannotated irqs-on. irq event stamp: 3 hardirqs last enabled at (2): [<c0059bb0>] finish_task_switch+0x48/0xb0 hardirqs last disabled at (3): [<c002f0b0>] ret_slow_syscall+0xc/0x1c softirqs last enabled at (0): [<c005f3e0>] copy_process+0x394/0xe5c softirqs last disabled at (0): [<(null)>] (null) Fix this by ensuring that the lockdep interrupt state is manipulated in the appropriate places. We essentially treat userspace as an entirely separate environment which isn't relevant to lockdep (lockdep doesn't monitor userspace.) We don't tell lockdep that IRQs will be enabled in that environment. Instead, when creating kernel threads (which is a rare event compared to entering/leaving userspace) we have to update the lockdep state. Do this by starting threads with IRQs disabled, and in the kthread helper, tell lockdep that IRQs are enabled, and enable them. This provides lockdep with a consistent view of the current IRQ state in kernel space. This also revert portions of 0d928b0b which didn't fix the problem. Tested-by: NMing Lei <tom.leiming@gmail.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 15 6月, 2010 2 次提交
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由 Nicolas Pitre 提交于
This is the very basic stuff without the changing canary upon task switch yet. Just the Kconfig option and a constant canary value initialized at boot time. Signed-off-by: NNicolas Pitre <nicolas.pitre@linaro.org>
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由 Nicolas Pitre 提交于
For this feature to take effect, CONFIG_COMPAT_BRK must be turned off. This can safely be turned off for any EABI user space versions. Signed-off-by: NNicolas Pitre <nicolas.pitre@linaro.org>
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- 21 4月, 2010 1 次提交
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由 Russell King 提交于
/tmp/ccJ3ssZW.s: Assembler messages: /tmp/ccJ3ssZW.s:1952: Error: can't resolve `.text' {.text section} - `.LFB1077' This is caused because: .section .data .section .text .section .text .previous does not return us to the .text section, but the .data section; this makes use of .previous dangerous if the ordering of previous sections is not known. Fix up the other users of .previous; .pushsection and .popsection are a safer pairing to use than .section and .previous. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 30 3月, 2010 1 次提交
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由 Tejun Heo 提交于
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: NTejun Heo <tj@kernel.org> Guess-its-ok-by: NChristoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
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- 09 1月, 2010 1 次提交
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由 Rabin Vincent 提交于
Fix the following warning, which appears when the register dump for a faulting process is printed in a kernel with SMP, DEBUG_PREEMPT, and DEBUG_USER (with user_debug=31) enabled: BUG: using smp_processor_id() in preemptible [00000000] code: init/1 caller is __show_regs+0x18/0x234 Backtrace: [<c0159e5c>] (dump_backtrace+0x0/0x114) from [<c01faf30>] (dump_stack+0x18/0x1c) r6:c781a000 r5:c0157544 r4:00000001 r3:00000000 [<c01faf18>] (dump_stack+0x0/0x1c) from [<c01e5230>] (debug_smp_processor_id+0xc4/0xf8) [<c01e516c>] (debug_smp_processor_id+0x0/0xf8) from [<c0157544>] (__show_regs+0x18/0x234) r6:c781bfb0 r5:00000000 r4:c781bfb0 r3:00000000 [<c015752c>] (__show_regs+0x0/0x234) from [<c01577a0>] (show_regs+0x40/0x50) [<c0157760>] (show_regs+0x0/0x50) from [<c015c968>] (__do_user_fault+0x5c/0xa4) r4:c781c000 r3:00000000 [<c015c90c>] (__do_user_fault+0x0/0xa4) from [<c015cbe0>] (do_page_fault+0x1b4/0x1e4) r7:00000000 r6:00010000 r5:c781bfb0 r4:c781c000 [<c015ca2c>] (do_page_fault+0x0/0x1e4) from [<c01554c8>] (do_DataAbort+0x3c/0xa0) [<c015548c>] (do_DataAbort+0x0/0xa0) from [<c01560c4>] (ret_from_exception+0x0/0x10) Signed-off-by: NRabin Vincent <rabin@rab.in> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 18 12月, 2009 1 次提交
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由 Russell King 提交于
This avoids races in the VFP code where the dead thread may have state on another CPU. By moving this code to exit_thread(), we will be running as the thread, and therefore be running on the current CPU. This means that we can ensure that the only local state is accessed in the thread notifiers. Acked-by: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 14 10月, 2009 1 次提交
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由 Artem Bityutskiy 提交于
