On Wed, Apr 7, 2021 at 2:22 PM Kees Cook wrote:
>
> On Wed, Apr 07, 2021 at 02:17:04PM -0700, 'Bill Wendling' via Clang Built
> Linux wrote:
> > From: Sami Tolvanen
> >
> > Enable the use of clang's Profile-Guided Optimization[1]. To generate a
> > profile, the kernel is instrumented with PGO
On Sat, Mar 6, 2021 at 10:25 PM Segher Boessenkool
wrote:
>
> Hi!
>
> On Sat, Mar 06, 2021 at 09:14:33PM -0800, Fangrui Song wrote:
> > TOC relocations are like GOT relocations on other architectures.
> > However, unlike other architectures, GNU ld's ppc64 port defines .TOC.
> > relative to the
On Wed, Mar 3, 2021 at 3:07 PM Fangrui Song wrote:
>
>
> On 2021-03-03, Masahiro Yamada wrote:
> >Hi.
> >
> >On Wed, Mar 3, 2021 at 6:44 AM Fangrui Song wrote:
> >>
> >> Reviewed-by: Fangrui Song
> >>
> >> Thanks for the clean-up!
> >> --gcc-toolchain= is an obsscure way searching for GCC
On Fri, Feb 5, 2021 at 11:21 AM Sedat Dilek wrote:
>
> On Fri, Feb 5, 2021 at 8:15 PM Sedat Dilek wrote:
> >
> > On Fri, Feb 5, 2021 at 8:10 PM Yonghong Song wrote:
> > >
> > >
> > >
> > > On 2/5/21 11:06 AM, Sedat Dilek wrote:
> > > > On Fri, Feb 5, 2021 at 7:53 PM Sedat Dilek
> > > > wrote:
On Sat, Jan 30, 2021 at 3:10 PM Sedat Dilek wrote:
>
> On Sat, Jan 30, 2021 at 1:44 AM Nick Desaulniers
> wrote:
> >
> > DWARF v5 is the latest standard of the DWARF debug info format.
> >
> > Feature detection of DWARF5 is onerous, especially given that we've
> > removed $(AS), so we must query
On Fri, Jan 29, 2021 at 4:46 PM 'Nick Desaulniers' via Clang Built
Linux wrote:
>
> On Fri, Jan 29, 2021 at 4:08 PM Sedat Dilek wrote:
> >
> > On Fri, Jan 29, 2021 at 8:43 PM Nick Desaulniers
> > wrote:
> > >
> > > DWARF v5 is the latest standard of the DWARF debug info format.
> > >
> > >
On Fri, Jan 22, 2021 at 12:13 PM Aditya wrote:
>
> On 23/1/21 12:40 am, Joe Perches wrote:
> > On Fri, 2021-01-22 at 18:48 +0530, Aditya wrote:
> >> On 21/1/21 12:13 am, Joe Perches wrote:
> >>> I believe the test should be:
> >>>
> >>> if ($realfile =~ /\.S$/ &&
> >>> $line =~
> >>>
On Thu, Jan 14, 2021 at 2:48 PM Fangrui Song wrote:
>
> This is similar to commit b21ebf2fb4cd ("x86: Treat R_X86_64_PLT32 as
> R_X86_64_PC32"), but for i386. As far as Linux kernel is concerned,
> R_386_PLT32 can be treated the same as R_386_PC32.
>
> R_386_PC32/R_X86_64_PC32 are PC-relative
On Thu, Jan 14, 2021 at 11:04 PM Marco Elver wrote:
>
> On Thu, 14 Jan 2021 at 22:54, Fangrui Song wrote:
> > clang-12 -fno-pic (since
> > https://github.com/llvm/llvm-project/commit/a084c0388e2a59b9556f2de008232da3f1d6)
> > can emit `call __stack_chk_fail@PLT` instead of `call
On Thu, Jan 14, 2021 at 6:06 AM Jessica Yu wrote:
>
> +++ Fangrui Song [13/01/21 21:48 -0800]:
> >clang-12 -fno-pic (since
> >https://github.com/llvm/llvm-project/commit/a084c0388e2a59b9556f2de008232da3f1d6)
> >can emit `call __stack_chk_fail@PLT` instead of `call __stack_chk_fail`
> >on x86.
