[PATCH 0/2] Some fixes to debug_kmap_atomic()
From: Soeren Sandmann
Date: Wed Oct 28 2009 - 13:54:01 EST
Hi,
Here are two patches that fix an issue with debug_kmap_atomic().
The first one is a pretty straightforward fix for a race that can
cause an underflow, which in turn causes the stream of warnings to
never end.
The second patch extends debug_kmap_atomic() to deal with KM_IRQ_PTE,
KM_NMI, and KM_NMI_PTE.
I was seeing this because the __get_user_pages_fast() in
arch/x86/kernel/cpu/perf_events.c ends up eventually calling
kmap_atomic() with KM_PTE, which, with CONFIG_HIGHPTE enabled, ends up
expanding to:
#define __KM_PTE \
(in_nmi() ? KM_NMI_PTE : \
in_irq() ? KM_IRQ_PTE : \
KM_PTE0)
and those KM_* types are not handled
For the second patch, I am basically pattern matching, so I might be
completely wrong.
Thanks,
Soren
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