On Sat, Sep 19 2020 at 10:18, Linus Torvalds wrote:
> On Sat, Sep 19, 2020 at 2:50 AM Thomas Gleixner wrote:
>>
>> this provides a preemptible variant of kmap_atomic & related
>> interfaces. This is achieved by:
>
> Ack. This looks really nice, even apart from the new capability.
>
> The only thin
Hi Logan,
On 2020/9/19 4:47, Logan Gunthorpe wrote:
Hi Lu,
On 2020-09-11 9:21 p.m., Lu Baolu wrote:
Tom Murphy has almost done all the work. His latest patch series was
posted here.
https://lore.kernel.org/linux-iommu/20200903201839.7327-1-murph...@tcd.ie/
Thanks a lot!
This series is a fol
On Sat, Sep 19 2020 at 12:37, Daniel Vetter wrote:
> On Sat, Sep 19, 2020 at 12:35 PM Daniel Vetter wrote:
>> I think it should be the case, but I want to double check: Will
>> copy_*_user be allowed within a kmap_temporary section? This would
>> allow us to ditch an absolute pile of slowpaths.
>
On Sat, Sep 19, 2020 at 10:39 AM Matthew Wilcox wrote:
>
> My concern with that is people might use kmap() and then pass the address
> to a different task. So we need to audit the current users of kmap()
> and convert any that do that into using vmap() instead.
Ahh. Yes, I guess they might do th
On Sat, Sep 19, 2020 at 10:18:54AM -0700, Linus Torvalds wrote:
> On Sat, Sep 19, 2020 at 2:50 AM Thomas Gleixner wrote:
> >
> > this provides a preemptible variant of kmap_atomic & related
> > interfaces. This is achieved by:
>
> Ack. This looks really nice, even apart from the new capability.
>
On Sat, Sep 19, 2020 at 2:50 AM Thomas Gleixner wrote:
>
> this provides a preemptible variant of kmap_atomic & related
> interfaces. This is achieved by:
Ack. This looks really nice, even apart from the new capability.
The only thing I really reacted to is that the name doesn't make sense
to me
== Series Details ==
Series: managed drm_device, absolute final leftover bits (rev4)
URL : https://patchwork.freedesktop.org/series/81851/
State : success
== Summary ==
CI Bug Log - changes from CI_DRM_9025_full -> Patchwork_18536_full
Summ
== Series Details ==
Series: managed drm_device, absolute final leftover bits (rev4)
URL : https://patchwork.freedesktop.org/series/81851/
State : success
== Summary ==
CI Bug Log - changes from CI_DRM_9025 -> Patchwork_18536
Summary
--
== Series Details ==
Series: managed drm_device, absolute final leftover bits (rev4)
URL : https://patchwork.freedesktop.org/series/81851/
State : warning
== Summary ==
$ dim checkpatch origin/drm-tip
63ea6d97c1ee drm/i915/selftest: Create mock_destroy_device
-:185: WARNING:NO_AUTHOR_SIGN_OFF:
To avoid having to create all the device and driver scaffolding we
just manually create and destroy a devres_group.
v2: Rebased
v3: use devres_open/release_group so we can use devm without real
hacks in the driver core or having to create an entire fake bus for
testing drivers. Might want to extr
To avoid having to create all the device and driver scaffolding we
just manually create and destroy a devres_group.
v2: Rebased
v3: use devres_open/release_group so we can use devm without real
hacks in the driver core or having to create an entire fake bus for
testing drivers. Might want to extr
== Series Details ==
Series: mm/highmem: Provide a preemptible variant of kmap_atomic & friends
URL : https://patchwork.freedesktop.org/series/81869/
State : success
== Summary ==
CI Bug Log - changes from CI_DRM_9025_full -> Patchwork_18535_full
===
On Sat, Sep 19, 2020 at 12:35 PM Daniel Vetter wrote:
>
> On Sat, Sep 19, 2020 at 11:50 AM Thomas Gleixner wrote:
> >
> > First of all, sorry for the horribly big Cc list!
> >
> > Following up to the discussion in:
> >
> > https://lore.kernel.org/r/20200914204209.256266...@linutronix.de
> >
> >
On Sat, Sep 19, 2020 at 11:50 AM Thomas Gleixner wrote:
>
> First of all, sorry for the horribly big Cc list!
>
> Following up to the discussion in:
>
> https://lore.kernel.org/r/20200914204209.256266...@linutronix.de
>
> this provides a preemptible variant of kmap_atomic & related
> interfaces.
== Series Details ==
Series: mm/highmem: Provide a preemptible variant of kmap_atomic & friends
URL : https://patchwork.freedesktop.org/series/81869/
State : success
== Summary ==
CI Bug Log - changes from CI_DRM_9025 -> Patchwork_18535
Sum
== Series Details ==
Series: mm/highmem: Provide a preemptible variant of kmap_atomic & friends
URL : https://patchwork.freedesktop.org/series/81869/
State : warning
== Summary ==
$ dim sparse --fast origin/drm-tip
Sparse version: v0.6.2
Fast mode used, each commit won't be checked separately.
