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path: root/arch/sh/kernel/process_32.c
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2012-11-28flagday: don't pass regs to copy_thread()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-11-28sh: switch to generic fork/vfork/cloneAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-22sh: convert to generic sys_execve()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-22sh: switch to generic kernel_thread()/kernel_execve()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-12vfs: define struct filename and have getname() return itJeff Layton
getname() is intended to copy pathname strings from userspace into a kernel buffer. The result is just a string in kernel space. It would however be quite helpful to be able to attach some ancillary info to the string. For instance, we could attach some audit-related info to reduce the amount of audit-related processing needed. When auditing is enabled, we could also call getname() on the string more than once and not need to recopy it from userspace. This patchset converts the getname()/putname() interfaces to return a struct instead of a string. For now, the struct just tracks the string in kernel space and the original userland pointer for it. Later, we'll add other information to the struct as it becomes convenient. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-05-23Merge branch 'x86-fpu-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull fpu state cleanups from Ingo Molnar: "This tree streamlines further aspects of FPU handling by eliminating the prepare_to_copy() complication and moving that logic to arch_dup_task_struct(). It also fixes the FPU dumps in threaded core dumps, removes and old (and now invalid) assumption plus micro-optimizes the exit path by avoiding an FPU save for dead tasks." Fixed up trivial add-add conflict in arch/sh/kernel/process.c that came in because we now do the FPU handling in arch_dup_task_struct() rather than the legacy (and now gone) prepare_to_copy(). * 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86, fpu: drop the fpu state during thread exit x86, xsave: remove thread_has_fpu() bug check in __sanitize_i387_state() coredump: ensure the fpu state is flushed for proper multi-threaded core dump fork: move the real prepare_to_copy() users to arch_dup_task_struct()
2012-05-16fork: move the real prepare_to_copy() users to arch_dup_task_struct()Suresh Siddha
Historical prepare_to_copy() is mostly a no-op, duplicated for majority of the architectures and the rest following the x86 model of flushing the extended register state like fpu there. Remove it and use the arch_dup_task_struct() instead. Suggested-by: Oleg Nesterov <oleg@redhat.com> Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Link: http://lkml.kernel.org/r/1336692811-30576-1-git-send-email-suresh.b.siddha@intel.com Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: David Howells <dhowells@redhat.com> Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Chris Zankel <chris@zankel.net> Cc: Richard Henderson <rth@twiddle.net> Cc: Russell King <linux@arm.linux.org.uk> Cc: Haavard Skinnemoen <hskinnemoen@gmail.com> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Mark Salter <msalter@redhat.com> Cc: Aurelien Jacquiot <a-jacquiot@ti.com> Cc: Mikael Starvik <starvik@axis.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: Tony Luck <tony.luck@intel.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Jonas Bonn <jonas@southpole.se> Cc: James E.J. Bottomley <jejb@parisc-linux.org> Cc: Helge Deller <deller@gmx.de> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Chen Liqin <liqin.chen@sunplusct.com> Cc: Lennox Wu <lennox.wu@gmail.com> Cc: David S. Miller <davem@davemloft.net> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2012-04-19sh: initial stack protector support.Filippo Arcidiacono
This implements basic -fstack-protector support, based on the early ARM version in c743f38013aeff58ef6252601e397b5ba281c633. The SMP case is limited to the initial canary value, while the UP case handles per-task granularity (limited to 32-bit sh until a new enough sh64 compiler manifests itself). Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com> Reviewed-by: Carmelo Amoroso <carmelo.amoroso@st.com> Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2012-03-30sh: fix up fallout from system.h disintegration.Paul Mundt
