kernel.git/arch/mips/include/asm/thread_info.h, branch linux-3.18.y

MIPS: MT: Remove SMTC support

2014-05-23T22:07:01Z

Nobody is maintaining SMTC anymore and there also seems to be no userbase. Which is a pity - the SMTC technology primarily developed by Kevin D. Kissell is an ingenious demonstration for the MT ASE's power and elegance. Based on Markos Chandras patch https://patchwork.linux-mips.org/patch/6719/ which while very similar did no longer apply cleanly when I tried to merge it plus some additional post-SMTC cleanup - SMTC was a feature as tricky to remove as it was to merge once upon a time. Signed-off-by: Ralf Baechle

MIPS: Basic MSA context switching support

2014-03-26T22:09:10Z

This patch adds support for context switching the MSA vector registers. These 128 bit vector registers are aliased with the FP registers - an FP register accesses the least significant bits of the vector register with which it is aliased (ie. the register with the same index). Due to both this & the requirement that the scalar FPU must be 64-bit (FR=1) if enabled at the same time as MSA the kernel will enable MSA & scalar FP at the same time for tasks which use MSA. If we restore the MSA vector context then we might as well enable the scalar FPU since the reason it was left disabled was to allow for lazy FP context restoring - but we just restored the FP context as it's a subset of the vector context. If we restore the FP context and have previously used MSA then we have to restore the whole vector context anyway (see comment in enable_restore_fp_context for details) so similarly we might as well enable MSA. Thus if a task does not use MSA then it will continue to behave as without this patch - the scalar FP context will be saved & restored as usual. But if a task executes an MSA instruction then it will save & restore the vector context forever more. Signed-off-by: Paul Burton Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6431/ Signed-off-by: Ralf Baechle

MIPS: asm: thread_info: Add _TIF_SECCOMP flag

2014-03-26T22:09:08Z

Add _TIF_SECCOMP flag to _TIF_WORK_SYSCALL_ENTRY to indicate that the system call needs to be checked against a seccomp filter. Signed-off-by: Markos Chandras Reviewed-by: Paul Burton Reviewed-by: James Hogan Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6405/ Signed-off-by: Ralf Baechle

MIPS: Support for 64-bit FP with O32 binaries

2014-01-13T22:40:56Z

CPUs implementing MIPS32 R2 may include a 64-bit FPU, just as MIPS64 CPUs do. In order to preserve backwards compatibility a 64-bit FPU will act like a 32-bit FPU (by accessing doubles from the least significant 32 bits of an even-odd pair of FP registers) when the Status.FR bit is zero, again just like a mips64 CPU. The standard O32 ABI is defined expecting a 32-bit FPU, however recent toolchains support use of a 64-bit FPU from an O32 MIPS32 executable. When an ELF executable is built to use a 64-bit FPU a new flag (EF_MIPS_FP64) is set in the ELF header. With this patch the kernel will check the EF_MIPS_FP64 flag when executing an O32 binary, and set Status.FR accordingly. The addition of O32 64-bit FP support lessens the opportunity for optimisation in the FPU emulator, so a CONFIG_MIPS_O32_FP64_SUPPORT Kconfig option is introduced to allow this support to be disabled for those that don't require it. Inspired by an earlier patch by Leonid Yegoshin, but implemented more cleanly & correctly. Signed-off-by: Paul Burton Cc: linux-mips@linux-mips.org Cc: Paul Burton Patchwork: https://patchwork.linux-mips.org/patch/6154/ Signed-off-by: Ralf Baechle

preempt: Make PREEMPT_ACTIVE generic

2013-11-13T19:21:47Z

No point in having this bit defined by architecture. Signed-off-by: Thomas Gleixner Acked-by: Peter Zijlstra Link: http://lkml.kernel.org/r/20130917183629.090698799@linutronix.de

MIPS: ftrace: Add support for syscall tracepoints.

2013-10-29T20:25:16Z

Signed-off-by: Ralf Baechle

MIPS: Move definition of SMP processor id register to header file

2013-10-29T20:23:51Z

The definition of the CP0 register used to save the smp processor id is repicated in many files, move them all to thread_info.h. Signed-off-by: Jayachandran C Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/5708/ Signed-off-by: Ralf Baechle

MIPS: Implement HAVE_CONTEXT_TRACKING.

2013-06-10T16:02:30Z

This enables support for CONFIG_NO_HZ_FULL. Signed-off-by: Ralf Baechle

MIPS: Cleanup flags in syscall flags handlers.

2013-06-10T16:01:26Z

This will simplify further modifications. Signed-off-by: Ralf Baechle

MIPS: Use inline function to access current thread pointer.

2013-04-11T11:00:06Z

With LTE this fixes this issue: LDFINAL vmlinux.o arch/mips/built-in.o (symbol from plugin): In function `sgimc_init': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here kernel/built-in.o (symbol from plugin): In function `get_task_mm': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here mm/built-in.o (symbol from plugin): In function `iov_iter_single_seg_count': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here fs/built-in.o (symbol from plugin): In function `finish_no_open': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here ipc/built-in.o (symbol from plugin): In function `ipc_init_ids': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here security/built-in.o (symbol from plugin): In function `key_schedule_gc': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here crypto/built-in.o (symbol from plugin): In function `crypto_find_alg': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here block/built-in.o (symbol from plugin): In function `elv_rb_find': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here argv_split.o (symbol from plugin): In function `argv_free': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here dec_and_lock.o (symbol from plugin): In function `_atomic_dec_and_lock': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here extable.o (symbol from plugin): In function `sort_extable': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here flex_proportions.o (symbol from plugin): In function `fprop_global_init': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here idr.o (symbol from plugin): In function `idr_for_each': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here is_single_threaded.o (symbol from plugin): In function `current_is_single_threaded': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here kobject.o (symbol from plugin): In function `kobject_get': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here kobject_uevent.o (symbol from plugin): In function `add_uevent_var': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here plist.o (symbol from plugin): In function `plist_add': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here radix-tree.o (symbol from plugin): In function `radix_tree_lookup_slot': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here ratelimit.o (symbol from plugin): In function `___ratelimit': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here rwsem-spinlock.o (symbol from plugin): In function `__init_rwsem': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here show_mem.o (symbol from plugin): In function `show_mem': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here timerqueue.o (symbol from plugin): In function `timerqueue_iterate_next': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here vsprintf.o (symbol from plugin): In function `simple_strtoull': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here delay.o (symbol from plugin): In function `__delay': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here mips-atomic.o (symbol from plugin): In function `arch_local_irq_disable': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here uncached.o (symbol from plugin): In function `run_uncached': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here lib/built-in.o (symbol from plugin): In function `_bcd2bin': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here arch/mips/lib/built-in.o (symbol from plugin): In function `ioread8': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here drivers/built-in.o (symbol from plugin): In function `fb_notifier_call_chain': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here net/built-in.o (symbol from plugin): In function `sock_from_file': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here klist.o (symbol from plugin): In function `klist_init': (.text+0x0): multiple definition of `$28' init/built-in.o (symbol from plugin):(.text+0x0): first defined here It also makes the code a little more readable, so let's merge it. Signed-off-by: Ralf Baechle