THREAD_ALIGN_SHIFT = THREAD_SHIFT + 1 = PAGE_SHIFT + 1
Maximum PAGE_SHIFT is 18 for 256k pages so
THREAD_ALIGN_SHIFT is 19 at the maximum.
No need to clobber cr1, it can be preserved when moving r1
into CR when we check stack overflow.
This reduces the number of instructions in Machine Check Exce
SLB faults should not be taken while the PACA save areas are live, all
memory accesses should be fetches from the kernel text, and access to
PACA and the current stack, before C code is called or any other
accesses are made.
All of these have pinned SLBs so will not take a SLB fault. Therefore
EXS
Have the real mode system call entry handler branch to the kernel
0xc000... address and then use mtmsrd to enable the MMU, rather than use
SRRs and rfid.
Commit 8729c26e675c ("powerpc/64s/exception: Move real to virt switch
into the common handler") implemented this style of real mode entry for
ot
On Tue, Jan 19, 2021 at 12:40:31PM +0530, Shivaprasad G Bhat wrote:
> Thanks for the comments!
>
>
> On 12/28/20 2:08 PM, David Gibson wrote:
>
> > On Mon, Dec 21, 2020 at 01:08:53PM +0100, Greg Kurz wrote:
> ...
> > > The overall idea looks good but I think you should consider using
> > > a thr
Hi Chris,
These two paragraphs are a little confusing and they seem slightly
repetitive. But I get the general idea. Two specific comments below:
> There are non-inline functions which get called in setup_sigcontext() to
> save register state to the thread struct. Move these functions into a
> se
Rob Herring writes:
> On Thu, Feb 4, 2021 at 10:42 AM Lakshmi Ramasubramanian
> wrote:
...
>> diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c
>> index d0e459bb2f05..51d2d8eb6c1b 100644
>> --- a/arch/powerpc/kexec/elf_64.c
>> +++ b/arch/powerpc/kexec/elf_64.c
>> @@ -19,6 +19
the module_platform_driver will call platform_driver_register.
and It will set the .owner to THIS_MODULE
Signed-off-by: Tian Tao
---
sound/soc/fsl/imx-hdmi.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/sound/soc/fsl/imx-hdmi.c b/sound/soc/fsl/imx-hdmi.c
index dbbb7618..cd0235a 100644
---
Previously when mapping kernel memory on radix, no ptesync was included
which would periodically lead to unhandled spurious faults. Mapping
kernel memory is used when code patching with Strict RWX enabled. As
suggested by Chris Riedl, turning ftrace on and off does a large amount
of code patching
When adding a pte a ptesync is needed to order the update of the pte
with subsequent accesses otherwise a spurious fault may be raised.
radix__set_pte_at() does not do this for performance gains. For
non-kernel memory this is not an issue as any faults of this kind are
corrected by the page fault
On 2/5/21 2:50 PM, Vladimir Murzin wrote:
> Hi Anshuman,
>
> On 2/5/21 4:10 AM, Anshuman Khandual wrote:
>> early_memtest() does not get called from all architectures. Hence enabling
>> CONFIG_MEMTEST and providing a valid memtest=[1..N] kernel command line
>> option might not trigger the memor
On 2/5/21 1:05 PM, Max Filippov wrote:
> On Thu, Feb 4, 2021 at 8:10 PM Anshuman Khandual
> wrote:
>>
>> early_memtest() does not get called from all architectures. Hence enabling
>> CONFIG_MEMTEST and providing a valid memtest=[1..N] kernel command line
>> option might not trigger the memory p
Signed-off-by: Christoph Hellwig
---
drivers/xen/swiotlb-xen.c | 7 +++
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index b2d9e77059bf5a..621a20c1143597 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen
Split xen_swiotlb_init into a normal an an early case. That makes both
much simpler and more readable, and also allows marking the early
code as __init and x86-only.
Signed-off-by: Christoph Hellwig
---
arch/arm/xen/mm.c | 2 +-
arch/x86/xen/pci-swiotlb-xen.c | 4 +-
drivers/xe
Use the is_swiotlb_buffer to check if a physical address is
a swiotlb buffer. This works because xen-swiotlb does use the
same buffer as the main swiotlb code, and xen_io_tlb_{start,end}
are just the addresses for it that went through phys_to_virt.
Signed-off-by: Christoph Hellwig
---
drivers/x
Lift the double initialization protection from xen-swiotlb to the core
code to avoid exposing too many swiotlb internals. Also upgrade the
check to a warning as it should not happen.