Quite a bit of fallout all over the place, nothing terribly exciting. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2012-03-28Disintegrate asm/system.h for SHDavid Howells
Disintegrate asm/system.h for SH. Signed-off-by: David Howells <dhowells@redhat.com> cc: linux-sh@vger.kernel.org
2012-01-12treewide: convert uses of ATTRIB_NORETURN to __noreturnJoe Perches
Use the more commonly used __noreturn instead of ATTRIB_NORETURN. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Joe Perches <joe@perches.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Haavard Skinnemoen <hskinnemoen@gmail.com> Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no> Cc: Tony Luck <tony.luck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Ralf Baechle <ralf@linux-mips.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Chris Metcalf <cmetcalf@tilera.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-06-14sh, exec: remove redundant set_fs(USER_DS)Mathias Krause
The address limit is already set in flush_old_exec() so those calls to set_fs(USER_DS) are redundant. Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2011-05-24sh: arch/sh/kernel/process_32.c needs linux/prefetch.h.Paul Mundt
Trivial build fix for certain configurations that don't grab linux/prefetch.h via alternate means (specifically SH-2 and SH-3 parts). Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2010-08-17Make do_execve() take a const filename pointerDavid Howells
Make do_execve() take a const filename pointer so that kernel_execve() compiles correctly on ARM: arch/arm/kernel/sys_arm.c:88: warning: passing argument 1 of 'do_execve' discards qualifiers from pointer target type This also requires the argv and envp arguments to be consted twice, once for the pointer array and once for the strings the array points to. This is because do_execve() passes a pointer to the filename (now const) to copy_strings_kernel(). A simpler alternative would be to cast the filename pointer in do_execve() when it's passed to copy_strings_kernel(). do_execve() may not change any of the strings it is passed as part of the argv or envp lists as they are some of them in .rodata, so marking these strings as const should be fine. Further kernel_execve() and sys_execve() need to be changed to match. This has been test built on x86_64, frv, arm and mips. Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Ralf Baechle <ralf@linux-mips.org> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-03-30include cleanup: Update gfp.h and slab.h includes to prepare for breaking ↵Tejun Heo
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: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-01-26sh: Mass ctrl_in/outX to __raw_read/writeX conversion.Paul Mundt
The old ctrl in/out routines are non-portable and unsuitable for cross-platform use. While drivers/sh has already been sanitized, there is still quite a lot of code that is not. This converts the arch/sh/ bits over, which permits us to flag the routines as deprecated whilst still building with -Werror for the architecture code, and to ensure that future users are not added. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2010-01-20sh: machine_ops based reboot support.Paul Mundt
This provides a machine_ops-based reboot interface loosely cloned from x86, and converts the native sh32 and sh64 cases over to it. Necessary both for tying in SMP support and also enabling platforms like SDK7786 to add support for their microcontroller-based power managers. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2010-01-13Merge branches 'sh/xstate', 'sh/hw-breakpoints' and 'sh/stable-updates'Paul Mundt
2010-01-13sh: Move over to dynamically allocated FPU context.Paul Mundt
This follows the x86 xstate changes and implements a task_xstate slab cache that is dynamically sized to match one of hard FP/soft FP/FPU-less. This also tidies up and consolidates some of the SH-2A/SH-4 FPU fragmentation. Now fpu state restorers are commonly defined, with the init_fpu()/fpu_init() mess reworked to follow the x86 convention. The fpu_init() register initialization has been replaced by xstate setup followed by writing out to hardware via the standard restore path. As init_fpu() now performs a slab allocation a secondary lighterweight restorer is also introduced for the context switch. In the future the DSP state will be rolled in here, too. More work remains for math emulation and the SH-5 FPU, which presently uses its own special (UP-only) interfaces. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2010-01-12sh: Move start_thread() out of line.Paul Mundt