Defines ELF_CORE_COPY_TASK_REGS so that CPU register information of every thread is included in coredump. Without this, only the faulting thread is coredumped. Cc: Roger Quadros <ext-roger.quadros@nokia.com> Cc: linux-arm-kernel@lists.infradead.org Signed-off-by: NMika Westerberg <mika.westerberg@iki.fi> Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 24 7月, 2009 1 次提交
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由 Catalin Marinas 提交于
This patch implements the ARM/Thumb-2 unified kernel start-up and exception handling code. Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
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- 23 6月, 2009 1 次提交
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由 Russell King 提交于
pm_idle is used by infrastructure (eg, cpuidle) which expects architectures to call it in a certain way. Arrange for ARM to follow x86's lead on this and call pm_idle() with interrupts already disabled. However, we expect pm_idle() to enable interrupts before it returns. Also, OMAP wants to be able to disable hlt-ing, so allow hlt_counter to prevent all calls to pm_idle. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 19 6月, 2009 1 次提交
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由 Catalin Marinas 提交于
When a kthread function returns, it branches to do_exit(). However, the unwinding information isn't valid anymore and any stack trace caused by do_exit() may be incorrect. This patch adds a kernel_thread_exit() function and annotated with '.cantunwind' so that the unwinder stops when reaching it. Tested-by: NTony Lindgren <tony@atomide.com> Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 30 5月, 2009 1 次提交
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由 Catalin Marinas 提交于
Starting with ARMv6, the CPUs support the BE-8 variant of big-endian (byte-invariant). This patch adds the core support: - setting of the BE-8 mode via the CPSR.E register for both kernel and user threads - big-endian page table walking - REV used to rotate instructions read from memory during fault processing as they are still little-endian format - Kconfig and Makefile support for BE-8. The --be8 option must be passed to the final linking stage to convert the instructions to little-endian Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
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- 03 4月, 2009 1 次提交
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由 Alexey Dobriyan 提交于
First argument unused since 2.3.11. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: NAlexey Dobriyan <adobriyan@gmail.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 20 3月, 2009 1 次提交
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由 Russell King 提交于
OMAP wishes to pass state to the boot loader upon reboot in order to instruct it whether to wait for USB-based reflashing or not. There is already a facility to do this via the reboot() syscall, except we ignore the string passed to machine_restart(). This patch fixes things to pass this string to arch_reset(). This means that we keep the reboot mode limited to telling the kernel _how_ to perform the reboot which should be independent of what we request the boot loader to do. Acked-by: NTony Lindgren <tony@atomide.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 12 2月, 2009 1 次提交
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由 Catalin Marinas 提交于
This patch changes the walk_stacktrace and its callers for easier integration of stack unwinding. The arch/arm/kernel/stacktrace.h file is also moved to arch/arm/include/asm/stacktrace.h. Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 06 9月, 2008 2 次提交
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由 Russell King 提交于
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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由 Russell King 提交于
pc_pointer() was a function to mask the PC for 26-bit ARMs, which we no longer support. Remove it. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 05 9月, 2008 1 次提交
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由 Russell King 提交于
arch/arm/kernel/process.c:270:6: warning: symbol 'show_fpregs' was not declared. Should it be static? This function isn't used, so can be removed. arch/arm/kernel/setup.c:532:9: warning: symbol 'len' shadows an earlier one arch/arm/kernel/setup.c:524:6: originally declared here A function containing two 'len's. arch/arm/mm/fault-armv.c:188:13: warning: symbol 'check_writebuffer_bugs' was not declared. Should it be static? arch/arm/mm/mmap.c:122:5: warning: symbol 'valid_phys_addr_range' was not declared. Should it be static? arch/arm/mm/mmap.c:137:5: warning: symbol 'valid_mmap_phys_addr_range' was not declared. Should it be static? Missing includes. arch/arm/kernel/traps.c:71:77: warning: Using plain integer as NULL pointer arch/arm/mm/ioremap.c:355:46: error: incompatible types in comparison expression (different address spaces) Sillies. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 07 8月, 2008 1 次提交
