- 07 12月, 2012 3 次提交
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由 Will Deacon 提交于
Commit b9a50f74 ("ARM: 7450/1: dcache: select DCACHE_WORD_ACCESS for little-endian ARMv6+ CPUs") added support for word-at-time path comparisons, relying on the ability to perform unaligned loads with negligible performance impact in hardware. For nommu configurations without MPU support, this is unpredictable and so we should fall back to the byte-by-byte routines. Acked-by: NNicolas Pitre <nico@linaro.org> Tested-by: NJonathan Austin <jonathan.austin@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 Will Deacon 提交于
Recent ARMv7 toolchains assume that unaligned memory accesses will not fault and will instead be handled by the processor. For the nommu case (without an MPU), memory will be treated as strongly-ordered and therefore unaligned accesses may fault regardless of the SCTLR.A setting. This patch passes -mno-unaligned-access to GCC when compiling for nommu targets, preventing the generation of unaligned memory access in the kernel. Acked-by: NNicolas Pitre <nico@linaro.org> Tested-by: NJonathan Austin <jonathan.austin@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 Armando Visconti 提交于
This patch keeps disabled the strict alignment CP15 bit for all armv6 and armv7 processor without the mmu. This behaviour is now same as in the mmu case. Signed-off-by: NArmando Visconti <armando.visconti@st.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 03 12月, 2012 1 次提交
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由 Linus Walleij 提交于
This passes the lm resource to register the AMBA devices on the LM as contained within the LM resource. Signed-off-by: NLinus Walleij <linus.walleij@linaro.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 19 11月, 2012 4 次提交
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由 Will Drewry 提交于
Reflect architectural support for seccomp filter. Signed-off-by: NWill Drewry <wad@chromium.org> Signed-off-by: NKees Cook <keescook@chromium.org> Reviewed-by: NWill Deacon <will.deacon@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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由 Kees Cook 提交于
On tracehook-friendly platforms, a system call number of -1 falls through without running much code or taking much action. ARM is different. This adds a short-circuit check in the trace path to avoid any additional work, as suggested by Russell King, to make sure that ARM behaves the same way as other platforms. Signed-off-by: NKees Cook <keescook@chromium.org> Acked-by: NWill Drewry <wad@chromium.org> Reviewed-by: NWill Deacon <will.deacon@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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由 Kees Cook 提交于
There is very little difference in the TIF_SECCOMP and TIF_SYSCALL_WORK path in entry-common.S, so merge TIF_SECCOMP into TIF_SYSCALL_WORK and move seccomp into the syscall_trace_enter() handler. Expanded some of the tracehook logic into the callers to make this code more readable. Since tracehook needs to do register changing, this portion is best left in its own function instead of copy/pasting into the callers. Additionally, the return value for secure_computing() is now checked and a -1 value will result in the system call being skipped. Signed-off-by: NKees Cook <keescook@chromium.org> Acked-by: NWill Drewry <wad@chromium.org> Reviewed-by: NWill Deacon <will.deacon@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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由 Will Drewry 提交于
Provide an ARM implementation of syscall_get_arch. This is a pre-requisite for CONFIG_HAVE_ARCH_SECCOMP_FILTER. Signed-off-by: NWill Drewry <wad@chromium.org> Signed-off-by: NKees Cook <keescook@chromium.org> Reviewed-by: NWill Deacon <will.deacon@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 13 11月, 2012 3 次提交
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由 Nicolas Pitre 提交于
Signed-off-by: NNicolas Pitre <nico@linaro.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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由 Nicolas Pitre 提交于
Flushing the cache is needed for the hardware to see the idmap table and therefore can be done at init time. On ARMv7 it is not necessary to flush L2 so flush_cache_louis() is used here instead. There is no point flushing the cache in setup_mm_for_reboot() as the caller should, and already is, taking care of this. If switching the memory map requires a cache flush, then cpu_switch_mm() already includes that operation. What is not done by cpu_switch_mm() on ASID capable CPUs is TLB flushing as the whole point of the ASID is to tag the TLBs and avoid flushing them on a context switch. Since we don't have a clean ASID for the identity mapping, we need to flush the TLB explicitly in that case. Otherwise this is already performed by cpu_switch_mm(). Signed-off-by: NNicolas Pitre <nico@linaro.org> Acked-by: NWill Deacon <will.deacon@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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由 Shawn Guo 提交于