On Tue, Jan 12, 2021 at 9:37 AM 'Nick Desaulniers' via Clang Built
Linux wrote:
>
> On Mon, Jan 11, 2021 at 9:14 PM Bill Wendling wrote:
> >
> > From: Sami Tolvanen
> >
> > Enable the use of clang's Profile-Guided Optimization[1]. To generate a
> > profile, the kernel is instrumented with PGO
On Mon, Jan 11, 2021 at 4:38 PM Bill Wendling wrote:
>
> On Mon, Jan 11, 2021 at 12:31 PM Fangrui Song wrote:
> > On 2021-01-11, Bill Wendling wrote:
> > >On Mon, Jan 11, 2021 at 12:12 PM Fangrui Song wrote:
> > >>
> > >> On 2021-01-11, 'Bill Wendling' via Clang Built Linux wrote:
> > >> >From:
On Mon, Jan 11, 2021 at 4:38 PM Borislav Petkov wrote:
>
> On Mon, Jan 11, 2021 at 12:38:06PM -0800, Nick Desaulniers wrote:
> > Arnd found a randconfig that produces the warning:
> >
> > arch/x86/entry/thunk_64.o: warning: objtool: missing symbol for insn at
> > offset 0x3e
> >
> > when building
On Mon, Jan 11, 2021 at 2:09 PM Josh Poimboeuf wrote:
>
> On Mon, Jan 11, 2021 at 12:58:14PM -0800, Fangrui Song wrote:
> > On 2021-01-11, Nick Desaulniers wrote:
> > > Arnd found a randconfig that produces the warning:
> > >
> > > arch/x86/entry/thunk_64.o: warning: objtool: missing symbol for
On Wed, Jan 6, 2021 at 2:07 PM Kees Cook wrote:
>
> On Wed, Jan 06, 2021 at 08:08:19PM +, Alexander Lobakin wrote:
> > Discard GNU attributes at link time as kernel doesn't use it at all.
> > Solves a dozen of the following ld warnings (one per every file):
> >
> > mips-alpine-linux-musl-ld:
On Wed, Jan 6, 2021 at 12:08 PM Alexander Lobakin wrote:
>
> Catch any symbols placed in .got, .got.plt, .plt, .rel.dyn
> or .rela.dyn and check for these sections to be zero-sized
> at link time.
>
> At least two of them were noticed in real builds:
>
> mips-alpine-linux-musl-ld: warning: orphan
On Mon, Jan 4, 2021 at 4:21 AM Alexander Lobakin wrote:
>
> GCC somehow manages to place some of the symbols from main.c into
> .rel.dyn section:
>
> mips-alpine-linux-musl-ld: warning: orphan section `.rel.dyn'
> from `init/main.o' being placed in section `.rel.dyn'
>
> I couldn't catch up the
On Tue, Dec 8, 2020 at 1:02 PM Arnd Bergmann wrote:
>
> On Tue, Dec 8, 2020 at 9:59 PM Arnd Bergmann wrote:
> >
> > Attaching the config for "ld.lld: error: Never resolved function from
> > blockaddress (Producer: 'LLVM12.0.0' Reader: 'LLVM 12.0.0')"
>
> And here is a new one: "ld.lld: error:
On 2020-12-01, Segher Boessenkool wrote:
On Tue, Dec 01, 2020 at 12:38:16PM +0900, Masahiro Yamada wrote:
> We can bump -Wa,-gdwarf-2 to -Wa,-gdwarf-3 since GNU actually emits
> DWARF v3 DW_AT_ranges (see
> https://sourceware.org/bugzilla/show_bug.cgi?id=26850 )
> This can avoid the `warning:
On Mon, Nov 30, 2020 at 10:05 AM Masahiro Yamada wrote:
>
> On Wed, Nov 4, 2020 at 9:53 AM 'Nick Desaulniers' via Clang Built
> Linux wrote:
> >
> > Modifies CONFIG_DEBUG_INFO_DWARF4 to be a member of a choice. Adds an
> > explicit CONFIG_DEBUG_INFO_DWARF2, which is the default. Does so in a
> >
On Mon, Nov 30, 2020 at 10:34 AM Yu, Yu-cheng wrote:
>
> On 11/30/2020 10:26 AM, Nick Desaulniers wrote:
> > (In response to
> > https://lore.kernel.org/lkml/20201110162211.9207-2-yu-cheng...@intel.com/)
> >
> >> These need to be enabled to build a CET-enabled kernel, and Binutils v2.31
> >> and
On Fri, Nov 13, 2020 at 4:23 PM Segher Boessenkool
wrote:
>
> On Fri, Nov 13, 2020 at 12:14:18PM -0800, Nick Desaulniers wrote:
> > > > > Error: invalid switch -me200
> > > > > Error: unrecognized option -me200
> > > >
> > > > 251 cpu-as-$(CONFIG_E200) += -Wa,-me200
> > > >
> > > > Are those
On Thu, Nov 12, 2020 at 7:22 PM kernel test robot wrote:
>
> Hi Fangrui,
>
> FYI, the error/warning still remains.
