In order to prepare to per-arch implementations of preempt_count move the required bits into an asm-generic header and use this for all archs. Signed-off-by: Peter Zijlstra --- arch/alpha/include/asm/Kbuild | 1 arch/arc/include/asm/Kbuild | 1 arch/arm/include/asm/Kbuild | 1 arch/arm64/include/asm/Kbuild | 1 arch/avr32/include/asm/Kbuild | 1 arch/blackfin/include/asm/Kbuild | 1 arch/c6x/include/asm/Kbuild | 1 arch/cris/include/asm/Kbuild | 1 arch/frv/include/asm/Kbuild | 1 arch/h8300/include/asm/Kbuild | 1 arch/hexagon/include/asm/Kbuild | 1 arch/ia64/include/asm/Kbuild | 1 arch/m32r/include/asm/Kbuild | 1 arch/m68k/include/asm/Kbuild | 1 arch/metag/include/asm/Kbuild | 1 arch/microblaze/include/asm/Kbuild | 1 arch/mips/include/asm/Kbuild | 1 arch/mn10300/include/asm/Kbuild | 1 arch/openrisc/include/asm/Kbuild | 1 arch/parisc/include/asm/Kbuild | 1 arch/powerpc/include/asm/Kbuild | 1 arch/s390/include/asm/Kbuild | 1 arch/score/include/asm/Kbuild | 1 arch/sh/include/asm/Kbuild | 1 arch/sparc/include/asm/Kbuild | 1 arch/tile/include/asm/Kbuild | 1 arch/um/include/asm/Kbuild | 1 arch/unicore32/include/asm/Kbuild | 1 arch/x86/include/asm/Kbuild | 1 arch/xtensa/include/asm/Kbuild | 1 include/asm-generic/preempt.h | 44 +++++++++++++++++++++++++++++++++++++ include/linux/preempt.h | 39 -------------------------------- 32 files changed, 75 insertions(+), 38 deletions(-) --- a/arch/alpha/include/asm/Kbuild +++ b/arch/alpha/include/asm/Kbuild @@ -3,3 +3,4 @@ generic-y += clkdev.h generic-y += exec.h generic-y += trace_clock.h +generic-y += preempt.h --- a/arch/arc/include/asm/Kbuild +++ b/arch/arc/include/asm/Kbuild @@ -46,3 +46,4 @@ generic-y += ucontext.h generic-y += user.h generic-y += vga.h generic-y += xor.h +generic-y += preempt.h --- a/arch/arm/include/asm/Kbuild +++ b/arch/arm/include/asm/Kbuild @@ -33,3 +33,4 @@ generic-y += timex.h generic-y += trace_clock.h generic-y += types.h generic-y += unaligned.h +generic-y += preempt.h --- a/arch/arm64/include/asm/Kbuild +++ b/arch/arm64/include/asm/Kbuild @@ -50,3 +50,4 @@ generic-y += unaligned.h generic-y += user.h generic-y += vga.h generic-y += xor.h +generic-y += preempt.h --- a/arch/avr32/include/asm/Kbuild +++ b/arch/avr32/include/asm/Kbuild @@ -3,3 +3,4 @@ generic-y += clkdev.h generic-y += exec.h generic-y += trace_clock.h generic-y += param.h +generic-y += preempt.h --- a/arch/blackfin/include/asm/Kbuild +++ b/arch/blackfin/include/asm/Kbuild @@ -44,3 +44,4 @@ generic-y += ucontext.h generic-y += unaligned.h generic-y += user.h generic-y += xor.h +generic-y += preempt.h --- a/arch/c6x/include/asm/Kbuild +++ b/arch/c6x/include/asm/Kbuild @@ -56,3 +56,4 @@ generic-y += ucontext.h generic-y += user.h generic-y += vga.h generic-y += xor.h +generic-y += preempt.h --- a/arch/cris/include/asm/Kbuild +++ b/arch/cris/include/asm/Kbuild @@ -11,3 +11,4 @@ generic-y += module.h generic-y += trace_clock.h generic-y += vga.h generic-y += xor.h +generic-y += preempt.h --- a/arch/frv/include/asm/Kbuild +++ b/arch/frv/include/asm/Kbuild @@ -2,3 +2,4 @@ generic-y += clkdev.h generic-y += exec.h generic-y += trace_clock.h +generic-y += preempt.h --- a/arch/h8300/include/asm/Kbuild +++ b/arch/h8300/include/asm/Kbuild @@ -6,3 +6,4 @@ generic-y += mmu.h generic-y += module.h generic-y += trace_clock.h generic-y += xor.h +generic-y += preempt.h --- a/arch/hexagon/include/asm/Kbuild +++ b/arch/hexagon/include/asm/Kbuild @@ -53,3 +53,4 @@ generic-y += types.h