Add function arch_send_wakeup_ipi_mask(), so that platform code can use it as an easy way to wake up cores that are in WFI. Signed-off-by: NShawn Guo <shawn.guo@linaro.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 04 11月, 2012 3 次提交
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由 Stephen Boyd 提交于
Add the ARM machine identifier to sortextable and select the config option so that we can sort the exception table at compile time. sortextable relies on a section named __ex_table existing in the vmlinux, but ARM's linker script places the exception table in the data section. Give the exception table its own section so that sortextable can find it. This allows us to skip the sorting step during boot. Cc: David Daney <david.daney@cavium.com> Signed-off-by: NStephen Boyd <sboyd@codeaurora.org> Tested-by: NWill Deacon <will.deacon@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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由 Linus Walleij 提交于
It has been brought to my knowledge that the .setup()/.stop() function pair in the SMP TWD is going to be called from atomic contexts for CPUs coming and going, and then the clk_prepare()/clk_unprepare() calls cannot be called on subsequent .setup()/.stop() iterations. This is however just the tip of an iceberg as the function pair is not designed to be reentrant at all. This change makes the SMP_TWD clock .setup()/.stop() pair reentrant by splitting the .setup() function in three parts: - One COMMON part that is executed the first time the first CPU in the TWD cluster is initialized. This will fetch the TWD clk for the cluster and prepare+enable it. If no clk is available it will calibrate the rate instead. - One part that is executed the FIRST TIME a certain CPU is brought on-line. This initializes and sets up the clock event for a certain CPU. - One part that is executed on every subsequent .setup() call. This will re-initialize the clock event. This is augmented to call the clk_enable()/clk_disable() pair properly. Cc: Shawn Guo <shawn.guo@linaro.org> Reported-by: NPeter Chen <peter.chen@freescale.com> Reviewed-by: NSantosh Shilimkar <santosh.shilimkar@ti.com> Tested-by: NShawn Guo <shawn.guo@linaro.org> Signed-off-by: NLinus Walleij <linus.walleij@linaro.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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由 Linus Walleij 提交于
A minor code refactoring saving a few lines by merging prepare() and enable() calls. Signed-off-by: NLinus Walleij <linus.walleij@linaro.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 18 10月, 2012 2 次提交
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由 fwu 提交于
1. On ARM platform, "nohlt" can be used to prevent core from idle process, returning immediately. 2. There are two interfaces, exported for other modules, named "disable_hlt" and "enable_hlt" are used to enable/disable the cpuidle mechanism by increasing/decreasing "hlt_counter". Disable_hlt and enable_hlt are paired operation, when you first call disable_hlt and then enable_hlt, the semantics are right. 3. There is no obvious constraint to prevent user(driver/module) code to prevent the case that enable_hlt is ahead of disable_hlt, which is a fatal operation on kernel state change from user, and there is no any WARNING or notification if the case happens in current kernel code. This patch aims to report BUG when the case happens, just like what the kernel do when enable_irq is ahead of disable_irq. Link: https://patchwork.kernel.org/patch/1527881/Signed-off-by: Nfwu <fwu@marvell.com> Signed-off-by: NYiLu Mao <ylmao@marvell.com> Signed-off-by: NNing Jiang <ning.jiang@marvell.com> Acked-by: Nicolas Pitre Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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由 Dave Martin 提交于
Because mov pc,<Rn> never switches instruction set when executed in Thumb code, Thumb-2 kernels will silently execute the target code after cpu_reset as Thumb code, even if the passed code pointer denotes ARM (bit 0 clear). This patch uses bx instead, ensuring the correct instruction set for the target code. Thumb code in the kernel is not supported prior to ARMv7, so other CPUs are not affected. Signed-off-by: NDave Martin <dave.martin@linaro.org> Acked-by: NWill Deacon <will.deacon@arm.com> Acked-by: NNicolas Pitre <nico@linaro.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 15 10月, 2012 1 次提交
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由 Matt Fleming 提交于
The hostprogs need access to the CONFIG_* symbols found in include/generated/autoconf.h. But commit abbf1590 ("UAPI: Partition the header include path sets and add uapi/ header directories") replaced $(LINUXINCLUDE) with $(USERINCLUDE) which doesn't contain the necessary include paths. This has the undesirable effect of breaking the EFI boot stub because the #ifdef CONFIG_EFI_STUB code in arch/x86/boot/tools/build.c is never compiled. It should also be noted that because $(USERINCLUDE) isn't exported by the top-level Makefile it's actually empty in arch/x86/boot/Makefile. Cc: H. Peter Anvin <hpa@zytor.com> Cc: Ingo Molnar <mingo@kernel.org> Acked-by: NDavid Howells <dhowells@redhat.com> Signed-off-by: NMatt Fleming <matt.fleming@intel.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 14 10月, 2012 2 次提交