>
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> master
> head: 585e5b17b92dead8a3aca4e3c9876fbca5f7e0ba
> commit:
On Wed, Oct 21, 2020 at 1:09 PM Kees Cook wrote:
>
> On Wed, Oct 14, 2020 at 09:53:39PM -0700, Fāng-ruì Sòng wrote:
> > On Wed, Oct 14, 2020 at 4:04 PM Kees Cook wrote:
> > > > index 5430febd34be..b83c00c63997 100644
> > > > --- a/include/asm-generic/vml
On Wed, Oct 14, 2020 at 4:04 PM Kees Cook wrote:
>
> On Sun, Oct 04, 2020 at 07:57:20PM -0700, Kees Cook wrote:
> > Under some circumstances, the compiler generates .ctors.* sections. This
> > is seen doing a cross compile of x86_64 from a powerpc64el host:
> >
> > x86_64-linux-gnu-ld: warning:
On Mon, Oct 12, 2020 at 2:11 PM 'Nick Desaulniers' via Clang Built
Linux wrote:
>
> On Mon, Sep 28, 2020 at 3:49 PM Nathan Chancellor
> wrote:
> >
> > After turning on warnings for orphan section placement, enabling
> > CONFIG_UNWINDER_FRAME_POINTER instead of CONFIG_UNWINDER_ARM causes
> >
On 2020-08-03, Andi Kleen wrote:
Why is that? Both .text and .text.hot have alignment of 2^4 (default
function alignment on x86) by default, so it doesn't seem like it should
matter for packing density. Avoiding interspersing cold text among
You may lose part of a cache line on each unit
On 2020-08-03, Arvind Sankar wrote:
On Mon, Aug 03, 2020 at 12:05:06PM -0700, Andi Kleen wrote:
> However, the history of their being together comes from
>
> 9bebe9e5b0f3 ("kbuild: Fix .text.unlikely placement")
>
> which seems to indicate there was some problem with having them separated
On 2020-06-22, Nick Desaulniers wrote:
On Wed, Jun 17, 2020 at 2:27 PM Fāng-ruì Sòng wrote:
On 2020-06-17, Nick Desaulniers wrote:
>ld.bfd's internal linker script considers .text.hot AND .text.hot.* to
>be part of .text, as well as .text.unlikely and .text.unlikely.*.
>ld.lld wil
On Mon, Jun 22, 2020 at 3:57 PM Kees Cook wrote:
>
> On Mon, Jun 22, 2020 at 03:52:37PM -0700, Fangrui Song wrote:
> > > And it's not in the output:
> > >
> > > $ readelf -Vs arch/x86/boot/compressed/vmlinux | grep version
> > > No version information found in this file.
> > >
> > > So... for the
-gdb.git;a=commitdiff;h=1de778ed23ce7492c523d5850c6c6dbb34152655
Link: https://reviews.llvm.org/D79600
Reported-by: Jian Cai
Debugged-by: Luis Lozano
Suggested-by: Fāng-ruì Sòng
Tested-by: Luis Lozano
Tested-by: Manoj Gupta
Signed-off-by: Nick Desaulniers
---
include/asm-generic/vmlinux.lds.h | 4
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