- 11 4月, 2012 1 次提交
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由 Martin Schwidefsky 提交于
Git commit 36409f63 "use generic RCU page-table freeing code" introduced a tlb flushing bug. Partially revert the above git commit and go back to s390 specific page table flush code. For s390 the TLB can contain three types of entries, "normal" TLB page-table entries, TLB combined region-and-segment-table (CRST) entries and real-space entries. Linux does not use real-space entries which leaves normal TLB entries and CRST entries. The CRST entries are intermediate steps in the page-table translation called translation paths. For example a 4K page access in a three-level page table setup will create two CRST TLB entries and one page-table TLB entry. The advantage of that approach is that a page access next to the previous one can reuse the CRST entries and needs just a single read from memory to create the page-table TLB entry. The disadvantage is that the TLB flushing rules are more complicated, before any page-table may be freed the TLB needs to be flushed. In short: the generic RCU page-table freeing code is incorrect for the CRST entries, in particular the check for mm_users < 2 is troublesome. This is applicable to 3.0+ kernels. Cc: <stable@vger.kernel.org> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 23 3月, 2012 1 次提交
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由 Martin Schwidefsky 提交于
A kernel compiled with SMP=n will not register any cpu devices. The resulting kernel image will not boot with this error message: kernel BUG at fs/sysfs/group.c:65! Use GENERIC_CPU_DEVICES=y if SMP=n to get the missing cpu device. Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 16 3月, 2012 1 次提交
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由 Chris Metcalf 提交于
When using the "compat" APIs, architectures will generally want to be able to make direct syscalls to msgsnd(), shmctl(), etc., and in the kernel we would want them to be handled directly by compat_sys_xxx() functions, as is true for other compat syscalls. However, for historical reasons, several of the existing compat IPC syscalls do not do this. semctl() expects a pointer to the fourth argument, instead of the fourth argument itself. msgsnd(), msgrcv() and shmat() expect arguments in different order. This change adds an ARCH_WANT_OLD_COMPAT_IPC config option that can be set to preserve this behavior for ports that use it (x86, sparc, powerpc, s390, and mips). No actual semantics are changed for those architectures, and there is only a minimal amount of code refactoring in ipc/compat.c. Newer architectures like tile (and perhaps future architectures such as arm64 and unicore64) should not select this option, and thus can avoid having any IPC-specific code at all in their architecture-specific compat layer. In the same vein, if this option is not selected, IPC_64 mode is assumed, since that's what the <asm-generic> headers expect. The workaround code in "tile" for msgsnd() and msgrcv() is removed with this change; it also fixes the bug that shmat() and semctl() were not being properly handled. Reviewed-by: NArnd Bergmann <arnd@arndb.de> Signed-off-by: NChris Metcalf <cmetcalf@tilera.com>
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- 25 2月, 2012 1 次提交
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由 David Howells 提交于
Enable the compat keyctl wrapper on s390x so that 32-bit s390 userspace can call the keyctl() syscall. There's an s390x assembly wrapper that truncates all the register values to 32-bits and this then calls compat_sys_keyctl() - but the latter only exists if CONFIG_KEYS_COMPAT is enabled, and the s390 Kconfig doesn't enable it. Without this patch, 32-bit calls to the keyctl() syscall are given an ENOSYS error: [root@devel4 ~]# keyctl show Session Keyring -3: key inaccessible (Function not implemented) Signed-off-by: NDavid Howells <dhowells@redhat.com> Acked-by: dan@danny.cz Cc: Carsten Otte <cotte@de.ibm.com> Reviewed-by: NChristian Borntraeger <borntraeger@de.ibm.com> Cc: linux-s390@vger.kernel.org Cc: stable@vger.kernel.org Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 27 12月, 2011 1 次提交
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由 Heiko Carstens 提交于
Remove all ifdefs from topology code and also only compile it for the CONFIG_SCHED_BOOK case. The new code selects SCHED_MC if SCHED_BOOK is selected. SCHED_MC without SCHED_BOOK is not possible anymore. Furthermore various sysfs attributes are not available anymore for the !SCHED_BOOK case. In particular all attributes that correspond to CPU polarization. But since all real world kernels have SCHED_BOOK selected anyway this doesn't matter too much. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 09 12月, 2011 2 次提交