start_thread() will become a bit heavier with the xstate freeing to be added in, so move it out-of-line in preparation. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2010-01-05sh: Kill off dead UBC headers.Paul Mundt
Nothing is using these now, so kill them all off. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-12-08Merge branch 'master' into sh/hw-breakpointsPaul Mundt
Conflict between FPU thread flag migration and debug thread flag addition. Conflicts: arch/sh/include/asm/thread_info.h arch/sh/include/asm/ubc.h arch/sh/kernel/process_32.c
2009-12-08sh: hw-breakpoints: Add preliminary support for SH-4A UBC.Paul Mundt
This adds preliminary support for the SH-4A UBC to the hw-breakpoints API. Presently only a single channel is implemented, and the ptrace interface still needs to be converted. This is the first step to cleaning up the long-standing UBC mess, making the UBC more generally accessible, and finally making it SMP safe. An additional abstraction will be layered on top of this as with the perf events code to permit the various CPU families to wire up support for their own specific UBCs, as many variations exist. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-11-25sh: Fix up the FPU emulation build.Paul Mundt
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-11-24sh: Minor optimisations to FPU handlingStuart Menefy
A number of small optimisations to FPU handling, in particular: - move the task USEDFPU flag from the thread_info flags field (which is accessed asynchronously to the thread) to a new status field, which is only accessed by the thread itself. This allows locking to be removed in most cases, or can be reduced to a preempt_lock(). This mimics the i386 behaviour. - move the modification of regs->sr and thread_info->status flags out of save_fpu() to __unlazy_fpu(). This gives the compiler a better chance to optimise things, as well as making save_fpu() symmetrical with restore_fpu() and init_fpu(). - implement prepare_to_copy(), so that when creating a thread, we can unlazy the FPU prior to copying the thread data structures. Also make sure that the FPU is disabled while in the kernel, in particular while booting, and for newly created kernel threads, In a very artificial benchmark, the execution time for 2500000 context switches was reduced from 50 to 45 seconds. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-11-24Merge branch 'master' into sh/st-integrationPaul Mundt
2009-11-24sh: add sleazy FPU optimizationGiuseppe CAVALLARO
sh port of the sLeAZY-fpu feature currently implemented for some architectures such us i386. Right now the SH kernel has a 100% lazy fpu behaviour. This is of course great for applications that have very sporadic or no FPU use. However for very frequent FPU users... you take an extra trap every context switch. The patch below adds a simple heuristic to this code: after 5 consecutive context switches of FPU use, the lazy behavior is disabled and the context gets restored every context switch. After 256 switches, this is reset and the 100% lazy behavior is returned. Tests with LMbench showed no regression. I saw a little improvement due to the prefetching (~2%). The tests below also show that, with this sLeazy patch, indeed, the number of FPU exceptions is reduced. To test this. I hacked the lat_ctx LMBench to use the FPU a little more. sLeasy implementation =========================================== switch_to calls | 79326 sleasy calls | 42577 do_fpu_state_restore calls| 59232 restore_fpu calls | 59032 Exceptions: 0x800 (FPU disabled ): 16604 100% Leazy (default implementation) =========================================== switch_to calls | 79690 do_fpu_state_restore calls | 53299 restore_fpu calls | 53101 Exceptions: 0x800 (FPU disabled ): 53273 Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com> Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-10-27sh: Clean up more superfluous symbol exports.Paul Mundt
Many of these symbols went away completely, or we just never cared about them in the first place. Trim the exports down to the essential set. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24sh: Use internal watchdog timer to perform resetJon Frosdick