generic-y += ucontext.h generic-y += unaligned.h generic-y += xor.h +generic-y += preempt.h --- a/arch/ia64/include/asm/Kbuild +++ b/arch/ia64/include/asm/Kbuild @@ -3,4 +3,5 @@ generic-y += clkdev.h generic-y += exec.h generic-y += kvm_para.h generic-y += trace_clock.h +generic-y += preempt.h generic-y += vtime.h \ No newline at end of file --- a/arch/m32r/include/asm/Kbuild +++ b/arch/m32r/include/asm/Kbuild @@ -3,3 +3,4 @@ generic-y += clkdev.h generic-y += exec.h generic-y += module.h generic-y += trace_clock.h +generic-y += preempt.h --- a/arch/m68k/include/asm/Kbuild +++ b/arch/m68k/include/asm/Kbuild @@ -31,3 +31,4 @@ generic-y += trace_clock.h generic-y += types.h generic-y += word-at-a-time.h generic-y += xor.h +generic-y += preempt.h --- a/arch/metag/include/asm/Kbuild +++ b/arch/metag/include/asm/Kbuild @@ -52,3 +52,4 @@ generic-y += unaligned.h generic-y += user.h generic-y += vga.h generic-y += xor.h +generic-y += preempt.h --- a/arch/microblaze/include/asm/Kbuild +++ b/arch/microblaze/include/asm/Kbuild @@ -3,3 +3,4 @@ generic-y += clkdev.h generic-y += exec.h generic-y += trace_clock.h generic-y += syscalls.h +generic-y += preempt.h --- a/arch/mips/include/asm/Kbuild +++ b/arch/mips/include/asm/Kbuild @@ -11,5 +11,6 @@ generic-y += sections.h generic-y += segment.h generic-y += serial.h generic-y += trace_clock.h +generic-y += preempt.h generic-y += ucontext.h generic-y += xor.h --- a/arch/mn10300/include/asm/Kbuild +++ b/arch/mn10300/include/asm/Kbuild @@ -2,3 +2,4 @@ generic-y += clkdev.h generic-y += exec.h generic-y += trace_clock.h +generic-y += preempt.h --- a/arch/openrisc/include/asm/Kbuild +++ b/arch/openrisc/include/asm/Kbuild @@ -67,3 +67,4 @@ generic-y += ucontext.h generic-y += user.h generic-y += word-at-a-time.h generic-y += xor.h +generic-y += preempt.h --- a/arch/parisc/include/asm/Kbuild +++ b/arch/parisc/include/asm/Kbuild @@ -4,3 +4,4 @@ generic-y += word-at-a-time.h auxvec.h u div64.h irq_regs.h kdebug.h kvm_para.h local64.h local.h param.h \ poll.h xor.h clkdev.h exec.h generic-y += trace_clock.h +generic-y += preempt.h --- a/arch/powerpc/include/asm/Kbuild +++ b/arch/powerpc/include/asm/Kbuild @@ -2,4 +2,5 @@ generic-y += clkdev.h generic-y += rwsem.h generic-y += trace_clock.h +generic-y += preempt.h generic-y += vtime.h \ No newline at end of file --- a/arch/s390/include/asm/Kbuild +++ b/arch/s390/include/asm/Kbuild @@ -2,3 +2,4 @@ generic-y += clkdev.h generic-y += trace_clock.h +generic-y += preempt.h --- a/arch/score/include/asm/Kbuild +++ b/arch/score/include/asm/Kbuild @@ -4,3 +4,4 @@ header-y += generic-y += clkdev.h generic-y += trace_clock.h generic-y += xor.h +generic-y += preempt.h --- a/arch/sh/include/asm/Kbuild +++ b/arch/sh/include/asm/Kbuild @@ -34,3 +34,4 @@ generic-y += termios.h generic-y += trace_clock.h generic-y += ucontext.h generic-y += xor.h +generic-y += preempt.h --- a/arch/sparc/include/asm/Kbuild +++ b/arch/sparc/include/asm/Kbuild @@ -16,3 +16,4 @@ generic-y += serial.h generic-y += trace_clock.h generic-y += types.h generic-y += word-at-a-time.h +generic-y += preempt.h --- a/arch/tile/include/asm/Kbuild +++ b/arch/tile/include/asm/Kbuild @@ -38,3 +38,4 @@ generic-y += termios.h generic-y += trace_clock.h generic-y += types.h generic-y += xor.h +generic-y += preempt.h --- a/arch/um/include/asm/Kbuild +++ b/arch/um/include/asm/Kbuild @@ -3,3 +3,4 @@ generic-y += hw_irq.h irq_regs.h kdebug. generic-y += ftrace.h pci.h