linux-stable.git/mm/highmem.c, branch linux-3.1.y

mm: make HASHED_PAGE_VIRTUAL page_address' struct page argument const.

2011-08-17T20:00:20+00:00

Followup to 33dd4e0ec911 "mm: make some struct page's const" which missed the
HASHED_PAGE_VIRTUAL case.

Signed-off-by: Ian Campbell 
Cc: Andrea Arcangeli 
Cc: Rik van Riel 
Cc: Michel Lespinasse 
Cc: Mel Gorman 
Cc: Andrew Morton 
Signed-off-by: Linus Torvalds

mm,x86: fix kmap_atomic_push vs ioremap_32.c

2010-10-28T01:03:05+00:00

It appears i386 uses kmap_atomic infrastructure regardless of
CONFIG_HIGHMEM which results in a compile error when highmem is disabled.

Cure this by providing the needed few bits for both CONFIG_HIGHMEM and
CONFIG_X86_32.

Signed-off-by: Peter Zijlstra 
Reported-by: Chris Wilson 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: stack based kmap_atomic()

2010-10-26T23:52:08+00:00

Keep the current interface but ignore the KM_type and use a stack based
approach.

The advantage is that we get rid of crappy code like:

	#define __KM_PTE			\
		(in_nmi() ? KM_NMI_PTE : 	\
		 in_irq() ? KM_IRQ_PTE :	\
		 KM_PTE0)

and in general can stop worrying about what context we're in and what kmap
slots might be appropriate for that.

The downside is that FRV kmap_atomic() gets more expensive.

For now we use a CPP trick suggested by Andrew:

  #define kmap_atomic(page, args...) __kmap_atomic(page)

to avoid having to touch all kmap_atomic() users in a single patch.

[ not compiled on:
  - mn10300: the arch doesn't actually build with highmem to begin with ]

[akpm@linux-foundation.org: coding-style fixes]
[akpm@linux-foundation.org: fix up drivers/gpu/drm/i915/intel_overlay.c]
Acked-by: Rik van Riel 
Signed-off-by: Peter Zijlstra 
Acked-by: Chris Metcalf 
Cc: David Howells 
Cc: Hugh Dickins 
Cc: Ingo Molnar 
Cc: Thomas Gleixner 
Cc: "H. Peter Anvin" 
Cc: Steven Rostedt 
Cc: Russell King 
Cc: Ralf Baechle 
Cc: David Miller 
Cc: Paul Mackerras 
Cc: Benjamin Herrenschmidt 
Cc: Dave Airlie 
Cc: Li Zefan 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm,kdb,kgdb: Add a debug reference for the kdb kmap usage

2010-08-05T14:22:24+00:00

The kdb kmap should never get used outside of the kernel debugger
exception context.

Signed-off-by: Jason Wessel
CC: Andrew Morton 
CC: Ingo Molnar 
CC: linux-mm@kvack.org

highmem: remove unneeded #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT for debug_kmap_atomic()

2010-05-25T15:07:01+00:00

In f4112de6b679d84bd9b9681c7504be7bdfb7c7d5 ("mm: introduce
debug_kmap_atomic") I said that debug_kmap_atomic() needs
CONFIG_TRACE_IRQFLAGS_SUPPORT.

It was wrong.  (I thought irqs_disabled() is only available when the
architecture has CONFIG_TRACE_IRQFLAGS_SUPPORT)

Remove the #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT check to enable
kmap_atomic() debugging for the architectures which do not have
CONFIG_TRACE_IRQFLAGS_SUPPORT.

Reported-by: Andrew Morton 
Signed-off-by: Akinobu Mita 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

grammar fix in comment

2010-02-05T11:22:40+00:00

Signed-off-by: Uwe Kleine-König 
Cc: Nicolas Pitre 
Signed-off-by: Jiri Kosina

highmem: Fix debug_kmap_atomic() to also handle KM_IRQ_PTE, KM_NMI, and KM_NMI_PTE

2009-11-10T03:15:47+00:00

Previously calling debug_kmap_atomic() with these types would
cause spurious warnings.

(triggered by SysProf using perf events)

Signed-off-by: Soeren Sandmann Pedersen 
Cc: Linus Torvalds 
Cc: a.p.zijlstra@chello.nl
Cc:  # .31.x
LKML-Reference: 
Signed-off-by: Ingo Molnar

highmem: Fix race in debug_kmap_atomic() which could cause warn_count to underflow

2009-11-10T03:15:32+00:00

debug_kmap_atomic() tries to prevent ever printing more than 10
warnings, but it does so by testing whether an unsigned integer
is equal to 0. However, if the warning is caused by a nested
IRQ, then this counter may underflow and the stream of warnings
will never end.

Fix that by using a signed integer instead.

Signed-off-by: Soeren Sandmann Pedersen 
Cc: Linus Torvalds 
Cc: a.p.zijlstra@chello.nl
Cc:  # .31.x
LKML-Reference: 
Signed-off-by: Ingo Molnar

block: remove some includings of blktrace_api.h

2009-06-16T09:19:36+00:00

When porting blktrace to tracepoints, we changed to trace/block.h
for trace prober declarations.

Signed-off-by: Li Zefan 
Signed-off-by: Jens Axboe

mm: introduce debug_kmap_atomic

2009-04-01T15:59:14+00:00

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 
Cc: Thomas Gleixner 
Cc: Ingo Molnar 
Cc: "H. Peter Anvin" 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds