From nobody Mon Nov 25 16:50:48 2024 Received: from mail-yw1-f202.google.com (mail-yw1-f202.google.com [209.85.128.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 769B51B6D05 for ; Sat, 26 Oct 2024 05:14:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729919672; cv=none; b=rPbl1KT9FNHHOtdS+v0nAZgGGtMhCekSvCpfcbH4dhjMtHWpuI17GqsVnejCT6kqB7Xeya9/ou19IaUOzeyBxB9NtOS1UjYYlPUyCHnkZOvyF9S9/zdK5xCXBhKhW+Gl7j6La8C9At3c4MEkP6IJ1s7/4KEQ29zUj14YfNu66WY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729919672; c=relaxed/simple; bh=OxUTYZTe1n0vhKThzNBny79kH0JDR/KA1djRFj4e/mo=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=RgOOg7ZeEon4IdRAzRiIPCGFse7dt53kanAezHb8NotH9ROlDcmq2Nb0yDbRyrGk9SUrL7J8w//sK0DHSzpU0+77Yy64bui7inxnPjO5mOWUU6bQa1JpYtI93DAEdoUYSAuLY7qpWLxPhxxvS0weTGFy7KDom71XSvngV6DvvJ4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--xur.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=cDUILVaN; arc=none smtp.client-ip=209.85.128.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--xur.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="cDUILVaN" Received: by mail-yw1-f202.google.com with SMTP id 00721157ae682-6e321d26b38so45382007b3.2 for ; Fri, 25 Oct 2024 22:14:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1729919667; x=1730524467; darn=vger.kernel.org; h=content-transfer-encoding:cc:to:from:subject:message-id:references :mime-version:in-reply-to:date:from:to:cc:subject:date:message-id :reply-to; bh=xDdrVxZlAl9QijPKkCvbHhOZkYD0EQJOeXDjyDyv7o8=; b=cDUILVaNI6LcyBXEmT31makI4Vbx2W6Zn5G935YyQxqRd/BvTGQJveypOZi7mP/MRZ UkC7lM2Dk0innNpfWeRR3F8RsOp/NpmebbMGSgcI21BRkZipDXlLBNZ/ECHUiCJChwVa WrKIadLTrWTsaFblBWoO7rThvKd21WjLffMA3kImfTMk0TJQnZqjRD1mObRWV5UBny0s YbWa4KQ76dyuC2/2dZknc94sep3QxDacZvs7/0O3fQdMCOuTM/RPZtR83amFR5IrLOvh qm1J24sqeYdfzWR5Ger4CUHTmNTjG0aLb1bnuguQBgnw0xJOhuAPgnn27ebd6uQupULJ kyig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1729919667; x=1730524467; h=content-transfer-encoding:cc:to:from:subject:message-id:references :mime-version:in-reply-to:date:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to; bh=xDdrVxZlAl9QijPKkCvbHhOZkYD0EQJOeXDjyDyv7o8=; b=tOc/UIGTv7NffP1dO710b8SJItCcsM8ugGVjRVnHEMywmsbhVJcqJS8oK1fgeMMBzn XL/ByRY2PfNHDPUHZXGHNRcShdnfjGxn3U+AIzpQSIpg25cXwFH2+rMXRanvumt33SP2 De03rN5z2NXN5dpswM6bycJMVIi14wJn6cSUzTxG734Qor+e1rNwINm9KuN3pAZ7Jtdv tDVhLU/yBkhY9AxqD0l0eL6nl8cVVFOxbkcpeKLtjPhfsfcBs6vhz91OgU3+ock/556J H/XZ9SBwBWDdzjWohqHgW+ZZt+L2yoOn4ZYbwFJg+ZiPC4vrWIrHBnTribZ2CIRwHBaN 51Lw== X-Forwarded-Encrypted: i=1; AJvYcCUznRaDAzAaDLvPA8I3OT7W6pozMOkgyW2HnUXqQBaeCpX06WEGe2115iBeyxO9trEK52I2hd4VrPDScRg=@vger.kernel.org X-Gm-Message-State: AOJu0YwXVFOsGZZ4JWF6cfkGOpyRPUvFddwQjhQtKWbZbqCWu9x2m0RL NrR+/rq/nODU+CQzF+GzrXWYHbZGLjld6S0XOcparOYWG1vytcrpUSHedztcX/zeAQ== X-Google-Smtp-Source: AGHT+IG6zdqc8OsAUGdjyK2cI4IrHfRKXPRvXl3/+lYmGBRNukyJL3JwAXkBPknaO+2gam+lIMZus8Q= X-Received: from xur.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:2330]) (user=xur job=sendgmr) by 2002:a25:ef0f:0:b0:e2b:cd55:11b3 with SMTP id 3f1490d57ef6-e3087b69b61mr1268276.5.1729919666892; Fri, 25 Oct 2024 22:14:26 -0700 (PDT) Date: Fri, 25 Oct 2024 22:14:09 -0700 In-Reply-To: <20241026051410.2819338-1-xur@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241026051410.2819338-1-xur@google.com> X-Mailer: git-send-email 2.47.0.163.g1226f6d8fa-goog Message-ID: <20241026051410.2819338-8-xur@google.com> Subject: [PATCH v6 7/7] Add Propeller configuration for kernel build From: Rong Xu To: Alice Ryhl , Andrew Morton , Arnd Bergmann , Bill Wendling , Borislav Petkov , Breno Leitao , Brian Gerst , Dave Hansen , David Li , Han Shen , Heiko Carstens , "H. Peter Anvin" , Ingo Molnar , Jann Horn , Jonathan Corbet , Josh Poimboeuf , Juergen Gross , Justin Stitt , Kees Cook , Masahiro Yamada , "Mike Rapoport (IBM)" , Nathan Chancellor , Nick Desaulniers , Nicolas Schier , "Paul E. McKenney" , Peter Zijlstra , Rong Xu , Sami Tolvanen , Thomas Gleixner , Wei Yang , workflows@vger.kernel.org, Miguel Ojeda , Maksim Panchenko , "David S. Miller" , Andreas Larsson , Yonghong Song , Yabin Cui , Krzysztof Pszeniczny , Sriraman Tallam , Stephane Eranian Cc: x86@kernel.org, linux-arch@vger.kernel.org, sparclinux@vger.kernel.org, linux-doc@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add the build support for using Clang's Propeller optimizer. Like AutoFDO, Propeller uses hardware sampling to gather information about the frequency of execution of different code paths within a binary. This information is then used to guide the compiler's optimization decisions, resulting in a more efficient binary. The support requires a Clang compiler LLVM 19 or later, and the create_llvm_prof tool (https://github.com/google/autofdo/releases/tag/v0.30.1). This commit is limited to x86 platforms that support PMU features like LBR on Intel machines and AMD Zen3 BRS. Here is an example workflow for building an AutoFDO+Propeller optimized kernel: 1) Build the kernel on the host machine, with AutoFDO and Propeller build config CONFIG_AUTOFDO_CLANG=3Dy CONFIG_PROPELLER_CLANG=3Dy then $ make LLVM=3D1 CLANG_AUTOFDO_PROFILE=3D =E2=80=9C=E2=80=9D is the profile collected when doing a n= on-Propeller AutoFDO build. This step builds a kernel that has the same optimization level as AutoFDO, plus a metadata section that records basic block information. This kernel image runs as fast as an AutoFDO optimized kernel. 2) Install the kernel on test/production machines. 3) Run the load tests. The '-c' option in perf specifies the sample event period. We suggest using a suitable prime number, like 500009, for this purpose. For Intel platforms: $ perf record -e BR_INST_RETIRED.NEAR_TAKEN:k -a -N -b -c \ -o -- For AMD platforms: The supported system are: Zen3 with BRS, or Zen4 with amd_lbr_v2 # To see if Zen3 support LBR: $ cat proc/cpuinfo | grep " brs" # To see if Zen4 support LBR: $ cat proc/cpuinfo | grep amd_lbr_v2 # If the result is yes, then collect the profile using: $ perf record --pfm-events RETIRED_TAKEN_BRANCH_INSTRUCTIONS:k -a \ -N -b -c -o -- 4) (Optional) Download the raw perf file to the host machine. 5) Generate Propeller profile: $ create_llvm_prof --binary=3D --profile=3D \ --format=3Dpropeller --propeller_output_module_name \ --out=3D_cc_profile.txt \ --propeller_symorder=3D_ld_profile.txt =E2=80=9Ccreate_llvm_prof=E2=80=9D is the profile conversion tool, and a= prebuilt binary for linux can be found on https://github.com/google/autofdo/releases/tag/v0.30.1 (can also build from source). "" can be something like "/home/user/dir/any_string". This command generates a pair of Propeller profiles: "_cc_profile.txt" and "_ld_profile.txt". 6) Rebuild the kernel using the AutoFDO and Propeller profile files. CONFIG_AUTOFDO_CLANG=3Dy CONFIG_PROPELLER_CLANG=3Dy and $ make LLVM=3D1 CLANG_AUTOFDO_PROFILE=3D \ CLANG_PROPELLER_PROFILE_PREFIX=3D Co-developed-by: Han Shen Signed-off-by: Han Shen Signed-off-by: Rong Xu Suggested-by: Sriraman Tallam Suggested-by: Krzysztof Pszeniczny Suggested-by: Nick Desaulniers Suggested-by: Stephane Eranian Tested-by: Yonghong Song Reviewed-by: Kees Cook --- Documentation/dev-tools/index.rst | 1 + Documentation/dev-tools/propeller.rst | 162 ++++++++++++++++++++++++++ MAINTAINERS | 7 ++ Makefile | 1 + arch/Kconfig | 19 +++ arch/x86/Kconfig | 1 + arch/x86/kernel/vmlinux.lds.S | 4 + include/asm-generic/vmlinux.lds.h | 6 +- scripts/Makefile.lib | 10 ++ scripts/Makefile.propeller | 28 +++++ tools/objtool/check.c | 1 + 11 files changed, 237 insertions(+), 3 deletions(-) create mode 100644 Documentation/dev-tools/propeller.rst create mode 