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由 Tejun Heo 提交于
Now all ARCH_POPULATES_NODE_MAP archs select HAVE_MEBLOCK_NODE_MAP - there's no user of early_node_map[] left. Kill early_node_map[] and replace ARCH_POPULATES_NODE_MAP with HAVE_MEMBLOCK_NODE_MAP. Also, relocate for_each_mem_pfn_range() and helper from mm.h to memblock.h as page_alloc.c would no longer host an alternative implementation. This change is ultimately one to one mapping and shouldn't cause any observable difference; however, after the recent changes, there are some functions which now would fit memblock.c better than page_alloc.c and dependency on HAVE_MEMBLOCK_NODE_MAP instead of HAVE_MEMBLOCK doesn't make much sense on some of them. Further cleanups for functions inside HAVE_MEMBLOCK_NODE_MAP in mm.h would be nice. -v2: Fix compile bug introduced by mis-spelling CONFIG_HAVE_MEMBLOCK_NODE_MAP to CONFIG_MEMBLOCK_HAVE_NODE_MAP in mmzone.h. Reported by Stephen Rothwell. Signed-off-by: NTejun Heo <tj@kernel.org> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Tony Luck <tony.luck@intel.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Chen Liqin <liqin.chen@sunplusct.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: "H. Peter Anvin" <hpa@zytor.com>
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由 Tejun Heo 提交于
s390 used early_node_map[] just to prime free_area_init_nodes(). Now memblock can be used for the same purpose and early_node_map[] is scheduled to be dropped. Use memblock instead. Signed-off-by: NTejun Heo <tj@kernel.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: linux-s390@vger.kernel.org
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- 14 11月, 2011 2 次提交
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由 Michael Holzheu 提交于
The kdump infrastructure is built on top of kexec. Therefore CONFIG_KEXEC has to be enabled when CONFIG_CRASH_DUMP is selected. Signed-off-by: NMichael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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由 Paul Bolle 提交于
There is no Kconfig symbol named HAVE_GET_USER_PAGES_FAST. The select statement for that symbol is a nop. Drop it. Signed-off-by: NPaul Bolle <pebolle@tiscali.nl> Signed-off-by: NJiri Kosina <jkosina@suse.cz>
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- 30 10月, 2011 1 次提交
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由 Michael Holzheu 提交于
This patch provides the architecture specific part of the s390 kdump support. Signed-off-by: NMichael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 17 10月, 2011 1 次提交
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由 Martin Schwidefsky 提交于
For s390 there is one additional byte associated with each page, the storage key. This byte contains the referenced and changed bits and needs to be included into the hibernation image. If the storage keys are not restored to their previous state all original pages would appear to be dirty. This can cause inconsistencies e.g. with read-only filesystems. Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>
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- 03 8月, 2011 2 次提交
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由 Huang Ying 提交于
cmpxchg() is widely used by lockless code, including NMI-safe lockless code. But on some architectures, the cmpxchg() implementation is not NMI-safe, on these architectures the lockless code may need a spin_trylock_irqsave() based implementation. This patch adds a Kconfig option: ARCH_HAVE_NMI_SAFE_CMPXCHG, so that NMI-safe lockless code can depend on it or provide different implementation according to it. On many architectures, cmpxchg is only NMI-safe for several specific operand sizes. So, ARCH_HAVE_NMI_SAFE_CMPXCHG define in this patch only guarantees cmpxchg is NMI-safe for sizeof(unsigned long). Signed-off-by: NHuang Ying <ying.huang@intel.com> Acked-by: NMike Frysinger <vapier@gentoo.org> Acked-by: NPaul Mundt <lethal@linux-sh.org> Acked-by: NHans-Christian Egtvedt <hans-christian.egtvedt@atmel.com> Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: NChris Metcalf <cmetcalf@tilera.com> Acked-by: NRichard Henderson <rth@twiddle.net> CC: Mikael Starvik <starvik@axis.com> Acked-by: NDavid Howells <dhowells@redhat.com> CC: Yoshinori Sato <ysato@users.sourceforge.jp> CC: Tony Luck <tony.luck@intel.com> CC: Hirokazu Takata <takata@linux-m32r.org> CC: Geert Uytterhoeven <geert@linux-m68k.org> CC: Michal Simek <monstr@monstr.eu> Acked-by: NRalf Baechle <ralf@linux-mips.org> CC: Kyle McMartin <kyle@mcmartin.ca> CC: Martin Schwidefsky <schwidefsky@de.ibm.com> CC: Chen Liqin <liqin.chen@sunplusct.com> CC: "David S. Miller" <davem@davemloft.net> CC: Ingo Molnar <mingo@redhat.com> CC: Chris Zankel <chris@zankel.net> Signed-off-by: NLen Brown <len.brown@intel.com>