This patches will trigger a reboot using the watchdog timer instead of double fault. Unlike the previous method, this one actually works in 32 bit mode. Reset should also be cleaner. Signed-off-by: Jon Frosdick <jon.frosdick@st.com> Signed-off-by: Carl Shaw <carl.shaw@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-07-11sh: Mark __switch_to() as __notrace_funcgraphMatt Fleming
Annotate __switch_to() so that the function graph tracer does not try to trace it. Use __notrace_funcgraph, as opposed to notrace, so that other tracers can continue to trace __switch_to(). The reason that we don't want to trace __switch_to() with the function graph tracer is because of how the return address stack in task_struct is implemented. When we enter __switch_to we store the real return address on prev's ret_stack. When we return from __switch_to() we've patched the return address on the kernel stack to be return_to_handler. Calling return_to_handler we do, -> ftrace_return_to_handler() -> ftrace_pop_return_ftrace() Which tries to pop the real return address from current->ret_stack. The problem being that we stored the return address on prev->ret_stack, but current now points to next, and next->ret_stack doesn't contain the correct return address (and is possibly even empty). Signed-off-by: Matt Fleming <matt@console-pimps.org> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-06-18Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6: (56 commits) sh: Fix declaration of __kernel_sigreturn and __kernel_rt_sigreturn sh: Enable soc-camera in ap325rxa/migor/se7724 defconfigs. sh: remove stray markers. sh: defconfig updates. sh: pci: Initial PCI-Express support for SH7786 Urquell board. sh: Generic HAVE_PERF_COUNTER support. SH: convert migor to soc-camera as platform-device SH: convert ap325rxa to soc-camera as platform-device soc-camera: unify i2c camera device platform data sh: add platform data for r8a66597-hcd in setup-sh7723 sh: add platform data for r8a66597-hcd in setup-sh7366 sh: x3proto: add platform data for r8a66597-hcd sh: highlander: add platform data for r8a66597-hcd sh: sh7785lcr: add platform data for r8a66597-hcd sh: turn off irqs when disabling CMT/TMU timers sh: use kzalloc() for cpg clocks sh: unbreak WARN_ON() sh: Use generic atomic64_t implementation. sh: Revised clock function in highlander sh: Update r7780mp defconfig ...
2009-06-18ptrace: remove PT_DTRACE from avr32, mn10300, parisc, s390, sh, xtensaOleg Nesterov
avr32, mn10300, parisc, s390, sh, xtensa: They never set PT_DTRACE, but clear it after do_execve(). Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: David Howells <dhowells@redhat.com> Acked-by: Kyle McMartin <kyle@mcmartin.ca> Cc: Grant Grundler <grundler@parisc-linux.org> Cc: Matthew Wilcox <matthew@wil.cx> Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Acked-by: Paul Mundt <lethal@linux-sh.org> Acked-by: Chris Zankel <chris@zankel.net> Acked-by: Roland McGrath <roland@redhat.com> Acked-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-18sh: remove stray markers.Christoph Hellwig
arch/sh has a couple of stray markers without any users introduced in commit 3d58695edbfac785161bf282dc11fd42a483d6c9. Remove them in preparation of removing the markers in favour of the TRACE_EVENT macro (and also because we don't keep dead code around). Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-09sh: Fix UBC setup and registers for SH2AKieran Bingham
Signed-off-by: Kieran Bingham <kieranbingham@gmail.com> Signed-off-by: Peter Griffin <pgriffin@mpc-data.co.uk> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-04-05Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6: (23 commits) sh: sh7785lcr: Map whole PCI address space. sh: Fix up DSP context save/restore. sh: Fix up number of on-chip DMA channels on SH7091. sh: update defconfigs. sh: Kill off broken direct-mapped cache mode. sh: Wire up ARCH_HAS_DEFAULT_IDLE for cpuidle. sh: Add a command line option for disabling I/O trapping. sh: Select ARCH_HIBERNATION_POSSIBLE. sh: migor: Fix up CEU use flags. input: migor_ts: add wakeup support rtc: rtc-sh: use set_irq_wake() input: sh_keysc: use enable/disable_irq_wake() sh: intc: set_irq_wake() support sh: intc: install enable, disable and shutdown callbacks clocksource: sh_cmt: use remove_irq() and remove clockevent workaround sh: ap325 and Migo-R use new sh_mobile_ceu_info flags sh: Fix up -Wformat-security whining. sh: ap325rxa: Add ov772x support, again. sh: Sanitize asm/mmu.h for assembly use. sh: Tidy up sh7786 pinmux table. ...