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由 Russell King 提交于
This just leaves include/asm-arm/plat-* to deal with. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 19 7月, 2008 1 次提交
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由 Thomas Gleixner 提交于
Jack Ren and Eric Miao tracked down the following long standing problem in the NOHZ code: scheduler switch to idle task enable interrupts Window starts here ----> interrupt happens (does not set NEED_RESCHED) irq_exit() stops the tick ----> interrupt happens (does set NEED_RESCHED) return from schedule() cpu_idle(): preempt_disable(); Window ends here The interrupts can happen at any point inside the race window. The first interrupt stops the tick, the second one causes the scheduler to rerun and switch away from idle again and we end up with the tick disabled. The fact that it needs two interrupts where the first one does not set NEED_RESCHED and the second one does made the bug obscure and extremly hard to reproduce and analyse. Kudos to Jack and Eric. Solution: Limit the NOHZ functionality to the idle loop to make sure that we can not run into such a situation ever again. cpu_idle() { preempt_disable(); while(1) { tick_nohz_stop_sched_tick(1); <- tell NOHZ code that we are in the idle loop while (!need_resched()) halt(); tick_nohz_restart_sched_tick(); <- disables NOHZ mode preempt_enable_no_resched(); schedule(); preempt_disable(); } } In hindsight we should have done this forever, but ... /me grabs a large brown paperbag. Debugged-by: Jack Ren <jack.ren@marvell.com>, Debugged-by: Neric miao <eric.y.miao@gmail.com> Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
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- 13 5月, 2008 1 次提交
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由 Russell King 提交于
dyntick is superseded by the clocksource/clockevent infrastructure, using the NO_HZ configuration option. No one implements dyntick on ARM anymore, so it's pointless keeping it around. Remove dyntick support. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 09 2月, 2008 2 次提交
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由 David Howells 提交于
Remove now unnecessary inclusions of {asm,linux}/a.out.h. [akpm@linux-foundation.org: fix alpha build] Signed-off-by: NDavid Howells <dhowells@redhat.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 David Howells 提交于
Suppress A.OUT library support if CONFIG_ARCH_SUPPORTS_AOUT is not set. Not all architectures support the A.OUT binfmt, so the ELF binfmt should not be permitted to go looking for A.OUT libraries to load in such a case. Not only that, but under such conditions A.OUT core dumps are not produced either. To make this work, this patch also does the following: (1) Makes the existence of the contents of linux/a.out.h contingent on CONFIG_ARCH_SUPPORTS_AOUT. (2) Renames dump_thread() to aout_dump_thread() as it's only called by A.OUT core dumping code. (3) Moves aout_dump_thread() into asm/a.out-core.h and makes it inline. This is then included only where needed. This means that this bit of arch code will be stored in the appropriate A.OUT binfmt module rather than the core kernel. (4) Drops A.OUT support for Blackfin (according to Mike Frysinger it's not needed) and FRV. This patch depends on the previous patch to move STACK_TOP[_MAX] out of asm/a.out.h and into asm/processor.h as they're required whether or not A.OUT format is available. [jdike@addtoit.com: uml: re-remove accidentally restored code] Signed-off-by: NDavid Howells <dhowells@redhat.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: NJeff Dike <jdike@linux.intel.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 20 10月, 2007 1 次提交
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由 Alexey Dobriyan 提交于
One of the easiest things to isolate is the pid printed in kernel log. There was a patch, that made this for arch-independent code, this one makes so for arch/xxx files. It took some time to cross-compile it, but hopefully these are all the printks in arch code. Signed-off-by: NAlexey Dobriyan <adobriyan@openvz.org> Signed-off-by: NPavel Emelyanov <xemul@openvz.org> Cc: <linux-arch@vger.kernel.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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