== Series Details ==
Series: mm/highmem: Provide a preemptible variant of kmap_atomic & friends
URL : https://patchwork.freedesktop.org/series/81869/
State : warning
== Summary ==
$ dim checkpatch origin/drm-tip
09e63fe3f428 mm/highmem: Un-EXPORT __kmap_atomic_idx()
255bffcadf05 highmem: Provi
Signed-off-by: Thomas Gleixner
Cc: "David S. Miller"
Cc: sparcli...@vger.kernel.org
---
Note: Completely untested
---
arch/sparc/Kconfig |1
arch/sparc/include/asm/highmem.h |7 +-
arch/sparc/mm/Makefile |3 -
arch/sparc/mm/highmem.c | 115 -
Instead of storing the map per CPU provide and use per task storage. That
prepares for temporary kmaps which are preemptible.
The context switch code is preparatory and not yet in use because
kmap_atomic() runs with preemption disabled. Will be made usable in the
next step.
Signed-off-by: Thomas
Signed-off-by: Thomas Gleixner
Cc: Thomas Bogendoerfer
Cc: linux-m...@vger.kernel.org
---
Note: Completely untested
---
arch/mips/Kconfig |1
arch/mips/include/asm/highmem.h |4 +-
arch/mips/mm/highmem.c | 77
arch/mips/m
Signed-off-by: Thomas Gleixner
Cc: Michael Ellerman
Cc: Benjamin Herrenschmidt
Cc: Paul Mackerras
Cc: linuxppc-...@lists.ozlabs.org
---
Note: Completely untested
---
arch/powerpc/Kconfig |1
arch/powerpc/include/asm/highmem.h |6 ++-
arch/powerpc/mm/Makefile |
Nothing in modules can use that.
Signed-off-by: Thomas Gleixner
---
mm/highmem.c |2 --
1 file changed, 2 deletions(-)
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -108,8 +108,6 @@ static inline wait_queue_head_t *get_pkm
atomic_long_t _totalhigh_pages __read_mostly;
EXPORT_SYMBOL(_totalhigh_
Signed-off-by: Thomas Gleixner
Cc: Guo Ren
Cc: linux-c...@vger.kernel.org
---
Note: Completely untested
---
arch/csky/Kconfig |1
arch/csky/include/asm/highmem.h |4 +-
arch/csky/mm/highmem.c | 75
3 files changed, 5 inse
Now that the kmap atomic index is stored in task struct provide a
preemptible variant. On context switch the maps of an outgoing task are
removed and the map of the incoming task are restored. That's obviously
slow, but highmem is slow anyway.
The kmap_temporary and iomap_temporary interfaces can
Adopt the map ordering to match the other architectures and the generic
code.
Signed-off-by: Thomas Gleixner
Cc: Vineet Gupta
Cc: linux-snps-...@lists.infradead.org
---
Note: Completely untested
---
arch/arc/Kconfig |1
arch/arc/include/asm/highmem.h |8 ++-
arch/arc/
Signed-off-by: Thomas Gleixner
---
include/linux/highmem.h | 65 ++--
mm/highmem.c| 28 +---
2 files changed, 28 insertions(+), 65 deletions(-)
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -94,27 +94,6
The mapping code is odd and looks broken. See FIXME in the comment.
Signed-off-by: Thomas Gleixner
Cc: Nick Hu
Cc: Greentime Hu
Cc: Vincent Chen
---
Note: Completely untested
---
arch/nds32/Kconfig.cpu |1
arch/nds32/include/asm/highmem.h | 21 +
arch/nds32/mm
Signed-off-by: Thomas Gleixner
Cc: Chris Zankel
Cc: Max Filippov
Cc: linux-xte...@linux-xtensa.org
---
Note: Completely untested
---
arch/xtensa/Kconfig |1
arch/xtensa/include/asm/highmem.h |9 +++
arch/xtensa/mm/highmem.c | 44 +++-
Signed-off-by: Thomas Gleixner
Cc: Michal Simek
---
Note: Completely untested
---
arch/microblaze/Kconfig |1
arch/microblaze/include/asm/highmem.h |6 ++
arch/microblaze/mm/Makefile |1
arch/microblaze/mm/highmem.c | 78 --
First of all, sorry for the horribly big Cc list!
Following up to the discussion in:
https://lore.kernel.org/r/20200914204209.256266...@linutronix.de
this provides a preemptible variant of kmap_atomic & related
interfaces. This is achieved by:
- Consolidating all kmap atomic implementations
Signed-off-by: Thomas Gleixner
Cc: Russell King
Cc: Arnd Bergmann
Cc: linux-arm-ker...@lists.infradead.org
---
Note: Completely untested
---
arch/arm/Kconfig |1
arch/arm/include/asm/highmem.h | 30 +++---
arch/arm/mm/Makefile |1
arch/arm/mm/highmem.c
Convert X86 to the generic kmap atomic implementation.
Make the iomap_atomic() naming convention consistent while at it.
Signed-off-by: Thomas Gleixner
---
arch/x86/Kconfig |3 +-
arch/x86/include/asm/fixmap.h |1
arch/x86/include/asm/highmem.h | 12 ++--
arch/x86/
The kmap_atomic* interfaces in all architectures are pretty much the same
except for post map operations (flush) and pre- and post unmap operations.
Provide a generic variant for that.
Signed-off-by: Thomas Gleixner
---
include/linux/highmem.h | 87 ---
mm/Kcon
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