On Fri, Mar 19, 2021 at 1:25 PM Catalin Marinas wrote:
> On Thu, Mar 18, 2021 at 09:41:54AM +0100, Arnd Bergmann wrote:
> > On Wed, Mar 17, 2021 at 5:18 PM Catalin Marinas
> > wrote:
> > > On Wed, Mar 17, 2021 at 02:37:57PM +, Catalin Marinas wrote:
> > > > On Thu, Feb 25, 2021 at
On Thu, Mar 18, 2021 at 09:41:54AM +0100, Arnd Bergmann wrote:
> On Wed, Mar 17, 2021 at 5:18 PM Catalin Marinas
> wrote:
> >
> > On Wed, Mar 17, 2021 at 02:37:57PM +, Catalin Marinas wrote:
> > > On Thu, Feb 25, 2021 at 12:20:56PM +0100, Arnd Bergmann wrote:
> > > > diff --git
On Wed, Mar 17, 2021 at 5:18 PM Catalin Marinas wrote:
>
> On Wed, Mar 17, 2021 at 02:37:57PM +, Catalin Marinas wrote:
> > On Thu, Feb 25, 2021 at 12:20:56PM +0100, Arnd Bergmann wrote:
> > > diff --git a/arch/arm64/kernel/vmlinux.lds.S
> > > b/arch/arm64/kernel/vmlinux.lds.S
> > > index
On Wed, Mar 17, 2021 at 02:37:57PM +, Catalin Marinas wrote:
> On Thu, Feb 25, 2021 at 12:20:56PM +0100, Arnd Bergmann wrote:
> > diff --git a/arch/arm64/kernel/vmlinux.lds.S
> > b/arch/arm64/kernel/vmlinux.lds.S
> > index bad2b9eaab22..926cdb597a45 100644
> > ---
On Thu, Feb 25, 2021 at 12:20:56PM +0100, Arnd Bergmann wrote:
> diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
> index bad2b9eaab22..926cdb597a45 100644
> --- a/arch/arm64/kernel/vmlinux.lds.S
> +++ b/arch/arm64/kernel/vmlinux.lds.S
> @@ -217,7 +217,7 @@ SECTIONS
>
On 2021-03-10, Nicolas Pitre wrote:
On Mon, 1 Mar 2021, Nicholas Piggin wrote:
Excerpts from Arnd Bergmann's message of February 27, 2021 7:49 pm:
> Unlike what Nick expected in his submission, I now think the annotations
> will be needed for LTO just like they are for --gc-sections.
Yeah I
On 2021-03-10, Arnd Bergmann wrote:
On Wed, Mar 10, 2021 at 9:50 PM Masahiro Yamada wrote:
On Mon, Mar 1, 2021 at 10:11 AM Nicholas Piggin wrote:
> Excerpts from Arnd Bergmann's message of February 27, 2021 7:49 pm:
masahiro@oscar:~/ref/linux$ echo 'void this_func_is_unused(void) {}'
>>
On Wed, 10 Mar 2021, Nick Desaulniers wrote:
> On Wed, Mar 10, 2021 at 1:08 PM Arnd Bergmann wrote:
> >
> > On Wed, Mar 10, 2021 at 9:50 PM Masahiro Yamada
> > wrote:
> > > On Mon, Mar 1, 2021 at 10:11 AM Nicholas Piggin wrote:
> > > > Excerpts from Arnd Bergmann's message of February 27,
On Wed, Mar 10, 2021 at 1:08 PM Arnd Bergmann wrote:
>
> On Wed, Mar 10, 2021 at 9:50 PM Masahiro Yamada wrote:
> > On Mon, Mar 1, 2021 at 10:11 AM Nicholas Piggin wrote:
> > > Excerpts from Arnd Bergmann's message of February 27, 2021 7:49 pm:
>
> >
> > masahiro@oscar:~/ref/linux$ echo 'void
On Wed, Mar 10, 2021 at 10:47 PM Nicolas Pitre wrote:
...
> > With CONFIG_TRIM_UNUSED_KSYMS=y I see a 3x-loops of building .version
> > and folowing steps - got no answer if this is intended.
>
> Yes it is intended. I explained it here:
>
> https://lkml.org/lkml/2021/3/9/1099
>
Ah, cool.
Thanks
On Wed, 10 Mar 2021, Sedat Dilek wrote:
> The best results on size-reduction of vmlinux I got with Clang-CFI on x86-64.
>
> Clang-LTO and Clang-CFI:
> I was able to build with CONFIG_TRIM_UNUSED_KSYMS=y which needs to add
> a whitelist file or add a whitelist to scripts/gen_autoksyms.sh.
> And
On 10/03/2021 21.49, Masahiro Yamada wrote:
> On Mon, Mar 1, 2021 at 10:11 AM Nicholas Piggin wrote:
>
> I tested LD_DEAD_CODE_DATA_ELIMINATION for the latest kernel.
>
> I added an unused function, this_func_is_unused(),
> then built the ppc kernel with LD_DEAD_CODE_DATA_ELIMINATION.
