linux-kernel - Re: [tip:core/locking] locking: Check spinlock_t/rwlock

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Date:	Mon, 3 Aug 2009 13:39:29 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	kilroyd@...glemail.com, a.p.zijlstra@...llo.nl, tglx@...utronix.de
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:core/locking] locking: Check spinlock_t/rwlock_t argument
	type on non-SMP builds too


* tip-bot for David Kilroy <kilroyd@...glemail.com> wrote:

> Commit-ID:  8d19bd347e1073e7f1ef9f8057c560a5f6be63d7
> Gitweb:     http://git.kernel.org/tip/8d19bd347e1073e7f1ef9f8057c560a5f6be63d7
> Author:     David Kilroy <kilroyd@...glemail.com>
> AuthorDate: Sun, 2 Aug 2009 19:41:05 +0100
> Committer:  Ingo Molnar <mingo@...e.hu>
> CommitDate: Sun, 2 Aug 2009 21:29:07 +0200
> 
> locking: Check spinlock_t/rwlock_t argument type on non-SMP builds too
> 
> When writing code for UP without CONFIG_DEBUG_SPINLOCK it's
> easy to get the first argument to the spinlock/rwlock functions
> wrong. This is because the parameter is not actually used in
> this configuration.
> 
> Typically you will only find out it's wrong:
> 
>  * by rebuilding with CONFIG_SMP or CONFIG_DEBUG_SPINLOCK
>  * after you've submitted your beautiful patch series
> 
> The first means a long wait, and the latter is a bit late.
> 
> Change the intermediate macros into inline functions.
> 
> -v2: Use C inlines instead of in-macro type-checks
> -v3: Correct bug in _spin_trylock_bh

x86 works fine now - but this patch broke architecture builds, such 
as the build on Alpha:

In file included from 
/home/mingo/tip/arch/alpha/kernel/sys_sable.c:25:
/home/mingo/tip/arch/alpha/include/asm/core_t2.h: In function 
't2_readb':
/home/mingo/tip/arch/alpha/include/asm/core_t2.h:451: error: 
'_spin_lock_irqsave' is static but used in inline function 
't2_readb' which is not static
/home/mingo/tip/arch/alpha/include/asm/core_t2.h:456: error: 
'_spin_unlock_irqrestore' is static but used in inline function 
't2_readb' which is not static
/home/mingo/tip/arch/alpha/include/asm/core_t2.h: In function 
't2_readw':
/home/mingo/tip/arch/alpha/include/asm/core_t2.h:465: error: 
'_spin_lock_irqsave' is static but used in inline function 
't2_readw' which is not static
/home/mingo/tip/arch/alpha/include/asm/core_t2.h:470: error: 
'_spin_unlock_irqrestore' is static but used in inline function 
't2_readw' which is not static
/home/mingo/tip/arch/alpha/include/asm/core_t2.h: In function 
't2_readl':
/home/mingo/tip/arch/alpha/include/asm/core_t2.h:483: error: 
'_spin_lock_irqsave' is static but used in inline function 
't2_readl' which is not static
/home/mingo/tip/arch/alpha/include/asm/core_t2.h:488: error: 
'_spin_unlock_irqrestore' is static but used in inline function 
't2_readl' which is not static
/home/mingo/tip/arch/alpha/include/asm/core_t2.h: In function 
't2_readq':
/home/mingo/tip/arch/alpha/include/asm/core_t2.h:497: error: 
'_spin_lock_irqsave' is static but used in inline function 
't2_readq' which is not static
/home/mingo/tip/arch/alpha/include/asm/core_t2.h:504: error: 
'_spin_unlock_irqrestore' is static but used in inline function 
't2_readq' which is not static
/home/mingo/tip/arch/alpha/include/asm/core_t2.h: In function 
't2_writeb':
/home/mingo/tip/arch/alpha/include/asm/core_t2.h:513: error: 
'_spin_lock_irqsave' is static but used in inline function 
't2_writeb' which is not static
/home/mingo/tip/arch/alpha/include/asm/core_t2.h:519: error: 
'_spin_unlock_irqrestore' is static but used in inline function 
't2_writeb' which is not static
/home/mingo/tip/arch/alpha/include/asm/core_t2.h: In function 
't2_writew':
/home/mingo/tip/arch/alpha/include/asm/core_t2.h:527: error: 
'_spin_lock_irqsave' is static but used in inline function 
't2_writew' which is not static
/home/mingo/tip/arch/alpha/include/asm/core_t2.h:533: error: 
'_spin_unlock_irqrestore' is static but used in inline function 
't2_writew' which is not static
/home/mingo/tip/arch/alpha/include/asm/core_t2.h: In function 
't2_writel':
/home/mingo/tip/arch/alpha/include/asm/core_t2.h:545: error: 
'_spin_lock_irqsave' is static but used in inline function 
't2_writel' which is not static

	Ingo
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