kernel test robot wrote:
Hi Sathvika,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on powerpc/topic/ppc-kvm]
[also build test ERROR on linus/master v6.0-rc5]
[cannot apply to powerpc/next masahiroy-kbuild/for-next next-20220912]
[If your patch is applied to the wron
> On 12 Sep 2022, at 10:15 pm, Nicholas Piggin wrote:
>
> On Wed Aug 24, 2022 at 12:05 PM AEST, Rohan McLure wrote:
>> Zero GPRS r0, r2-r11, r14-r31, on entry into the kernel for all
>> other interrupt sources to limit influence of user-space values
>> in potential speculation gadgets. The rem
On Thu, Sep 15, 2022 at 6:07 PM Anshuman Khandual
wrote:
>
>
>
> On 9/9/22 11:05, Barry Song wrote:
> > On Fri, Sep 9, 2022 at 5:24 PM Anshuman Khandual
> > wrote:
> >>
> >>
> >>
> >> On 8/22/22 13:51, Yicong Yang wrote:
> >>> From: Barry Song
> >>>
> >>> on x86, batched and deferred tlb shootdo
Le 08/09/2022 à 15:55, Zheng Yongjun a écrit :
> [Vous ne recevez pas souvent de courriers de zhengyongj...@huawei.com.
> Découvrez pourquoi ceci est important à
> https://aka.ms/LearnAboutSenderIdentification ]
>
> Should check of_iomap return value 'fep->fec.fecp' instead of 'fep->fcc.fccp'
On 9/9/22 11:05, Barry Song wrote:
> On Fri, Sep 9, 2022 at 5:24 PM Anshuman Khandual
> wrote:
>>
>>
>>
>> On 8/22/22 13:51, Yicong Yang wrote:
>>> From: Barry Song
>>>
>>> on x86, batched and deferred tlb shootdown has lead to 90%
>>> performance increase on tlb shootdown. on arm64, HW can do
Le 14/09/2022 à 17:47, Nicholas Piggin a écrit :
> Const function pointers live in .data.rel.ro rather than .rodata because
> they must be relocated. This change prevents powerpc/32 from generating
> R_PPC_UADDR32 relocations (which are not handled). The sys_call_table is
> moved to writeable mem
Le 14/09/2022 à 17:47, Nicholas Piggin a écrit :
> powerpc has a number of read-only sections and tables that are put
> after RO_DATA(). Move the __end_rodata symbol to cover these as well.
>
> Setting memory to read-only at boot is done using __init_begin,
> change that that to use __end_rodata
> On 12 Sep 2022, at 9:09 pm, Nicholas Piggin wrote:
>
> On Wed Aug 24, 2022 at 12:05 PM AEST, Rohan McLure wrote:
>> Macros for restoring and saving registers to and from the stack exist.
>> Provide macros with the same interface for clearing a range of gprs by
>> setting each register's valu
> On 12 Sep 2022, at 8:56 pm, Nicholas Piggin wrote:
>
> On Wed Aug 24, 2022 at 12:05 PM AEST, Rohan McLure wrote:
>> Cause syscall handlers to be typed as follows when called indirectly
>> throughout the kernel.
>>
>> typedef long (*syscall_fn)(unsigned long, unsigned long, unsigned long,
>>
> On 12 Sep 2022, at 7:47 pm, Nicholas Piggin wrote:
>
> On Wed Aug 24, 2022 at 12:05 PM AEST, Rohan McLure wrote:
>> Syscall handlers should not be invoked internally by their symbol names,
>> as these symbols defined by the architecture-defined SYSCALL_DEFINE
>> macro. Move the compatibility
> On 12 Sep 2022, at 7:03 pm, Nicholas Piggin wrote:
>
> On Wed Aug 24, 2022 at 12:05 PM AEST, Rohan McLure wrote:
>> Syscall #82 has been implemented for 32-bit platforms in a unique way on
>> powerpc systems. This hack will in effect guess whether the caller is
>> expecting new select semant
On Wednesday 14 September 2022 16:55:04 Mike Rapoport wrote:
> On September 14, 2022 10:43:52 AM GMT+01:00, Christophe Leroy
> wrote:
> >
> >
> >Le 14/09/2022 à 11:32, Mike Rapoport a écrit :
> >> On Tue, Sep 13, 2022 at 02:36:13PM +0200, Christophe Leroy wrote:
> >>>
> >>>
> >>> Le 13/09/2022 à
On Wed, Sep 14, 2022 at 04:55:27PM +0200, Peter Zijlstra wrote:
> On Wed, Sep 14, 2022 at 02:28:26PM +, Michael Matz wrote:
> > Don't mix DWARF debug info with DWARF-based unwinding info, the latter
> > doesn't imply the former. Out of interest: how does ORC get around the
> > need for CFI a
Hi Gaosheng,
On 9/13/22 00:50, Gaosheng Cui wrote:
> Remove the following orphan declarations from ps3av.h:
> 1. ps3av_dev_open()
> 2. ps3av_dev_close()
>
> They have been removed since commit 13a5e30cf740 ("[POWERPC] PS3:
> Rework AV settings driver"), so remove them.