100644 scripts/Makefile.propeller diff --git a/Documentation/dev-tools/index.rst b/Documentation/dev-tools/in= dex.rst index 6945644f7008a..3c0ac08b27091 100644 --- a/Documentation/dev-tools/index.rst +++ b/Documentation/dev-tools/index.rst @@ -35,6 +35,7 @@ Documentation/dev-tools/testing-overview.rst checkuapi gpio-sloppy-logic-analyzer autofdo + propeller =20 =20 .. only:: subproject and html diff --git a/Documentation/dev-tools/propeller.rst b/Documentation/dev-tool= s/propeller.rst new file mode 100644 index 0000000000000..92195958e3dbc --- /dev/null +++ b/Documentation/dev-tools/propeller.rst @@ -0,0 +1,162 @@ +.. SPDX-License-Identifier: GPL-2.0 + +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D +Using Propeller with the Linux kernel +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +This enables Propeller build support for the kernel when using Clang +compiler. Propeller is a profile-guided optimization (PGO) method used +to optimize binary executables. Like AutoFDO, it utilizes hardware +sampling to gather information about the frequency of execution of +different code paths within a binary. Unlike AutoFDO, this information +is then used right before linking phase to optimize (among others) +block layout within and across functions. + +A few important notes about adopting Propeller optimization: + +#. Although it can be used as a standalone optimization step, it is + strongly recommended to apply Propeller on top of AutoFDO, + AutoFDO+ThinLTO or Instrument FDO. The rest of this document + assumes this paradigm. + +#. Propeller uses another round of profiling on top of + AutoFDO/AutoFDO+ThinLTO/iFDO. The whole build process involves + "build-afdo - train-afdo - build-propeller - train-propeller - + build-optimized". + +#. Propeller requires LLVM 19 release or later for Clang/Clang++ + and the linker(ld.lld). + +#. In addition to LLVM toolchain, Propeller requires a profiling + conversion tool: https://github.com/google/autofdo with a release + after v0.30.1: https://github.com/google/autofdo/releases/tag/v0.30.1. + +The Propeller optimization process involves the following steps: + +#. Initial building: Build the AutoFDO or AutoFDO+ThinLTO binary as + you would normally do, but with a set of compile-time / link-time + flags, so that a special metadata section is created within the + kernel binary. The special section is only intend to be used by the + profiling tool, it is not part of the runtime image, nor does it + change kernel run time text sections. + +#. Profiling: The above kernel is then run with a representative + workload to gather execution frequency data. This data is collected + using hardware sampling, via perf. Propeller is most effective on + platforms supporting advanced PMU features like LBR on Intel + machines. This step is the same as profiling the kernel for AutoFDO + (the exact perf parameters can be different). + +#. Propeller profile generation: Perf output file is converted to a + pair of Propeller profiles via an offline tool. + +#. Optimized build: Build the AutoFDO or AutoFDO+ThinLTO optimized + binary as you would normally do, but with a compile-time / + link-time flag to pick up the Propeller compile time and link time + profiles. This build step uses 3 profiles - the AutoFDO profile, + the Propeller compile-time profile and the Propeller link-time + profile. + +#. Deployment: The optimized kernel binary is deployed and used + in production environments, providing improved performance + and reduced latency. + +Preparation +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +Configure the kernel with:: + + CONFIG_AUTOFDO_CLANG=3Dy + CONFIG_PROPELLER_CLANG=3Dy + +Customization +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +The default CONFIG_PROPELLER_CLANG setting covers