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Date: Fri, 2 May 2008 12:37:55 +0400
From: Alexey Dobriyan <adobriyan@...il.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: LKML <linux-kernel@...r.kernel.org>, akpm@...l.org,
Ingo Molnar <mingo@...e.hu>,
Peter Zijlstra <peterz@...radead.org>,
Christoph Hellwig <hch@...radead.org>,
Adrian Bunk <bunk@...nel.org>, linux-arch@...r.kernel.org,
dhowells@...hat.com
Subject: Re: [PATCH] add typecheck on irqsave and friends for correct flags
On Thu, May 01, 2008 at 07:51:18PM -0400, Steven Rostedt wrote:
> There has been several areas in the kernel where an int has been used
> for flags in local_irq_save and friends instead of a long. This can
> cause some hard to debug problems on some architectures.
>
> This patch adds a typecheck inside the irqsave and restore functions
> to flag these cases.
OK, at least something that uncovers such bugs.
Same checks in include/asm-frv/system.h should be removed then.
> --- linux-compile.git.orig/include/linux/irqflags.h
> +++ linux-compile.git/include/linux/irqflags.h
> @@ -49,18 +49,24 @@
> 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 { raw_local_irq_save(flags); 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 { \
> - if (raw_irqs_disabled_flags(flags)) { \
> - raw_local_irq_restore(flags); \
> - trace_hardirqs_off(); \
> - } else { \
> - trace_hardirqs_on(); \
> - raw_local_irq_restore(flags); \
> - } \
> +
> +#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 */
> /*
> @@ -69,8 +75,16 @@
> */
> # define raw_local_irq_disable() local_irq_disable()
> # define raw_local_irq_enable() local_irq_enable()
> -# define raw_local_irq_save(flags) local_irq_save(flags)
> -# define raw_local_irq_restore(flags) local_irq_restore(flags)
> +# define raw_local_irq_save(flags) \
> + do { \
> + typecheck(unsigned long, flags); \
> + local_irq_save(flags); \
> + } while (0)
> +# define raw_local_irq_restore(flags) \
> + do { \
> + typecheck(unsigned long, flags); \
> + local_irq_restore(flags); \
> + } while (0)
> #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
>
> #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
> @@ -80,7 +94,11 @@
> raw_safe_halt(); \
> } while (0)
>
> -#define local_save_flags(flags) raw_local_save_flags(flags)
> +#define local_save_flags(flags) \
> + do { \
> + typecheck(unsigned long, flags); \
> + raw_local_save_flags(flags); \
> + } while(0)
>
> #define irqs_disabled() \
> ({ \
> @@ -90,7 +108,11 @@
> raw_irqs_disabled_flags(_flags); \
> })
>
> -#define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
> +#define irqs_disabled_flags(flags) \
> +({ \
> + typecheck(unsigned long, flags); \
> + raw_irqs_disabled_flags(flags); \
> +})
> #endif /* CONFIG_X86 */
>
> #endif
> Index: linux-compile.git/include/linux/spinlock.h
> ===================================================================
> --- linux-compile.git.orig/include/linux/spinlock.h 2008-05-01 16:58:58.000000000 -0400
> +++ linux-compile.git/include/linux/spinlock.h 2008-05-01 19:16:21.000000000 -0400
> @@ -191,23 +191,53 @@ do { \
>
> #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
>
> -#define spin_lock_irqsave(lock, flags) flags = _spin_lock_irqsave(lock)
> -#define read_lock_irqsave(lock, flags) flags = _read_lock_irqsave(lock)
> -#define write_lock_irqsave(lock, flags) flags = _write_lock_irqsave(lock)
> +#define spin_lock_irqsave(lock, flags) \
> + do { \
> + typecheck(unsigned long, flags); \
> + flags = _spin_lock_irqsave(lock); \
> + } while (0)
> +#define read_lock_irqsave(lock, flags) \
> + do { \
> + typecheck(unsigned long, flags); \
> + flags = _read_lock_irqsave(lock); \
> + } while (0)
> +#define write_lock_irqsave(lock, flags) \
> + do { \
> + typecheck(unsigned long, flags); \
> + flags = _write_lock_irqsave(lock); \
> + } while (0)
>
> #ifdef CONFIG_DEBUG_LOCK_ALLOC
> -#define spin_lock_irqsave_nested(lock, flags, subclass) \
> - flags = _spin_lock_irqsave_nested(lock, subclass)
> +#define spin_lock_irqsave_nested(lock, flags, subclass) \
> + do { \
> + typecheck(unsigned long, flags); \
> + flags = _spin_lock_irqsave_nested(lock, subclass); \
> + } while (0)
> #else
> -#define spin_lock_irqsave_nested(lock, flags, subclass) \
> - flags = _spin_lock_irqsave(lock)
> +#define spin_lock_irqsave_nested(lock, flags, subclass) \
> + do { \
> + typecheck(unsigned long, flags); \
> + flags = _spin_lock_irqsave(lock); \
> + } while (0)
> #endif
>
> #else
>
> -#define spin_lock_irqsave(lock, flags) _spin_lock_irqsave(lock, flags)
> -#define read_lock_irqsave(lock, flags) _read_lock_irqsave(lock, flags)
> -#define write_lock_irqsave(lock, flags) _write_lock_irqsave(lock, flags)
> +#define spin_lock_irqsave(lock, flags) \
> + do { \
> + typecheck(unsigned long, flags); \
> + _spin_lock_irqsave(lock, flags); \
> + } while (0)
> +#define read_lock_irqsave(lock, flags) \
> + do { \
> + typecheck(unsigned long, flags); \
> + _read_lock_irqsave(lock, flags); \
> + } while (0)
> +#define write_lock_irqsave(lock, flags) \
> + do { \
> + typecheck(unsigned long, flags); \
> + _write_lock_irqsave(lock, flags); \
> + } while (0)
> #define spin_lock_irqsave_nested(lock, flags, subclass) \
> spin_lock_irqsave(lock, flags)
>
> @@ -260,16 +290,25 @@ do { \
> } while (0)
> #endif
>
> -#define spin_unlock_irqrestore(lock, flags) \
> - _spin_unlock_irqrestore(lock, flags)
> +#define spin_unlock_irqrestore(lock, flags) \
> + do { \
> + typecheck(unsigned long, flags); \
> + _spin_unlock_irqrestore(lock, flags); \
> + } while (0)
> #define spin_unlock_bh(lock) _spin_unlock_bh(lock)
>
> -#define read_unlock_irqrestore(lock, flags) \
> - _read_unlock_irqrestore(lock, flags)
> +#define read_unlock_irqrestore(lock, flags) \
> + do { \
> + typecheck(unsigned long, flags); \
> + _read_unlock_irqrestore(lock, flags); \
> + } while (0)
> #define read_unlock_bh(lock) _read_unlock_bh(lock)
>
> -#define write_unlock_irqrestore(lock, flags) \
> - _write_unlock_irqrestore(lock, flags)
> +#define write_unlock_irqrestore(lock, flags) \
> + do { \
> + typecheck(unsigned long, flags); \
> + _write_unlock_irqrestore(lock, flags); \
> + } while (0)
> #define write_unlock_bh(lock) _write_unlock_bh(lock)
>
> #define spin_trylock_bh(lock) __cond_lock(lock, _spin_trylock_bh(lock))
--
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