a2f526994e
Do not trace arch_local_save_flags(), arch_local_irq_*() and friends. Although they are marked inline, gcc may still make a function out of them and add it to the pool of functions that are traced by the function tracer. This can cause undesirable results (kernel panic, triple faults, etc). Add the notrace notation to prevent them from ever being traced. Cc: Michal Simek <monstr@monstr.eu> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
123 lines
2.6 KiB
C
123 lines
2.6 KiB
C
/*
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_MICROBLAZE_IRQFLAGS_H
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#define _ASM_MICROBLAZE_IRQFLAGS_H
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#include <linux/types.h>
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#include <asm/registers.h>
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#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
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static inline notrace unsigned long arch_local_irq_save(void)
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{
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unsigned long flags;
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asm volatile(" msrclr %0, %1 \n"
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" nop \n"
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: "=r"(flags)
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: "i"(MSR_IE)
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: "memory");
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return flags;
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}
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static inline notrace void arch_local_irq_disable(void)
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{
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/* this uses r0 without declaring it - is that correct? */
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asm volatile(" msrclr r0, %0 \n"
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" nop \n"
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:
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: "i"(MSR_IE)
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: "memory");
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}
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static inline notrace void arch_local_irq_enable(void)
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{
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/* this uses r0 without declaring it - is that correct? */
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asm volatile(" msrset r0, %0 \n"
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" nop \n"
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:
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: "i"(MSR_IE)
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: "memory");
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}
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#else /* !CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
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static inline notrace unsigned long arch_local_irq_save(void)
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{
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unsigned long flags, tmp;
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asm volatile (" mfs %0, rmsr \n"
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" nop \n"
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" andi %1, %0, %2 \n"
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" mts rmsr, %1 \n"
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" nop \n"
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: "=r"(flags), "=r"(tmp)
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: "i"(~MSR_IE)
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: "memory");
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return flags;
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}
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static inline notrace void arch_local_irq_disable(void)
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{
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unsigned long tmp;
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asm volatile(" mfs %0, rmsr \n"
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" nop \n"
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" andi %0, %0, %1 \n"
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" mts rmsr, %0 \n"
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" nop \n"
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: "=r"(tmp)
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: "i"(~MSR_IE)
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: "memory");
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}
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static inline notrace void arch_local_irq_enable(void)
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{
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unsigned long tmp;
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asm volatile(" mfs %0, rmsr \n"
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" nop \n"
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" ori %0, %0, %1 \n"
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" mts rmsr, %0 \n"
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" nop \n"
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: "=r"(tmp)
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: "i"(MSR_IE)
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: "memory");
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}
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#endif /* CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
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static inline notrace unsigned long arch_local_save_flags(void)
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{
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unsigned long flags;
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asm volatile(" mfs %0, rmsr \n"
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" nop \n"
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: "=r"(flags)
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:
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: "memory");
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return flags;
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}
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static inline notrace void arch_local_irq_restore(unsigned long flags)
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{
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asm volatile(" mts rmsr, %0 \n"
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" nop \n"
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:
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: "r"(flags)
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: "memory");
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}
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static inline notrace bool arch_irqs_disabled_flags(unsigned long flags)
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{
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return (flags & MSR_IE) == 0;
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}
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static inline notrace bool arch_irqs_disabled(void)
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{
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return arch_irqs_disabled_flags(arch_local_save_flags());
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}
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#endif /* _ASM_MICROBLAZE_IRQFLAGS_H */
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