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Date: Wed, 16 Dec 2009 13:32:53 +1100
From: andrew hendry <andrew.hendry@...il.com>
To: startww3@...ox.com
Cc: linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: irqflags
I think you have used the instructions for reporting a bug to send a
patch. You should send your patch as a diff in mail so people can
easily see whats changed. Also include the maintainer, signed off, and
patch in the mail title.
see Documentation/SubmittingPatches
On Wed, Dec 16, 2009 at 1:06 PM, <startww3@...ox.com> wrote:
>
> 1) Summary:
> 'include/linux/irqflags.h' contains incorrect code
> (at least for x86_64) in sections where
> TRACE_IRQFLAGS_SUPPORT is not defined.
>
> i.e.) when 'arch/x86/Kconfig.debug' contains:
> config TRACE_IRQFLAGS_SUPPORT
> def_bool n
>
>
> 2) Full Description:
> patch 'include/linux/irqflags.h' as per attached file
> (also duplicated below in text).
>
>
> 3) Keywords:
> irqflags, irqflags.h, Kconfig.debug
>
>
> 7.1) scripts/ver_linux:
> Linux localhost 2.6.31.6 #2 Mon Dec 14 15:25:35 EST 2009 x86_64 x86_64 x86_64 GNU/Linux
>
> Gnu C 4.4.2
> Gnu make 3.81
> binutils 2.19.51.0.14
> util-linux 2.16
> mount support
> module-init-tools 3.9
> e2fsprogs 1.41.9
> xfsprogs 3.0.3
> quota-tools 3.17.
> PPP 2.4.4
> Linux C Library 2.11
> Dynamic linker (ldd) 2.11
> Procps 3.2.8
> Net-tools 1.60
> Kbd 1.15
> oprofile 0.9.5
> Sh-utils 7.6
> Modules Loaded vboxnetadp vboxnetflt vboxdrv dm_multipath nvidia snd_via82xx snd_ac97_codec ac97_bus snd_mpu401_uart snd_rawmidi via_rhine sg sr_mod cdrom usb_storage mii ata_generic sd_mod
>
>
> 7.2) Cpuinfo:
> processor : 0
> vendor_id : AuthenticAMD
> cpu family : 15
> model : 44
> model name : AMD Sempron(tm) Processor 3100+
> stepping : 2
> cpu MHz : 1808.299
> cache size : 256 KB
> fpu : yes
> fpu_exception : yes
> cpuid level : 1
> wp : yes
> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt lm 3dnowext 3dnow rep_good pni lahf_lm
> bogomips : 3616.59
> TLB size : 1024 4K pages
> clflush size : 64
> cache_alignment : 64
> address sizes : 40 bits physical, 48 bits virtual
> power management: ts fid vid ttp tm stc
>
>
> X) Patched 'include/linux/irqflags.h'
> (tested and works under AMD K8 fc12 2.6.31):
>
> /*
> * include/linux/irqflags.h
> *
> * IRQ flags tracing: follow the state of the hardirq and softirq flags and
> * provide callbacks for transitions between ON and OFF states.
> *
> * This file gets included from lowlevel asm headers too, to provide
> * wrapped versions of the local_irq_*() APIs, based on the
> * raw_local_irq_*() macros from the lowlevel headers.
