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Any comments on this patch? The addition LTO .notes information emitted by kernel is used by pahole in the following patch: https://lore.kernel.org/bpf/20210401025825.2254746-1-yhs@fb.com/ (dwarf_loader: check .notes section for lto build info) Thanks, Yonghong On 4/6/21 12:05 AM, Sedat Dilek wrote: > On Fri, Apr 2, 2021 at 8:07 PM 'Nick Desaulniers' via Clang Built > Linux wrote: >> >> On Thu, Apr 1, 2021 at 4:27 PM Yonghong Song wrote: >>> >>> Currently, clang LTO built vmlinux won't work with pahole. >>> LTO introduced cross-cu dwarf tag references and broke >>> current pahole model which handles one cu as a time. >>> The solution is to merge all cu's as one pahole cu as in [1]. >>> We would like to do this merging only if cross-cu dwarf >>> references happens. The LTO build mode is a pretty good >>> indication for that. >>> >>> In earlier version of this patch ([2]), clang flag >>> -grecord-gcc-switches is proposed to add to compilation flags >>> so pahole could detect "-flto" and then merging cu's. >>> This will increate the binary size of 1% without LTO though. >>> >>> Arnaldo suggested to use a note to indicate the vmlinux >>> is built with LTO. Such a cheap way to get whether the vmlinux >>> is built with LTO or not helps pahole but is also useful >>> for tracing as LTO may inline/delete/demote global functions, >>> promote static functions, etc. >>> >>> So this patch added an elfnote with a new type LINUX_ELFNOTE_LTO_INFO. >>> The owner of the note is "Linux". >>> >>> With gcc 8.4.1 and clang trunk, without LTO, I got >>> $ readelf -n vmlinux >>> Displaying notes found in: .notes >>> Owner Data size Description >>> ... >>> Linux 0x00000004 func >>> description data: 00 00 00 00 >>> ... >>> With "readelf -x ".notes" vmlinux", I can verify the above "func" >>> with type code 0x101. >>> >>> With clang thin-LTO, I got the same as above except the following: >>> description data: 01 00 00 00 >>> which indicates the vmlinux is built with LTO. >>> >>> [1] https://lore.kernel.org/bpf/20210325065316.3121287-1-yhs@fb.com/ >>> [2] https://lore.kernel.org/bpf/20210331001623.2778934-1-yhs@fb.com/ >>> >>> Suggested-by: Arnaldo Carvalho de Melo >>> Signed-off-by: Yonghong Song >> >> LGTM thanks Yonghong! >> Reviewed-by: Nick Desaulniers >> > > Thanks for the patch. > > Feel free to add: > > Tested-by: Sedat Dilek # LLVM/Clang v12.0.0-rc4 (x86-64) > > As a note for the pahole side: > Recent patches require an adaptation of the define and its comment. > > 1. LINUX_ELFNOTE_BUILD_LTO -> LINUX_ELFNOTE_LTO_INFO > 2. include/linux/elfnote.h -> include/linux/elfnote-lto.h > > - Sedat - > >>> --- >>> include/linux/elfnote-lto.h | 14 ++++++++++++++ >>> init/version.c | 2 ++ >>> scripts/mod/modpost.c | 2 ++ >>> 3 files changed, 18 insertions(+) >>> create mode 100644 include/linux/elfnote-lto.h >>> >>> Changelogs: >>> v3 -> v4: >>> . put new lto note in its own header file similar to >>> build-salt.h. (Nick) >>> v2 -> v3: >>> . abandoned the approach of adding -grecord-gcc-switches, >>> instead create a note to indicate whether it is a lto build >>> or not. The note definition is in compiler.h. (Arnaldo) >>> v1 -> v2: >>> . limited to add -grecord-gcc-switches for LTO_CLANG >>> instead of all clang build >>> >>> diff --git a/include/linux/elfnote-lto.h b/include/linux/elfnote-lto.h >>> new file mode 100644 >>> index 000000000000..d4635a3ecc4f >>> --- /dev/null >>> +++ b/include/linux/elfnote-lto.h >>> @@ -0,0 +1,14 @@ >>> +#ifndef __ELFNOTE_LTO_H >>> +#define __ELFNOTE_LTO_H >>> + >>> +#include >>> + >>> +#define LINUX_ELFNOTE_LTO_INFO 0x101 >>> + >>> +#ifdef CONFIG_LTO >>> +#define BUILD_LTO_INFO ELFNOTE32("Linux", LINUX_ELFNOTE_LTO_INFO, 1) >>> +#else >>> +#define BUILD_LTO_INFO ELFNOTE32("Linux", LINUX_ELFNOTE_LTO_INFO, 0) >>> +#endif >>> + >>> +#endif /* __ELFNOTE_LTO_H */ >>> diff --git a/init/version.c b/init/version.c >>> index 92afc782b043..1a356f5493e8 100644 >>> --- a/init/version.c >>> +++ b/init/version.c >>> @@ -9,6 +9,7 @@ >>> >>> #include >>> #include >>> +#include >>> #include >>> #include >>> #include >>> @@ -45,3 +46,4 @@ const char linux_proc_banner[] = >>> " (" LINUX_COMPILER ") %s\n"; >>> >>> BUILD_SALT; >>> +BUILD_LTO_INFO; >>> diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c >>> index 24725e50c7b4..98fb2bb024db 100644 >>> --- a/scripts/mod/modpost.c >>> +++ b/scripts/mod/modpost.c >>> @@ -2191,10 +2191,12 @@ static void add_header(struct buffer *b, struct module *mod) >>> */ >>> buf_printf(b, "#define INCLUDE_VERMAGIC\n"); >>> buf_printf(b, "#include \n"); >>> + buf_printf(b, "#include \n"); >>> buf_printf(b, "#include \n"); >>> buf_printf(b, "#include \n"); >>> buf_printf(b, "\n"); >>> buf_printf(b, "BUILD_SALT;\n"); >>> + buf_printf(b, "BUILD_LTO_INFO;\n"); >>> buf_printf(b, "\n"); >>> buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); >>> buf_printf(b, "MODULE_INFO(name, KBUILD_MODNAME);\n"); >>> -- >>> 2.30.2 >>> >> >> >> -- >> Thanks, >> ~Nick Desaulniers >> >> -- >> You received this message because you are subscribed to the Google Groups "Clang Built Linux" group. >> To unsubscribe from this group and stop receiving emails from it, send an email to clang-built-linux+unsubscribe@googlegroups.com. >> To view this discussion on the web visit https://groups.google.com/d/msgid/clang-built-linux/CAKwvOdmX8d3XTzJFk5rN_PnOQYJ8bXMrh8DrhzqN=UBNdQiO3g@mail.gmail.com .