On 27 December 2017 at 20:13, Linus Torvalds
wrote:
> On Wed, Dec 27, 2017 at 12:11 PM, Ard Biesheuvel
> wrote:
>>
>> I tried to keep the generic patches generic, so perhaps I should just
>> put the arm64 vmlinux.lds.S change in a patch on its own?
>
> I guess it doesn't matter, but regardless of
On Wed, Dec 27, 2017 at 12:11 PM, Ard Biesheuvel
wrote:
>
> I tried to keep the generic patches generic, so perhaps I should just
> put the arm64 vmlinux.lds.S change in a patch on its own?
I guess it doesn't matter, but regardless of where it gets introduced
I would like to see the explanation f
On 27 December 2017 at 20:07, Linus Torvalds
wrote:
> On Wed, Dec 27, 2017 at 12:50 AM, Ard Biesheuvel
> wrote:
>> diff --git a/include/linux/compiler.h b/include/linux/compiler.h
>> index 52e611ab9a6c..fe752d365334 100644
>> --- a/include/linux/compiler.h
>> +++ b/include/linux/compiler.h
>> @@
On Wed, Dec 27, 2017 at 12:50 AM, Ard Biesheuvel
wrote:
> diff --git a/include/linux/compiler.h b/include/linux/compiler.h
> index 52e611ab9a6c..fe752d365334 100644
> --- a/include/linux/compiler.h
> +++ b/include/linux/compiler.h
> @@ -327,4 +327,15 @@ static __always_inline void __write_once_siz
On 27 December 2017 at 19:54, Linus Torvalds
wrote:
> On Wed, Dec 27, 2017 at 12:50 AM, Ard Biesheuvel
> wrote:
>> diff --git a/arch/arm64/kernel/vmlinux.lds.S
>> b/arch/arm64/kernel/vmlinux.lds.S
>> index 7da3e5c366a0..49ae5b43fe2b 100644
>> --- a/arch/arm64/kernel/vmlinux.lds.S
>> +++ b/arch/a
On Wed, Dec 27, 2017 at 12:50 AM, Ard Biesheuvel
wrote:
> diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
> index 7da3e5c366a0..49ae5b43fe2b 100644
> --- a/arch/arm64/kernel/vmlinux.lds.S
> +++ b/arch/arm64/kernel/vmlinux.lds.S
> @@ -156,7 +156,7 @@ SECTIONS
>
Le 22/12/2017 à 23:53, Dan Williams a écrit :
> On Thu, Dec 21, 2017 at 12:31 PM, Brice Goglin wrote:
>> Le 20/12/2017 à 23:41, Ross Zwisler a écrit :
> [..]
>> Hello
>>
>> I can confirm that HPC runtimes are going to use these patches (at least
>> all runtimes that use hwloc for topology discover
Similar to the arm64 case, 64-bit x86 can benefit from using 32-bit
relative references rather than 64-bit absolute ones when emitting
struct jump_entry instances. Not only does this reduce the memory
footprint of the entries themselves by 50%, it also removes the need
for carrying relocation metad
On a randomly chosen distro kernel build for arm64, vmlinux.o shows the
following sections, containing jump label entries, and the associated
RELA relocation records, respectively:
...
[38088] __jump_table PROGBITS 00e19f30
0002ea10 00
In preparation of allowing architectures to use relative references
in jump_label entries [which can dramatically reduce the memory
footprint], introduce abstractions for references to the 'code' and
'key' members of struct jump_entry.
Signed-off-by: Ard Biesheuvel
---
arch/arm/include/asm/jump_
To avoid the need for relocating absolute references to tracepoint
structures at boot time when running relocatable kernels (which may
take a disproportionate amount of space), add the option to emit
these tables as relative references instead.
Cc: Steven Rostedt
Cc: Ingo Molnar
Signed-off-by: A
Allow the PCI quirk tables to be emitted in a way that avoids absolute
references to the hook functions. This reduces the size of the entries,
and, more importantly, makes them invariant under runtime relocation
(e.g., for KASLR)
Acked-by: Bjorn Helgaas
Signed-off-by: Ard Biesheuvel
---
drivers
Allow the initcall tables to be emitted using relative references that
are only half the size on 64-bit architectures and don't require fixups
at runtime on relocatable kernels.
Cc: Petr Mladek
Cc: Sergey Senozhatsky
Cc: Steven Rostedt
Cc: James Morris
Cc: "Serge E. Hallyn"
Signed-off-by: Ard
An ordinary arm64 defconfig build has ~64 KB worth of __ksymtab
entries, each consisting of two 64-bit fields containing absolute
references, to the symbol itself and to a char array containing
its name, respectively.
When we build the same configuration with KASLR enabled, we end
up with an addit
Before updating certain subsystems to use place relative 32-bit
relocations in special sections, to save space and reduce the
number of absolute relocations that need to be processed at runtime
by relocatable kernels, introduce the Kconfig symbol and define it
for some architectures that should be
This adds support for emitting special sections such as initcall arrays,
PCI fixups and tracepoints as relative references rather than absolute
references. This reduces the size by 50% on 64-bit architectures, but
more importantly, it removes the need for carrying relocation metadata
for these sect
16 matches
Mail list logo
