On Thu, Aug 25, 2022 at 12:30 PM Naveen N. Rao
wrote:
>
> Uros Bizjak wrote:
> > The workaround for 'asm goto' miscompilation introduces a compiler
> > barrier quirk that inhibits many useful compiler optimizations. For
> > example, __try_cmpxchg_user compiles to:
> &
On Fri, Mar 24, 2023 at 3:13 PM Mark Rutland wrote:
>
> On Sun, Mar 05, 2023 at 09:56:19PM +0100, Uros Bizjak wrote:
> > Cast _oldp to the type of _ptr to avoid incompatible-pointer-types warning.
>
> Can you give an example of where we are passing an incompatible pointer?
An e
On Fri, Mar 24, 2023 at 5:33 PM Mark Rutland wrote:
>
> On Fri, Mar 24, 2023 at 04:14:22PM +, Mark Rutland wrote:
> > On Fri, Mar 24, 2023 at 04:43:32PM +0100, Uros Bizjak wrote:
> > > On Fri, Mar 24, 2023 at 3:13 PM Mark Rutland wrote:
> > > >
> >
Implement target specific support for local_try_cmpxchg.
Cc: Thomas Bogendoerfer
Signed-off-by: Uros Bizjak
---
arch/mips/include/asm/local.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/mips/include/asm/local.h b/arch/mips/include/asm/local.h
index 08366b1fd273..b611361a760b
Implement target specific support for local_try_cmpxchg.
Cc: Thomas Gleixner
Cc: Ingo Molnar
Cc: Borislav Petkov
Cc: Dave Hansen
Cc: "H. Peter Anvin"
Signed-off-by: Uros Bizjak
---
arch/x86/include/asm/local.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/x86/i
Add generic support for try_cmpxchg{,64}_local and their falbacks.
Cc: Will Deacon
Cc: Peter Zijlstra
Cc: Boqun Feng
Cc: Mark Rutland
Signed-off-by: Uros Bizjak
---
include/linux/atomic/atomic-arch-fallback.h | 24 -
include/linux/atomic/atomic-instrumented.h | 20
jlstra
Cc: Arnaldo Carvalho de Melo
Cc: Mark Rutland
Cc: Alexander Shishkin
Cc: Jiri Olsa
Cc: Namhyung Kim
Cc: Ian Rogers
Cc: Will Deacon
Cc: Boqun Feng
Cc: Jiaxun Yang
Cc: Jun Yi
Uros Bizjak (10):
locking/atomic: Add missing cast to try_cmpxchg() fallbacks
locking/atomic: Add ge
Cast _oldp to the type of _ptr to avoid incompatible-pointer-types warning.
Fixes: 29f006fdefe6 ("asm-generic/atomic: Add try_cmpxchg() fallbacks")
Cc: Will Deacon
Cc: Peter Zijlstra
Cc: Boqun Feng
Cc: Mark Rutland
Signed-off-by: Uros Bizjak
---
include/linux/atomic/atomic-arch-
Implement target specific support for local_try_cmpxchg.
Cc: Richard Henderson
Cc: Ivan Kokshaysky
Cc: Matt Turner
Signed-off-by: Uros Bizjak
---
arch/alpha/include/asm/local.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/alpha/include/asm/local.h b/arch/alpha/include/asm
Enable local_try_cmpxchg and also local64_try_cmpxchg for x86_64.
Cc: Thomas Gleixner
Cc: Ingo Molnar
Cc: Borislav Petkov
Cc: Dave Hansen
Cc: "H. Peter Anvin"
Signed-off-by: Uros Bizjak
---
arch/x86/include/asm/cmpxchg.h | 6 ++
1 file changed, 6 insertions(+)
diff --git
is no need to re-read the value in the loop.
No functional change intended.
Cc: Peter Zijlstra
Cc: Ingo Molnar
Cc: Arnaldo Carvalho de Melo
Cc: Mark Rutland
Cc: Alexander Shishkin
Cc: Jiri Olsa
Cc: Namhyung Kim
Cc: Ian Rogers
Signed-off-by: Uros Bizjak
---
kernel/events/ring_buffer.c |
Implement target specific support for local_try_cmpxchg.
Cc: Huacai Chen
Cc: WANG Xuerui
Cc: Jiaxun Yang
Cc: Jun Yi
Signed-off-by: Uros Bizjak
---
arch/loongarch/include/asm/local.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/loongarch/include/asm/local.h
b/arch/loongarch
Implement generic support for local{,64}_try_cmpxchg.