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由 Russell King 提交于
The large platform selection choice should be sorted by option string so it's easy to find the platform you're looking for. Fix the few options which are out of this order. Acked-by: NTony Lindgren <tony@atomide.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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由 Russell King 提交于
As suggested by Andrew Morton: This is a pet peeve of mine. Any time there's a long list of items (header file inclusions, kconfig entries, array initalisers, etc) and someone wants to add a new item, they *always* go and stick it at the end of the list. Guys, don't do this. Either put the new item into a randomly-chosen position or, probably better, alphanumerically sort the list. lets sort all our select statements alphanumerically. This commit was created by the following perl: while (<>) { while (/\\\s*$/) { $_ .= <>; } undef %selects if /^\s*config\s+/; if (/^\s+select\s+(\w+).*/) { if (defined($selects{$1})) { if ($selects{$1} eq $_) { print STDERR "Warning: removing duplicated $1 entry\n"; } else { print STDERR "Error: $1 differently selected\n". "\tOld: $selects{$1}\n". "\tNew: $_\n"; exit 1; } } $selects{$1} = $_; next; } if (%selects and (/^\s*$/ or /^\s+help/ or /^\s+---help---/ or /^endif/ or /^endchoice/)) { foreach $k (sort (keys %selects)) { print "$selects{$k}"; } undef %selects; } print; } if (%selects) { foreach $k (sort (keys %selects)) { print "$selects{$k}"; } } It found two duplicates: Warning: removing duplicated S5P_SETUP_MIPIPHY entry Warning: removing duplicated HARDIRQS_SW_RESEND entry and they are identical duplicates, hence the shrinkage in the diffstat of two lines. We have four testers reporting success of this change (Tony, Stephen, Linus and Sekhar.) Acked-by: NJason Cooper <jason@lakedaemon.net> Acked-by: NTony Lindgren <tony@atomide.com> Acked-by: NStephen Warren <swarren@nvidia.com> Acked-by: NLinus Walleij <linus.walleij@linaro.org> Acked-by: NSekhar Nori <nsekhar@ti.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 13 10月, 2012 6 次提交
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由 Jeff Layton 提交于
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: NJeff Layton <jlayton@redhat.com> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Chris Metcalf 提交于
All the called functions expect interrupts to be enabled, and now one of them has started to warn about it, so make it correct. Signed-off-by: NChris Metcalf <cmetcalf@tilera.com>
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由 Al Viro 提交于
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Al Viro 提交于
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Al Viro 提交于
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Al Viro 提交于
* allow kernel_execve() leave the actual return to userland to caller (selected by CONFIG_GENERIC_KERNEL_EXECVE). Callers updated accordingly. * architecture that does select GENERIC_KERNEL_EXECVE in its Kconfig should have its ret_from_kernel_thread() do this: call schedule_tail call the callback left for it by copy_thread(); if it ever returns, that's because it has just done successful kernel_execve() jump to return from syscall IOW, its only difference from ret_from_fork() is that it does call the callback. * such an architecture should also get rid of ret_from_kernel_execve() and __ARCH_WANT_KERNEL_EXECVE This is the last part of infrastructure patches in that area - from that point on work on different architectures can live independently. Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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- 12 10月, 2012 10 次提交
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由 Konrad Rzeszutek Wilk 提交于
We actually do not do anything about it. Just return a default value of zero and if the kernel tries to write anything but 0 we BUG_ON. This fixes the case when an user tries to suspend the machine and it blows up in save_processor_state b/c 'read_cr8' is set to NULL and we get: kernel BUG at /home/konrad/ssd/linux/arch/x86/include/asm/paravirt.h:100! invalid opcode: 0000 [#1] SMP Pid: 2687, comm: init.late Tainted: G O 3.6.0upstream-00002-gac264ac-dirty #4 Bochs Bochs RIP: e030:[<ffffffff814d5f42>] [<ffffffff814d5f42>] save_processor_state+0x212/0x270 .. snip.. Call Trace: [<ffffffff810733bf>] do_suspend_lowlevel+0xf/0xac [<ffffffff8107330c>] ? x86_acpi_suspend_lowlevel+0x10c/0x150 [<ffffffff81342ee2>] acpi_suspend_enter+0x57/0xd5 CC: stable@vger.kernel.org Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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由 Konrad Rzeszutek Wilk 提交于
The hypervisor will trap it. However without this patch, we would crash as the .read_tscp is set to NULL. This patch fixes it and sets it to the native_read_tscp call. CC: stable@vger.kernel.org Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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由 David Howells 提交于