I did a test build with th
On September 14, 2022 10:43:52 AM GMT+01:00, Christophe Leroy
wrote:
>
>
>Le 14/09/2022 à 11:32, Mike Rapoport a écrit :
>> On Tue, Sep 13, 2022 at 02:36:13PM +0200, Christophe Leroy wrote:
>>>
>>>
>>> Le 13/09/2022 à 08:11, Christophe Leroy a écrit :
Le 12/09/2022 à 23:16, Pali
Follow the binutils ld internal linker script and merge .got and .toc
input sections in the .got output section.
Signed-off-by: Nicholas Piggin
---
arch/powerpc/kernel/vmlinux.lds.S | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/arch/powerpc/kernel/vmlinux.lds.S
b/arch/po
ELFv2 does not use function descriptors so .opd is not required.
Signed-off-by: Nicholas Piggin
---
arch/powerpc/kernel/vmlinux.lds.S | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/powerpc/kernel/vmlinux.lds.S
b/arch/powerpc/kernel/vmlinux.lds.S
index 44050863032e..404944263db8 1006
.sdata2 is a readonly small data section for ppc32, and .data.rel.ro
is data that needs relocating but is read-only after that so these
can both be moved to the read only memory region.
Signed-off-by: Nicholas Piggin
---
arch/powerpc/kernel/vmlinux.lds.S | 20
1 file changed
This moves linker related tables from .data to read-only area.
Relocations are performed at early boot time before memory is protected,
after which there should be no modifications required.
Signed-off-by: Nicholas Piggin
---
arch/powerpc/kernel/vmlinux.lds.S | 42 ---
Following the example from the binutils default linker script, move
.got1 and .got2 out of .text, to just after RO_DATA where they are in
read-only NX memory.
Signed-off-by: Nicholas Piggin
---
arch/powerpc/kernel/vmlinux.lds.S | 21 +++--
1 file changed, 11 insertions(+), 10 del
powerpc has a number of read-only sections and tables that are put
after RO_DATA(). Move the __end_rodata symbol to cover these as well.
Setting memory to read-only at boot is done using __init_begin,
change that that to use __end_rodata.
This also affects boot dmesg, is_kernel_rodata(), and some
Const function pointers live in .data.rel.ro rather than .rodata because
they must be relocated. This change prevents powerpc/32 from generating
R_PPC_UADDR32 relocations (which are not handled). The sys_call_table is
moved to writeable memory, but a later change will move it back.
After this patc
This series is mainly about moving more things out of writable and
executable memory, and slightly moving the linker script in the
direction of the binutils ld internal linker script as we do.
Thanks,
Nick
Nicholas Piggin (7):
powerpc/build: put sys_call_table in .data.rel.ro if RELOCATABLE
p
On Wed, Sep 14, 2022 at 02:28:26PM +, Michael Matz wrote:
> Hello,
>
> On Wed, 14 Sep 2022, Peter Zijlstra wrote:
>
> > > Maybe this is semantics, but I wouldn't characterize objtool's existence
> > > as being based on the mistrust of tools. It's main motivation is to
> > > fill in the toolc
Hello,
On Wed, 14 Sep 2022, Peter Zijlstra wrote:
> > Maybe this is semantics, but I wouldn't characterize objtool's existence
> > as being based on the mistrust of tools. It's main motivation is to
> > fill in the toolchain's blind spots in asm and inline-asm, which exist
> > by design.