Cc: Arnd Bergmann
Signed-off-by: Uros Bizjak
---
include/asm-generic/local.h | 1 +
include/asm-generic/local64.h | 2 ++
2 files changed, 3 insertions(+)
diff --git a/include/asm-generic/local.h b/include/asm-generic/local.h
index
Implement target specific support for local_try_cmpxchg.
Cc: Michael Ellerman
Cc: Nicholas Piggin
Cc: Christophe Leroy
Cc: Signed-off-by: Uros Bizjak
Signed-off-by: Uros Bizjak
---
arch/powerpc/include/asm/local.h | 11 +++
1 file changed, 11 insertions(+)
diff --git a/arch/powerpc
On Wed, Apr 12, 2023 at 1:33 PM Peter Zijlstra wrote:
>
> On Wed, Apr 05, 2023 at 04:17:08PM +0200, Uros Bizjak wrote:
> > diff --git a/arch/powerpc/include/asm/local.h
> > b/arch/powerpc/include/asm/local.h
> > index bc4bd19b7fc2..45492fb5bf22 100644
> > --- a/ar
On Thu, Apr 6, 2023 at 10:26 AM David Laight wrote:
>
> From: Dave Hansen
> > Sent: 05 April 2023 17:37
> >
> > On 4/5/23 07:17, Uros Bizjak wrote:
> > > Add generic and target specific support for local{,64}_try_cmpxchg
> > > and wire up support for a
t;
Signed-off-by: Uros Bizjak
---
arch/x86/include/asm/cmpxchg.h | 6 ++
1 file changed, 6 insertions(+)
diff --git a/arch/x86/include/asm/cmpxchg.h b/arch/x86/include/asm/cmpxchg.h
index 94fbe6ae7431..540573f515b7 100644
--- a/arch/x86/include/asm/cmpxchg.h
+++ b/arch/x86/include/asm
This patch illustrates the transition to local{,64}_try_cmpxchg.
It is not intended to be merged as-is.
Signed-off-by: Uros Bizjak
---
arch/x86/events/core.c | 9 -
kernel/events/ring_buffer.c | 5 +++--
2 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/arch/x86/events
Rogers
Cc: Will Deacon
Cc: Boqun Feng
Cc: Jiaxun Yang
Cc: Jun Yi
Uros Bizjak (5):
locking/atomic: Add generic try_cmpxchg{,64}_local support
locking/generic: Wire up local{,64}_try_cmpxchg
locking/arch: Wire up local_try_cmpxchg
locking/x86: Define arch_try_cmpxchg_local
event
Yang
Cc: Jun Yi
Cc: Thomas Bogendoerfer
Cc: Michael Ellerman
Cc: Nicholas Piggin
Cc: Christophe Leroy
Cc: Thomas Gleixner
Cc: Ingo Molnar
Cc: Borislav Petkov
Cc: Dave Hansen
Cc: "H. Peter Anvin"
Signed-off-by: Uros Bizjak
---
arch/alpha/include/asm/local.h | 12
Add generic support for try_cmpxchg{,64}_local and their falbacks.
These provides the generic try_cmpxchg_local family of functions
from the arch_ prefixed version, also adding explicit instrumentation.
Cc: Will Deacon
Cc: Peter Zijlstra
Cc: Boqun Feng
Cc: Mark Rutland
Signed-off-by: Uros
and provide additional checking
of their input arguments.
Cc: Arnd Bergmann
Signed-off-by: Uros Bizjak
---
include/asm-generic/local.h | 1 +
include/asm-generic/local64.h | 12 +++-
2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/include/asm-generic/local.h b/include/asm
On Wed, Apr 5, 2023 at 6:37 PM Dave Hansen wrote:
>
> On 4/5/23 07:17, Uros Bizjak wrote:
> > Add generic and target specific support for local{,64}_try_cmpxchg
> > and wire up support for all targets that use local_t infrastructure.
>
> I feel like I'm missin
On Mon, Apr 3, 2023 at 12:19 PM Mark Rutland wrote:
>
> On Sun, Mar 26, 2023 at 09:28:38PM +0200, Uros Bizjak wrote:
> > On Fri, Mar 24, 2023 at 5:33 PM Mark Rutland wrote:
> > >
> > > On Fri, Mar 24, 2023 at 04:14:22PM +, Mark Rutland wrote:
> > > >
On Tue, Apr 4, 2023 at 3:19 PM Mark Rutland wrote:
>
> On Tue, Apr 04, 2023 at 02:24:38PM +0200, Uros Bizjak wrote:
> > On Mon, Apr 3, 2023 at 12:19 PM Mark Rutland wrote:
> > >
> > > On Sun, Mar 26, 2023 at 09:28:38PM +0200, Uros Bizjak wrote:
> > >
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