2009-04-04sh: Fix up DSP context save/restore.Michael Trimarchi
There were a number of issues with the DSP context save/restore code, mostly left-over relics from when it was introduced on SH3-DSP with little follow-up testing, resulting in things like task_pt_dspregs() referencing incorrect state on the stack. This follows the MIPS convention of tracking the DSP state in the thread_struct and handling the state save/restore in switch_to() and finish_arch_switch() respectively. The regset interface is also updated, which allows us to finally be rid of task_pt_dspregs() and the special cased task_pt_regs(). Signed-off-by: Michael Trimarchi <michael@evidence.eu.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-04-02Simplify copy_thread()Alexey Dobriyan
First argument unused since 2.3.11. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-12-22sh: Simplify kernel_thread_helper() for sh32.Paul Mundt
This can use the same implementation as sh64, the generated assembly is the same between the new and old version, so there is not much point in leaving it open coded in inline assembly. This is preparatory work for future consolidation of the _32/_64 variants. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-12-22sh: Split out the idle loop for reuse between _32/_64 variants.Paul Mundt
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-12-22sh: do not latency trace idle.Paul Mundt
Description snipped from Steven Rostedt's PPC patch: When idle is called, interrupts are blocked, but the idle function will still wake up on an interrupt. The problem is that the interrupt disabled latency tracer will take this call to idle as a latency. This patch disables the latency tracing when going into idle. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-12-22sh: Tidy up backtrace formatting with kallsyms disabled.Paul Mundt
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-12-22sh: Add a simple code dumper for SUPERH32 show_regs().Paul Mundt
This implements a simple show_code() that is in turn plugged in to show_regs() to provide minimal code dumping at the end of the trace. Built on top of a simple instruction disassembler derived from the binutils opcode table. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-09-21sh: Add FPU registers to regset interface.Paul Mundt
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-09-21sh: Trivial trace_mark() instrumentation for core events.Paul Mundt
This implements a few trace points across events that are deemed interesting. This implements a number of trace points: - The page fault handler / TLB miss - IPC calls - Kernel thread creation The original LTTng patch had the slow-path instrumented, which fails to account for the vast majority of events. In general placing this in the fast-path is not a huge performance hit, as we don't take page faults for kernel addresses. The other bits of interest are some of the other trap handlers, as well as the syscall entry/exit (which is better off being handled through the tracehook API). Most of the other trap handlers are corner cases where alternate means of notification exist, so there is little value in placing extra trace points in these locations. Based on top of the points provided both by the LTTng instrumentation patch as well as the patch shipping in the ST-Linux tree, albeit in a stripped down form. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-09-08sh: fixup many sparse errors.Paul Mundt
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-09-08sh: Display CPU information in show_regs().Paul Mundt
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-07-28sh/kernel/ cleanupsAdrian Bunk
This patch contains the following cleanups: - make the following needlessly global code static: - cf-enabler.c: cf_init() - cpu/clock.c: __clk_enable() - cpu/clock.c: __clk_disable() - process_32.c: default_idle() - time_32.c: struct clocksource_sh - timers/timer-tmu.c: struct tmu_timer_ops - remove the following unused functions (no CONFIG_BLK_DEV_FD on sh): - process_{32,64}.c: disable_hlt() - process_{32,64}.c: enable_hlt() Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-07-18nohz: prevent tick stop outside of the idle loopThomas Gleixner
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: eric miao <eric.y.miao@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-03-26sh: Fix occasional FPU register corruption under preempt.Paul Mundt
Presently with preempt enabled there's the possibility to be preempted after the TIF_USEDFPU test and the register save, leading to bogus state post-__switch_to(). Use an explicit preempt_disable()/enable() pair around unlazy_fpu()/clear_fpu() to avoid this. Follows the x86 change. Reported-by: Takuo Koguchi <takuo.koguchi.sw@hitachi.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-01-28sh: GUSA atomic rollback support.Stuart Menefy
This implements kernel-level atomic rollback built on top of gUSA, as an alternative non-IRQ based atomicity method. This is generally a faster method for platforms that are lacking the LL/SC pairs that SH-4A and later use, and is only supportable on legacy cores. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>