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由 Heiko Carstens 提交于
Just fix up the Kconfig description and the elf platform. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
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- 22 6月, 2011 1 次提交
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由 Christian Borntraeger 提交于
A user can create the Kconfig combination !VIRTUALIZATION, S390_GUEST which results in the following warnings: warning: (S390_GUEST) selects VIRTIO which has unmet direct dependencies (VIRTUALIZATION) warning: (S390_GUEST && VIRTIO_PCI && VIRTIO_BALLOON) selects VIRTIO_RING which has unmet direct dependencies (VIRTUALIZATION && VIRTIO) warning: (S390_GUEST) selects VIRTIO which has unmet direct dependencies (VIRTUALIZATION) warning: (S390_GUEST && VIRTIO_PCI && VIRTIO_BALLOON) selects VIRTIO_RING which has unmet direct dependencies (VIRTUALIZATION && VIRTIO) S390_GUEST has to select VIRTUALIZATION before selecting VIRTIO and friends. Reported-by: NJan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 06 6月, 2011 1 次提交
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由 Martin Schwidefsky 提交于
Replace the s390 specific rcu page-table freeing code with the generic variant. This requires to duplicate the definition for the struct mmu_table_batch as s390 does not use the generic tlb flush code. While we are at it remove the restriction that page table fragments can not be reused after a single fragment has been freed with rcu and split out allocation and freeing of page tables with pgstes. Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 26 5月, 2011 1 次提交
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由 Heiko Carstens 提交于
Add ZONE_DMA to 31-bit config again. The performance gain is minimal and hardly anybody cares anymore about a 31-bit kernel. So add ZONE_DMA again to help with SLAB_CACHE_DMA removal for !CONFIG_ZONE_DMA configurations. Acked-by: NDavid Rientjes <rientjes@google.com> Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
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- 23 5月, 2011 1 次提交
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由 Martin Schwidefsky 提交于
The noexec support on s390 does not rely on a bit in the page table entry but utilizes the secondary space mode to distinguish between memory accesses for instructions vs. data. The noexec code relies on the assumption that the cpu will always use the secondary space page table for data accesses while it is running in the secondary space mode. Up to the z9-109 class machines this has been the case. Unfortunately this is not true anymore with z10 and later machines. The load-relative-long instructions lrl, lgrl and lgfrl access the memory operand using the same addressing-space mode that has been used to fetch the instruction. This breaks the noexec mode for all user space binaries compiled with march=z10 or later. The only option is to remove the current noexec support. Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 05 4月, 2011 1 次提交
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由 Jan Glauber 提交于
Implement the architecture backend for jump label support on s390. For a shared kernel booted from a NSS silently disable jump labels because the NSS is read-only. Therefore jump labels will be disabled in a shared kernel and can't be activated. Signed-off-by: NJan Glauber <jang@linux.vnet.ibm.com> LKML-Reference: <6935d2c41ce111e1719176ed4bbd3dbe4de80855.1300299760.git.jbaron@redhat.com> Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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- 16 3月, 2011 3 次提交
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由 Robert Richter 提交于
Remove unused HAVE_HWSAMPLER config option. It is not used anymore, removing it. Also make some functions static and some coding style fixes. Signed-off-by: NRobert Richter <robert.richter@amd.com>
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由 Heiko Carstens 提交于
Add support for XZ compressed kernel. Same as on x86 and sh. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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由 Jan Glauber 提交于
Newer gcc versions offer an architecture-independent option to check the stack size and warn if it reaches a certain limit. This option already existed for s390 by using -mwarn-dynamicstack. Since one stack check option is enough remove the s390 specific stack check but keep the option that warns about dynamic stack usage because that is not covered by the generic option. Signed-off-by: NJan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 15 2月, 2011 1 次提交
