forked from luck/tmp_suning_uos_patched
18d85bc558
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. Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: David S. Miller <davem@davemloft.net>
98 lines
1.9 KiB
C
98 lines
1.9 KiB
C
/*
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* include/asm/irqflags.h
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*
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* IRQ flags handling
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*
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* This file gets included from lowlevel asm headers too, to provide
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* wrapped versions of the local_irq_*() APIs, based on the
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* arch_local_irq_*() functions from the lowlevel headers.
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*/
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#ifndef _ASM_IRQFLAGS_H
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#define _ASM_IRQFLAGS_H
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#include <asm/pil.h>
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#ifndef __ASSEMBLY__
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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__(
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"rdpr %%pil, %0"
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: "=r" (flags)
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);
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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__(
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"wrpr %0, %%pil"
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: /* no output */
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: "r" (flags)
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: "memory"
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);
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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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__asm__ __volatile__(
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"wrpr %0, %%pil"
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: /* no outputs */
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: "i" (PIL_NORMAL_MAX)
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: "memory"
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);
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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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__asm__ __volatile__(
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"wrpr 0, %%pil"
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: /* no outputs */
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: /* no inputs */
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: "memory"
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);
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}
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static inline notrace int arch_irqs_disabled_flags(unsigned long flags)
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{
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return (flags > 0);
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}
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static inline notrace int 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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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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/* Disable interrupts to PIL_NORMAL_MAX unless we already
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* are using PIL_NMI, in which case PIL_NMI is retained.
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*
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* The only values we ever program into the %pil are 0,
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* PIL_NORMAL_MAX and PIL_NMI.
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*
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* Since PIL_NMI is the largest %pil value and all bits are
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* set in it (0xf), it doesn't matter what PIL_NORMAL_MAX
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* actually is.
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*/
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__asm__ __volatile__(
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"rdpr %%pil, %0\n\t"
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"or %0, %2, %1\n\t"
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"wrpr %1, 0x0, %%pil"
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: "=r" (flags), "=r" (tmp)
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: "i" (PIL_NORMAL_MAX)
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: "memory"
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);
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return flags;
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}
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#endif /* (__ASSEMBLY__) */
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#endif /* !(_ASM_IRQFLAGS_H) */
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