Signed-off-by: NDavid Howells <dhowells@redhat.com> Acked-by: NArnd Bergmann <arnd@arndb.de> Acked-by: NThomas Gleixner <tglx@linutronix.de> Acked-by: NMichael Kerrisk <mtk.manpages@gmail.com> Acked-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: NDave Jones <davej@redhat.com>
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由 Jason Wessel 提交于
When compiling without CONFIG_DEBUG_RODATA the following compiler warning is generated: arch/x86/kernel/kgdb.c: In function 'kgdb_arch_set_breakpoint': arch/x86/kernel/kgdb.c:749: warning: unused variable 'opc' The variable instantiation needs to be inside the #ifdef to make the warning go away. Reported-by: NThiago Rafael Becker <trbecker@trbecker.org> Signed-off-by: NJason Wessel <jason.wessel@windriver.com>
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由 Jason Wessel 提交于
This fault was detected using the kgdb test suite on boot and it crashes recursively due to the fact that CONFIG_KPROBES on mips adds an extra die notifier in the page fault handler. The crash signature looks like this: kgdbts:RUN bad memory access test KGDB: re-enter exception: ALL breakpoints killed Call Trace: [<807b7548>] dump_stack+0x20/0x54 [<807b7548>] dump_stack+0x20/0x54 The fix for now is to have kgdb return immediately if the fault type is DIE_PAGE_FAULT and allow the kprobe code to decide what is supposed to happen. Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: David S. Miller <davem@davemloft.net> Cc: <stable@vger.kernel.org> Signed-off-by: NJason Wessel <jason.wessel@windriver.com>
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由 Al Viro 提交于
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Al Viro 提交于
... and now the asm glue side of that. Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Al Viro 提交于
It's needed only in setup_sigcontext() and it's always reg - <constant>; no point passing it all way down through the call chain. This is just the signal.c side of that stuff; next will come the asm glue one... Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Al Viro 提交于
Turn the slow side of work_pending into C function, including all the looping. What we get out of that: * we do _not_ call get_signal_to_deliver() with IRQs disabled anymore * no need to save/restore volatiles on each pass if there turns to be more than one (unlikely, but still) * all double-restart prevention is in C now. * glue gets simpler. Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Al Viro 提交于
In case we have both NEED_RESCHED and SIGPENDING/NOTIFY_RESUME, handle the latter first. We'll get to original priorities in the next commit, but now that allows to simplify the treatment of NEED_RESCHED-only case nicely. Namely, now there no need to preserve the data for restarts across the call of schedule() in $work_resched; we can get there only if we had either returned from syscall without SIGPENDING (in which case we should've had no restart-worthy return value and want no restarts) or already got through do_notify_resume() call (in which case we want no restarts anymore). So we can just slap 0 into $19 instead of preserving it (and $20). Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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- 11 10月, 2012 5 次提交
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由 David Howells 提交于
Signed-off-by: NDavid Howells <dhowells@redhat.com> Acked-by: NArnd Bergmann <arnd@arndb.de> Acked-by: NThomas Gleixner <tglx@linutronix.de> Acked-by: NMichael Kerrisk <mtk.manpages@gmail.com> Acked-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: NDave Jones <davej@redhat.com>
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由 Catalin Marinas 提交于
This patch adds #ifdef __KERNEL__ guards around the COMPAT_* definitions to avoid exporting them to user. AArch32 user requiring the kernel headers must use those generated with ARCH=arm. Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com> Acked-by: NWill Deacon <will.deacon@arm.com>
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由 Catalin Marinas 提交于
This patch only includes asm/unistd32.h where necessary and removes its inclusion in the asm/unistd.h file. The __SYSCALL_COMPAT guard is dropped. Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com> Acked-by: NWill Deacon <will.deacon@arm.com>
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由 Catalin Marinas 提交于
This patch removes the compat __NR_* definitions from the unistd32.h file and only keeps those that are used by the AArch64 kernel with a new __NR_compat_* prefix. The additional wrapper definitions in arch/arm64/kernel/sys32.S have been removed and the actual wrapper names included in the asm/unistd32.h file. Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com> Acked-by: NWill Deacon <will.deacon@arm.com>
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由 Gong Tao 提交于
or1k_pic_mask_ack was failing to actually mask the IRQ. Signed-off-by: NGong Tao <gongtao0607@gmail.com> Signed-off-by: NJonas Bonn <jonas@southpole.se>
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