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由 Heinz Graalfs 提交于
This adds support for hardware based sampling on System z processors (models z10 and up). System z's hardware sampling is described in detail in: SA23-2260-01 "The Load-Program-Parameter and CPU-Measurement Facilities" The patch introduces - support for System z's hardware sampler in OProfile's kernel module - it adds functions that control all hardware sampling related operations as: - checking if hardware sampling feature is available, i.e.: on System z models z10 and up, in LPAR mode only, and authorised during LPAR activation - allocating memory for the hardware sampling feature - starting/stopping hardware sampling All functions required to start and stop hardware sampling have to be invoked by the oprofile kernel module as provided by the other patches of this patch set. In case hardware based sampling cannot be setup standard timer based sampling is used by OProfile. Applied with following changes: * enable compilation in Makefile Signed-off-by: NMahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Signed-off-by: NMaran Pakkirisamy <maranp@linux.vnet.ibm.com> Signed-off-by: NHeinz Graalfs <graalfs@linux.vnet.ibm.com> Acked-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NRobert Richter <robert.richter@amd.com>
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- 31 1月, 2011 1 次提交
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由 Sebastian Ott 提交于
6f9a3c33 "[S390] cleanup s390 Kconfig" accidentally changed the default for CONFIG_CHSC_SCH. Reset it to m. Signed-off-by: NSebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 05 1月, 2011 3 次提交
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由 Gerald Schaefer 提交于
This enables the spinning mutex feature on s390 by removing HAVE_DEFAULT_NO_SPIN_MUTEXES from arch/s390/Kconfig. Signed-off-by: NGerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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由 Gerald Schaefer 提交于
The spinning mutex implementation uses cpu_relax() in busy loops as a compiler barrier. Depending on the architecture, cpu_relax() may do more than needed in this specific mutex spin loops. On System z we also give up the time slice of the virtual cpu in cpu_relax(), which prevents effective spinning on the mutex. This patch replaces cpu_relax() in the spinning mutex code with arch_mutex_cpu_relax(), which can be defined by each architecture that selects HAVE_ARCH_MUTEX_CPU_RELAX. The default is still cpu_relax(), so this patch should not affect other architectures than System z for now. Signed-off-by: NGerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1290437256.7455.4.camel@thinkpad> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Martin Schwidefsky 提交于
Make use of def_bool and def_tristate where possible and add sensible defaults to the config symbols where applicable. This shortens the defconfig file by another ~40 lines. Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 26 11月, 2010 1 次提交
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由 Gerald Schaefer 提交于
The spinning mutex implementation uses cpu_relax() in busy loops as a compiler barrier. Depending on the architecture, cpu_relax() may do more than needed in this specific mutex spin loops. On System z we also give up the time slice of the virtual cpu in cpu_relax(), which prevents effective spinning on the mutex. This patch replaces cpu_relax() in the spinning mutex code with arch_mutex_cpu_relax(), which can be defined by each architecture that selects HAVE_ARCH_MUTEX_CPU_RELAX. The default is still cpu_relax(), so this patch should not affect other architectures than System z for now. Signed-off-by: NGerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1290437256.7455.4.camel@thinkpad> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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- 29 10月, 2010 3 次提交
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由 Heiko Carstens 提交于
Select HAVE_C_RECORDMCOUNT for the fast C version of recordmcount. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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由 Heiko Carstens 提交于
This allows us to easily check for performance differences seen with !CONFIG_SCHED_MC and topology=off. Actually there shouldn't be any (besides a small overhead because of additional code). Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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由 Heiko Carstens 提交于