>
> It
On Mon, 1 Mar 2021, Nicholas Piggin wrote:
> Excerpts from Arnd Bergmann's message of February 27, 2021 7:49 pm:
> > Unlike what Nick expected in his submission, I now think the annotations
> > will be needed for LTO just like they are for --gc-sections.
>
> Yeah I wasn't sure exactly what LTO
On Wed, Mar 10, 2021 at 10:08 PM Arnd Bergmann wrote:
>
> On Wed, Mar 10, 2021 at 9:50 PM Masahiro Yamada wrote:
> > On Mon, Mar 1, 2021 at 10:11 AM Nicholas Piggin wrote:
> > > Excerpts from Arnd Bergmann's message of February 27, 2021 7:49 pm:
>
> >
> > masahiro@oscar:~/ref/linux$ echo 'void
On Wed, Mar 10, 2021 at 9:50 PM Masahiro Yamada wrote:
> On Mon, Mar 1, 2021 at 10:11 AM Nicholas Piggin wrote:
> > Excerpts from Arnd Bergmann's message of February 27, 2021 7:49 pm:
>
> masahiro@oscar:~/ref/linux$ echo 'void this_func_is_unused(void) {}'
> >> kernel/cpu.c
>
On Mon, Mar 1, 2021 at 10:11 AM Nicholas Piggin wrote:
>
> Excerpts from Arnd Bergmann's message of February 27, 2021 7:49 pm:
> > On Fri, Feb 26, 2021 at 10:13 PM 'Fangrui Song' via Clang Built Linux
> > wrote:
> >>
> >> For folks who are interested in --gc-sections on metadata sections,
> >> I
Excerpts from Arnd Bergmann's message of February 27, 2021 7:49 pm:
> On Fri, Feb 26, 2021 at 10:13 PM 'Fangrui Song' via Clang Built Linux
> wrote:
>>
>> For folks who are interested in --gc-sections on metadata sections,
>> I want to bring you awareness of the implication of __start_/__stop_
On Fri, Feb 26, 2021 at 10:13 PM 'Fangrui Song' via Clang Built Linux
wrote:
>
> For folks who are interested in --gc-sections on metadata sections,
> I want to bring you awareness of the implication of __start_/__stop_ symbols
> and C identifier name sections.
> You can see
On 2021-02-25, Arnd Bergmann wrote:
From: Arnd Bergmann
When looking at kernel size optimizations, I found that arm64
does not currently support HAVE_LD_DEAD_CODE_DATA_ELIMINATION,
which enables the --gc-sections flag to the linker.
I see that for a defconfig build with llvm, there are some
On Fri, Feb 26, 2021 at 10:51 AM Arnd Bergmann wrote:
>
> On Fri, Feb 26, 2021 at 10:05 AM Sedat Dilek wrote:
> > On Fri, Feb 26, 2021 at 9:14 AM Arnd Bergmann wrote:
> >
> > > > BTW, is CONFIG_LD_DEAD_CODE_DATA_ELIMINATION=y setable for x86 (64bit)?
> > > > ( Did not look or check for it. )
>
On Fri, Feb 26, 2021 at 10:05 AM Sedat Dilek wrote:
> On Fri, Feb 26, 2021 at 9:14 AM Arnd Bergmann wrote:
>
> > > BTW, is CONFIG_LD_DEAD_CODE_DATA_ELIMINATION=y setable for x86 (64bit)?
> > > ( Did not look or check for it. )
> >
> > No, in mainline, HAVE_LD_DEAD_CODE_DATA_ELIMINATION is
On Fri, Feb 26, 2021 at 9:14 AM Arnd Bergmann wrote:
>
> On Fri, Feb 26, 2021 at 1:36 AM Sedat Dilek wrote:
> >
> > On Thu, Feb 25, 2021 at 12:21 PM Arnd Bergmann wrote:
> > >
> > > From: Arnd Bergmann
> > >
> > > When looking at kernel size optimizations, I found that arm64
> > > does not
On Fri, Feb 26, 2021 at 1:36 AM Sedat Dilek wrote:
>
> On Thu, Feb 25, 2021 at 12:21 PM Arnd Bergmann wrote:
> >
> > From: Arnd Bergmann
> >
> > When looking at kernel size optimizations, I found that arm64
> > does not currently support HAVE_LD_DEAD_CODE_DATA_ELIMINATION,
> > which enables the
On Thu, Feb 25, 2021 at 12:21 PM Arnd Bergmann wrote:
>
> From: Arnd Bergmann
>
> When looking at kernel size optimizations, I found that arm64
> does not currently support HAVE_LD_DEAD_CODE_DATA_ELIMINATION,
> which enables the --gc-sections flag to the linker.
>
> I see that for a defconfig
On Thu, Feb 25, 2021 at 12:20:56PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann
>
> When looking at kernel size optimizations, I found that arm64
> does not currently support HAVE_LD_DEAD_CODE_DATA_ELIMINATION,
> which enables the --gc-sections flag to the linker.
>
> I see that for a
From: Arnd Bergmann
When looking at kernel size optimizations, I found that arm64
does not currently support HAVE_LD_DEAD_CODE_DATA_ELIMINATION,
which enables the --gc-sections flag to the linker.
I see that for a defconfig build with llvm, there are some
notable improvements from enabling
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