>
> Th
On Wed, Sep 14, 2022 at 8:17 PM Paul E. McKenney wrote:
>
> On Wed, Sep 14, 2022 at 10:15:28AM +0800, Zhouyi Zhou wrote:
> > During the cpu offlining, the sub functions of xive_teardown_cpu will
> > call __lock_acquire when CONFIG_LOCKDEP=y. The latter function will
> > travel RCU protected list,
On Wed, Sep 14, 2022 at 01:04:16AM +0100, Josh Poimboeuf wrote:
> > I will mention that objtool's existence is based on mistrust, of persons
> > (not correctly annotating stuff) and of tools (not correctly heeding those
> > annotations). The mistrust in persons is understandable and can be deal
On 9/13/22 1:45 PM, Christophe Leroy wrote:
Le 13/09/2022 à 09:40, Disha Goel a écrit :
There were commits which did code refactoring and converting some of kvm
assembly routines to C. When doing it, many of the asm-offset macro
definitions were missed to remove. Patchset here removes those.
On Wed, Sep 14, 2022 at 11:21:00AM +0100, Josh Poimboeuf wrote:
> On Mon, Sep 12, 2022 at 06:31:14AM -0500, Segher Boessenkool wrote:
> > On Fri, Sep 09, 2022 at 11:07:04AM -0700, Josh Poimboeuf wrote:
> > > 2) Noreturn functions:
> > >
> > >There's no reliable way to determine which functi
On Wed, Sep 14, 2022 at 10:15:28AM +0800, Zhouyi Zhou wrote:
> During the cpu offlining, the sub functions of xive_teardown_cpu will
> call __lock_acquire when CONFIG_LOCKDEP=y. The latter function will
> travel RCU protected list, so "WARNING: suspicious RCU usage" will be
> triggered.
>
> Try to
Hello,
On Wed, 14 Sep 2022, Josh Poimboeuf wrote:
> > >This information is needed because the
> > >code after the call to such a function is optimized out as
> > >unreachable and objtool has no way of knowing that.
> >
> > Since June we (GCC) have -funreachable-traps. This creates a
On Mon, Sep 12, 2022 at 06:31:14AM -0500, Segher Boessenkool wrote:
> Hi!
>
> On Fri, Sep 09, 2022 at 11:07:04AM -0700, Josh Poimboeuf wrote:
> > 2) Noreturn functions:
> >
> >There's no reliable way to determine which functions are designated
> >by the compiler to be noreturn (either
On 13.09.22 10:20, Alistair Popple wrote:
David Hildenbrand writes:
On 13.09.22 07:22, Alistair Popple wrote:
As noted by John Hubbard the original test relied on side effects of the
implementation of migrate_vma_setup() to detect if pages had been
swapped to disk or not. This is subject to
Le 14/09/2022 à 11:32, Mike Rapoport a écrit :
> On Tue, Sep 13, 2022 at 02:36:13PM +0200, Christophe Leroy wrote:
>>
>>
>> Le 13/09/2022 à 08:11, Christophe Leroy a écrit :
>>>
>>>
>>> Le 12/09/2022 à 23:16, Pali Rohár a écrit :
>
> My guess would be that something went wrong in the line
On Tue, Sep 13, 2022 at 02:36:13PM +0200, Christophe Leroy wrote:
>
>
> Le 13/09/2022 à 08:11, Christophe Leroy a écrit :
> >
> >
> > Le 12/09/2022 à 23:16, Pali Rohár a écrit :
> > > >
> > > > My guess would be that something went wrong in the linear map
> > > > setup, but it
> > > > won't hu
As noted by John Hubbard the original test relied on side effects of the
implementation of migrate_vma_setup() to detect if pages had been
swapped to disk or not. This is subject to change in future so
explicitly check for swap entries via pagemap instead. Fix a spelling
mistake while we're at it.
On Tue, Sep 13, 2022 at 12:02:42PM -0500, Nathan Lynch wrote:
> Michal Suchánek writes:
> > On Tue, Sep 13, 2022 at 10:59:56AM -0500, Nathan Lynch wrote:
> >> Michal Suchánek writes:
> >>
> >> > On Fri, Aug 12, 2022 at 02:14:21PM -0500, Nathan Lynch wrote:
> >> >> Laurent Dufour writes:
> >> >>
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