Add machine type number to code generation options. Also clean up and shorten quite a lot of help texts with respect to machine type and architecture terminology. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 25 10月, 2010 3 次提交
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由 FUJITA Tomonori 提交于
Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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由 Heiko Carstens 提交于
Add a kernel config option for the IBM zEnterprise 196. This will produce faster code on newer compilers using the -march=z196 option. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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由 Martin Schwidefsky 提交于
Implement get_user_pages_fast without locking in the fastpath on s390. Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 19 10月, 2010 1 次提交
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由 Peter Zijlstra 提交于
Provide a mechanism that allows running code in IRQ context. It is most useful for NMI code that needs to interact with the rest of the system -- like wakeup a task to drain buffers. Perf currently has such a mechanism, so extract that and provide it as a generic feature, independent of perf so that others may also benefit. The IRQ context callback is generated through self-IPIs where possible, or on architectures like powerpc the decrementer (the built-in timer facility) is set to generate an interrupt immediately. Architectures that don't have anything like this get to do with a callback from the timer tick. These architectures can call irq_work_run() at the tail of any IRQ handlers that might enqueue such work (like the perf IRQ handler) to avoid undue latencies in processing the work. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: NKyle McMartin <kyle@mcmartin.ca> Acked-by: NMartin Schwidefsky <schwidefsky@de.ibm.com> [ various fixes ] Signed-off-by: NHuang Ying <ying.huang@intel.com> LKML-Reference: <1287036094.7768.291.camel@yhuang-dev> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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- 20 9月, 2010 1 次提交
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由 Arnaud Lacombe 提交于
Signed-off-by: NArnaud Lacombe <lacombar@gmail.com> Reviewed-by: NSam Ravnborg <sam@ravnborg.org> Reviewed-by: NMichal Marek <mmarek@suse.cz>
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- 10 9月, 2010 1 次提交
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由 Heiko Carstens 提交于
Use the extended cpu topology information that z11 machines provide to improve the scheduler's decision making. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <20100831082844.604956770@de.ibm.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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- 27 7月, 2010 1 次提交
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由 John Stultz 提交于
Now that all arches have been converted over to use generic time via clocksources or arch_gettimeoffset(), we can remove the GENERIC_TIME config option and simplify the generic code. Signed-off-by: NJohn Stultz <johnstul@us.ibm.com> LKML-Reference: <1279068988-21864-4-git-send-email-johnstul@us.ibm.com> Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
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- 27 5月, 2010 2 次提交
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由 Heiko Carstens 提交于
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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由 Heiko Carstens 提交于
All distros have this option switched on, so lets get rid of at least one of the tons of config options that are available. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 17 5月, 2010 1 次提交
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由 Heiko Carstens 提交于
The exception-trace facility on x86 and other architectures prints traces to dmesg whenever a user space application crashes. s390 has such a feature since ages however it is called userprocess_debug and is enabled differently. This patch makes sure that whenever one of the two procfs files /proc/sys/kernel/userprocess_debug /proc/sys/debug/exception-trace is modified the contents of the second one changes as well. That way we keep backwards compatibilty but also support the same interface like other architectures do. Besides that the output of the traces is improved since it will now also contain the corresponding filename of the vma (when available) where the process caused a fault or trap. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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