> */
> #ifndef _LINUX_TRACE_IRQFLAGS_H
> #define _LINUX_TRACE_IRQFLAGS_H
>
> #include <linux/typecheck.h>
>
> #ifdef CONFIG_TRACE_IRQFLAGS
> extern void trace_softirqs_on(unsigned long ip);
> extern void trace_softirqs_off(unsigned long ip);
> extern void trace_hardirqs_on(void);
> extern void trace_hardirqs_off(void);
> # define trace_hardirq_context(p) ((p)->hardirq_context)
> # define trace_softirq_context(p) ((p)->softirq_context)
> # define trace_hardirqs_enabled(p) ((p)->hardirqs_enabled)
> # define trace_softirqs_enabled(p) ((p)->softirqs_enabled)
> # define trace_hardirq_enter() do { current->hardirq_context++; } while (0)
> # define trace_hardirq_exit() do { current->hardirq_context--; } while (0)
> # define lockdep_softirq_enter() do { current->softirq_context++; } while (0)
> # define lockdep_softirq_exit() do { current->softirq_context--; } while (0)
> # define INIT_TRACE_IRQFLAGS .softirqs_enabled = 1,
> #else
> # define trace_hardirqs_on() do { } while (0)
> # define trace_hardirqs_off() do { } while (0)
> # define trace_softirqs_on(ip) do { } while (0)
> # define trace_softirqs_off(ip) do { } while (0)
> # define trace_hardirq_context(p) 0
> # define trace_softirq_context(p) 0
> # define trace_hardirqs_enabled(p) 0
> # define trace_softirqs_enabled(p) 0
> # define trace_hardirq_enter() do { } while (0)
> # define trace_hardirq_exit() do { } while (0)
> # define lockdep_softirq_enter() do { } while (0)
> # define lockdep_softirq_exit() do { } while (0)
> # define INIT_TRACE_IRQFLAGS
> #endif
>
> #if defined(CONFIG_IRQSOFF_TRACER) || \
> defined(CONFIG_PREEMPT_TRACER)
> extern void stop_critical_timings(void);
> extern void start_critical_timings(void);
> #else
> # define stop_critical_timings() do { } while (0)
> # define start_critical_timings() do { } while (0)
> #endif
>
> #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
>
> #include <asm/irqflags.h>
>
> #define local_irq_enable() \
> do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
> #define local_irq_disable() \
> do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
> #define local_irq_save(flags) \
> do { \
> typecheck(unsigned long, flags); \
> raw_local_irq_save(flags); \
> trace_hardirqs_off(); \
> } while (0)
>
>
> #define local_irq_restore(flags) \
> do { \
> typecheck(unsigned long, flags); \
> if (raw_irqs_disabled_flags(flags)) { \
> raw_local_irq_restore(flags); \
> trace_hardirqs_off(); \
> } else { \
> trace_hardirqs_on(); \
> raw_local_irq_restore(flags); \
> } \
> } while (0)
> #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
> /*
> * The local_irq_*() APIs are equal to the raw_local_irq*()
> * if !TRACE_IRQFLAGS.
> */
>
> #include <asm/irqflags.h>
>
> # define local_irq_disable() raw_local_irq_disable()
> # define local_irq_enable() raw_local_irq_enable()
> # define local_irq_save(flags) raw_local_irq_save(flags)
> # define local_irq_restore(flags) raw_local_irq_restore(flags)
>
> #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
>
>
>
>
> #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
> #define safe_halt() \
> do { \
> trace_hardirqs_on(); \
> raw_safe_halt(); \
> } while (0)
>
> #define local_save_flags(flags) \
> do { \
> typecheck(unsigned long, flags); \
> raw_local_save_flags(flags); \
> } while (0)
>
> #define irqs_disabled() \
> ({ \
> unsigned long _flags; \
> \
> raw_local_save_flags(_flags); \
> raw_irqs_disabled_flags(_flags); \
> })
>
> #define irqs_disabled_flags(flags) \
> ({ \
> typecheck(unsigned long, flags); \
> raw_irqs_disabled_flags(flags); \
> })
>
> #else
>
> #define safe_halt() raw_safe_halt()
>
> #define local_save_flags(flags) raw_local_save_flags(flags)
>
> #define irqs_disabled() \
> ({ \
> unsigned long _flags; \
> \
> raw_local_save_flags(_flags); \
> raw_irqs_disabled_flags(_flags); \
> })
>
> #define irqs_disabled_flags(flags) \
> ({ \
> typecheck(unsigned long, flags); \
> raw_irqs_disabled_flags(flags); \
> })
>
> #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
>
> #endif /*_LINUX_TRACE_IRQFLAGS_H */
>
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