Signed-off-by: Christoph Hellwig
---
drivers/xen/swiotlb-xen.c | 7 ---
kernel/dma/swiotlb.c | 8 ++
Use the existing variable that holds the physical address for
xen_io_tlb_end to simplify xen_swiotlb_dma_supported a bit, and remove
the otherwise unused xen_io_tlb_end variable and the xen_virt_to_bus
helper.
Signed-off-by: Christoph Hellwig
---
drivers/xen/swiotlb-xen.c | 10 ++
1 file
Use the local variable that is passed to swiotlb_init_with_tbl for
freeing the memory in the failure case to isolate the code a little
better from swiotlb internals.
Signed-off-by: Christoph Hellwig
---
arch/powerpc/platforms/pseries/svm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
d
The xen_set_nslabs function is a little weird, as it has just one
caller, that caller passes a global variable as the argument,
which is then overriden in the function and a derivative of it
returned. Just add a cpp symbol for the default size using a readable
constant and open code the remaining
Hi Konrad,
this series contains a bunch of swiotlb cleanups, mostly to reduce the
amount of internals exposed to code outside of swiotlb.c, which should
helper to prepare for supporting multiple different bounce buffer pools.
The xen_io_tlb_start and xen_io_tlb_nslabs variables ar now only used in
xen_swiotlb_init, so replace them with local variables.
Signed-off-by: Christoph Hellwig
---
drivers/xen/swiotlb-xen.c | 57 +--
1 file changed, 25 insertions(+), 32 deletions(-)
diff --
On Thu, Feb 04, 2021 at 09:40:23AM +0100, Christoph Hellwig wrote:
> So one thing that has been on my mind for a while: I'd really like
> to kill the separate dma ops in Xen swiotlb. If we compare xen-swiotlb
> to swiotlb the main difference seems to be:
>
> - additional reasons to bounce I/O v
Excerpts from Michael Ellerman's message of February 2, 2021 8:31 pm:
> Nicholas Piggin writes:
>> There is no need for this to be in asm, use the new intrrupt entry wrapper.
>>
>> Signed-off-by: Nicholas Piggin
>> ---
>> arch/powerpc/include/asm/interrupt.h | 15 +
>> arch/powerpc/inc
Excerpts from Christophe Leroy's message of February 5, 2021 6:09 pm:
>
>
> Le 30/01/2021 à 14:08, Nicholas Piggin a écrit :
>> Signed-off-by: Nicholas Piggin
>> ---
>
>> diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
>> index f70d3f6174c8..7ff915aae8ec 100644
>> --- a/a
Excerpts from Nicholas Piggin's message of February 6, 2021 12:46 pm:
> Excerpts from Michael Ellerman's message of February 6, 2021 9:38 am:
>> Nicholas Piggin writes:
>>> Excerpts from Michael Ellerman's message of February 4, 2021 8:15 pm:
Nicholas Piggin writes:
> This moves the comm
On Sun, Feb 7, 2021 at 6:58 AM Rikard Falkeborn
wrote:
>
> The only usage of these is to assign their address to the 'ops' field in
> the snd_soc_dai_driver struct, which is a pointer to const. Make them
> const to allow the compiler to put them in read-only memory.
>
> Signed-off-by: Rikard Falke
Le 06/02/2021 à 18:39, Christopher M. Riedl a écrit :
On Sat Feb 6, 2021 at 10:32 AM CST, Christophe Leroy wrote:
Le 20/10/2020 à 04:01, Christopher M. Riedl a écrit :
On Fri Oct 16, 2020 at 10:48 AM CDT, Christophe Leroy wrote:
Le 15/10/2020 à 17:01, Christopher M. Riedl a écrit :
Reu
barrier_nospec() in uaccess helpers is there to protect against
speculative accesses around access_ok().
When using user_access_begin() sequences together with
unsafe_get_user() like macros, barrier_nospec() is called for
every single read although we know the access_ok() is done
onece.
Since all
On Fri, Feb 5, 2021 at 11:00 PM Mark Brown wrote:
>
> On Fri, Feb 05, 2021 at 02:57:28PM +0800, Shengjiu Wang wrote:
>
> > + if (params_format(params) == SNDRV_PCM_FORMAT_S16_LE)
> > + msg->s_msg.param.format = RPMSG_S16_LE;
> > + else if (params_format(params) == SNDRV_PCM_F
On Fri, Feb 5, 2021 at 10:27 PM Mark Brown wrote:
>
> On Fri, Feb 05, 2021 at 02:57:27PM +0800, Shengjiu Wang wrote:
>
> > + /* TYPE C is notification from M core */
> > + if (r_msg->header.type == MSG_TYPE_C) {
> > + if (r_msg->header.cmd == TX_PERIOD_DONE) {
>
> > +
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