io.h param.h delay.h mutex.h current.h exec.h generic-y += switch_to.h clkdev.h generic-y += trace_clock.h +generic-y += preempt.h --- a/arch/unicore32/include/asm/Kbuild +++ b/arch/unicore32/include/asm/Kbuild @@ -60,3 +60,4 @@ generic-y += unaligned.h generic-y += user.h generic-y += vga.h generic-y += xor.h +generic-y += preempt.h --- a/arch/x86/include/asm/Kbuild +++ b/arch/x86/include/asm/Kbuild @@ -5,3 +5,4 @@ genhdr-y += unistd_64.h genhdr-y += unistd_x32.h generic-y += clkdev.h +generic-y += preempt.h --- a/arch/xtensa/include/asm/Kbuild +++ b/arch/xtensa/include/asm/Kbuild @@ -28,3 +28,4 @@ generic-y += termios.h generic-y += topology.h generic-y += trace_clock.h generic-y += xor.h +generic-y += preempt.h --- /dev/null +++ b/include/asm-generic/preempt.h @@ -0,0 +1,44 @@ +#ifndef __ASM_PREEMPT_H +#define __ASM_PREEMPT_H + +#include + +/* + * We mask the PREEMPT_NEED_RESCHED bit so as not to confuse all current users + * that think a non-zero value indicates we cannot preempt. + */ +static __always_inline int preempt_count(void) +{ + return current_thread_info()->preempt_count & ~PREEMPT_NEED_RESCHED; +} + +static __always_inline int *preempt_count_ptr(void) +{ + return ¤t_thread_info()->preempt_count; +} + +/* + * We fold the NEED_RESCHED bit into the preempt count such that + * preempt_enable() can decrement and test for needing to reschedule with a + * single instruction. + * + * We invert the actual bit, so that when the decrement hits 0 we know we both + * need to resched (the bit is cleared) and can resched (no preempt count). + */ + +static __always_inline void set_preempt_need_resched(void) +{ + *preempt_count_ptr() &= ~PREEMPT_NEED_RESCHED; +} + +static __always_inline void clear_preempt_need_resched(void) +{ + *preempt_count_ptr() |= PREEMPT_NEED_RESCHED; +} + +static __always_inline bool test_preempt_need_resched(void) +{ + return !(*preempt_count_ptr() & PREEMPT_NEED_RESCHED); +} + +#endif /* __ASM_PREEMPT_H */ --- a/include/linux/preempt.h +++ b/include/linux/preempt.h @@ -6,7 +6,6 @@ * preempt_count (used for kernel preemption, interrupt count, etc.) */ -#include #include #include @@ -16,43 +15,7 @@ */ #define PREEMPT_NEED_RESCHED 0x80000000 -/* - * We mask the PREEMPT_NEED_RESCHED bit so as not to confuse all current users - * that think a non-zero value indicates we cannot preempt. - */ -static __always_inline int preempt_count(void) -{ - return current_thread_info()->preempt_count & ~PREEMPT_NEED_RESCHED; -} - -static __always_inline int *preempt_count_ptr(void) -{ - return ¤t_thread_info()->preempt_count; -} - -/* - * We fold the NEED_RESCHED bit into the preempt count such that - * preempt_enable() can decrement and test for needing to reschedule with a - * single instruction. - * - * We invert the actual bit, so that when the decrement hits 0 we know we both - * need to resched (the bit is cleared) and can resched (no preempt count). - */ - -static __always_inline void set_preempt_need_resched(void) -{ - *preempt_count_ptr() &= ~PREEMPT_NEED_RESCHED; -} - -static __always_inline void clear_preempt_need_resched(void) -{ - *preempt_count_ptr() |= PREEMPT_NEED_RESCHED; -} - -static __always_inline bool test_preempt_need_resched(void) -{ - return !(*preempt_count_ptr() & PREEMPT_NEED_RESCHED); -} +#include #if defined(CONFIG_DEBUG_PREEMPT) || defined(CONFIG_PREEMPT_TRACER) extern void add_preempt_count(int val); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/