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mm: introduce debug_kmap_atomic

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x86 has debug_kmap_atomic_prot() which is error checking function for
kmap_atomic.  It is usefull for the other architectures, although it needs
CONFIG_TRACE_IRQFLAGS_SUPPORT.

This patch exposes it to the other architectures.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Akinobu Mita 2009-03-31 15:23:25 -07:00 • committed by Linus Torvalds
commit f4112de6b6
3 changed files with 58 additions and 44 deletions
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12
include/linux/highmem.h
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@ -187,4 +187,16 @@ static inline void copy_highpage(struct page *to, struct page *from)
kunmap_atomic(vto, KM_USER1);
}
#if defined(CONFIG_DEBUG_HIGHMEM) && defined(CONFIG_TRACE_IRQFLAGS_SUPPORT)
void debug_kmap_atomic(enum km_type type);
#else
static inline void debug_kmap_atomic(enum km_type type)
{
}
#endif
#endif /* _LINUX_HIGHMEM_H */