kernel space objects +for Propeller builds. One can, however, enable or disable Propeller build +for individual files and directories by adding a line similar to the +following to the respective kernel Makefile: + +- For enabling a single file (e.g. foo.o):: + + PROPELLER_PROFILE_foo.o :=3D y + +- For enabling all files in one directory:: + + PROPELLER_PROFILE :=3D y + +- For disabling one file:: + + PROPELLER_PROFILE_foo.o :=3D n + +- For disabling all files in one directory:: + + PROPELLER__PROFILE :=3D n + + +Workflow +=3D=3D=3D=3D=3D=3D=3D=3D + +Here is an example workflow for building an AutoFDO+Propeller kernel: + +1) Assuming an AutoFDO profile is already collected following + instructions in the AutoFDO document, build the kernel on the host + machine, with AutoFDO and Propeller build configs :: + + CONFIG_AUTOFDO_CLANG=3Dy + CONFIG_PROPELLER_CLANG=3Dy + + and :: + + $ make LLVM=3D1 CLANG_AUTOFDO_PROFILE=3D + +2) Install the kernel on the test machine. + +3) Run the load tests. The '-c' option in perf specifies the sample + event period. We suggest using a suitable prime number, like 500009, + for this purpose. + + - For Intel platforms:: + + $ perf record -e BR_INST_RETIRED.NEAR_TAKEN:k -a -N -b -c -o= -- + + - For AMD platforms:: + + $ perf record --pfm-event RETIRED_TAKEN_BRANCH_INSTRUCTIONS:k -a -N = -b -c -o -- + + Note you can repeat the above steps to collect multiple s. + +4) (Optional) Download the raw perf file(s) to the host machine. + +5) Use the create_llvm_prof tool (https://github.com/google/autofdo) to + generate Propeller profile. :: + + $ create_llvm_prof --binary=3D --profile=3D + --format=3Dpropeller --propeller_output_module_na= me + --out=3D_cc_profile.txt + --propeller_symorder=3D= _ld_profile.txt + + "" can be something like "/home/user/dir/any_= string". + + This command generates a pair of Propeller profiles: + "_cc_profile.txt" and + "_ld_profile.txt". + + If there are more than 1 perf_file collected in the previous step, + you can create a temp list file "" with each line + containing one perf file name and run:: + + $ create_llvm_prof --binary=3D --profile=3D@ + --format=3Dpropeller --propeller_output_module_na= me + --out=3D_cc_profile.txt + --propeller_symorder=3D= _ld_profile.txt + +6) Rebuild the kernel using the AutoFDO and Propeller + profiles. :: + + CONFIG_AUTOFDO_CLANG=3Dy + CONFIG_PROPELLER_CLANG=3Dy + + and :: + + $ make LLVM=3D1 CLANG_AUTOFDO_PROFILE=3D CLANG_PROPELL= ER_PROFILE_PREFIX=3D diff --git a/MAINTAINERS b/MAINTAINERS index d6ea49433747a..42e3af0791e15 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -18449,6 +18449,13 @@ S: Maintained F: include/linux/psi* F: kernel/sched/psi.c =20 +PROPELLER BUILD +M: Rong Xu +M: Han Shen +S: Supported +F: Documentation/dev-tools/propeller.rst +F: scripts/Makefile.propeller + PRINTK M: Petr Mladek R: Steven Rostedt diff --git a/Makefile b/Makefile index f7dee6cee3c29..facf889fe0480 100644 --- a/Makefile +++ b/Makefile @@ -1019,6 +1019,7 @@ include-$(CONFIG_UBSAN) +=3D scripts/Makefile.ubsan include-$(CONFIG_KCOV) +=3D scripts/Makefile.kcov include-$(CONFIG_RANDSTRUCT) +=3D scripts/Makefile.randstruct include-$(CONFIG_AUTOFDO_CLANG) +=3D scripts/Makefile.autofdo +include-$(CONFIG_PROPELLER_CLANG) +=3D scripts/Makefile.propeller include-$(CONFIG_GCC_PLUGINS) +=3D scripts/Makefile.gcc-plugins =20 include $(addprefix $(srctree)/, $(include-y)) diff --git a/arch/Kconfig b/arch/Kconfig index 39b5a705aee32..faceb9b733cfb 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -831,6 +831,25 @@ config AUTOFDO_CLANG =20 If unsure, say N. =20 +config ARCH_SUPPORTS_PROPELLER_CLANG + bool + +config PROPELLER_CLANG + bool "Enable Clang's Propeller build" + depends on ARCH_SUPPORTS_PROPELLER_CLANG + depends on CC_IS_CLANG && CLANG_VERSION >=3D 190000 + help + This option enables Clang=E2=80=99s Propeller build. When the Propeller + profiles is specified in variable CLANG_PROPELLER_PROFILE_PREFIX + during the build process, Clang uses the profiles to optimize + the kernel. + + If no profile is specified, Propeller options are still passed + to Clang to facilitate the collection of perf data for creating + the Propeller profiles in subsequent builds. + + If unsure, say N. + config ARCH_SUPPORTS_CFI_CLANG bool help diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 503a0268155ab..da47164bfddc3 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -127,6 +127,7 @@ config X86 select ARCH_SUPPORTS_LTO_CLANG_THIN select ARCH_SUPPORTS_RT select ARCH_SUPPORTS_AUTOFDO_CLANG + select ARCH_SUPPORTS_PROPELLER_CLANG if X86_64 select ARCH_USE_BUILTIN_BSWAP select ARCH_USE_CMPXCHG_LOCKREF if X86_CMPXCHG64 select ARCH_USE_MEMTEST diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S index b8c5741d2fb48..cf22081601ed6 100644 --- a/arch/x86/kernel/vmlinux.lds.S +++ b/arch/x86/kernel/vmlinux.lds.S @@ -443,6 +443,10 @@ SECTIONS =20 STABS_DEBUG DWARF_DEBUG +#ifdef CONFIG_PROPELLER_CLANG + .llvm_bb_addr_map : { *(.llvm_bb_addr_map) } +#endif + ELF_DETAILS =20 DISCARDS diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinu= x.lds.h index 8a0bb3946cf05..c995474e4c649 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -95,14 +95,14 @@ * With LTO_CLANG, the linker also splits sections by default, so we need * these macros to combine the sections during the final link. * - * With AUTOFDO_CLANG, by default, the linker splits text sections and - * regroups functions into subsections. + * With AUTOFDO_CLANG and PROPELLER_CLANG, by default, the linker splits + * text sections and regroups functions into subsections. * * RODATA_MAIN is not used because existing code already defines .rodata.x * sections to be brought in with rodata. */ #if defined(CONFIG_LD_DEAD_CODE_DATA_ELIMINATION) || defined(CONFIG_LTO_CL= ANG) || \ -defined(CONFIG_AUTOFDO_CLANG) +defined(CONFIG_AUTOFDO_CLANG) || defined(CONFIG_PROPELLER_CLANG) #define TEXT_MAIN .text .text.[0-9a-zA-Z_]* #else #define TEXT_MAIN .text diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib index 2d0942c1a0277..e7859ad90224a 100644 --- a/scripts/Makefile.lib +++ b/scripts/Makefile.lib @@ -201,6 +201,16 @@ _c_flags +=3D $(if $(patsubst n%,, \ $(CFLAGS_AUTOFDO_CLANG)) endif =20 +# +# Enable Propeller build flags except some files or directories we don't w= ant to +# enable (depends on variables AUTOFDO_PROPELLER_obj.o and PROPELLER_PROFI= LE). +# +ifdef CONFIG_PROPELLER_CLANG +_c_flags +=3D $(if $(patsubst n%,, \ + $(AUTOFDO_PROFILE_$(target-stem).o)$(AUTOFDO_PROFILE)$(PROPELLER_PROFILE)= )$(is-kernel-object), \ + $(CFLAGS_PROPELLER_CLANG)) +endif + # $(src) for including checkin headers from generated source files # $(obj) for including generated headers from checkin source files ifeq ($(KBUILD_EXTMOD),) diff --git a/scripts/Makefile.propeller b/scripts/Makefile.propeller new file mode 100644 index 0000000000000..344190717e471 --- /dev/null +++ b/scripts/Makefile.propeller @@ -0,0 +1,28 @@ +# SPDX-License-Identifier: GPL-2.0 + +# Enable available and selected Clang Propeller features. +ifdef CLANG_PROPELLER_PROFILE_PREFIX + CFLAGS_PROPELLER_CLANG :=3D -fbasic-block-sections=3Dlist=3D$(CLANG_PROP= ELLER_PROFILE_PREFIX)_cc_profile.txt -ffunction-sections + KBUILD_LDFLAGS +=3D --symbol-ordering-file=3D$(CLANG_PROPELLER_PROFILE_P= REFIX)_ld_profile.txt --no-warn-symbol-ordering +else + CFLAGS_PROPELLER_CLANG :=3D -fbasic-block-sections=3Dlabels +endif + +# Propeller requires debug information to embed module names in the profil= es. +# If CONFIG_DEBUG_INFO is not enabled, set -gmlt option. Skip this for Aut= oFDO, +# as the option should already be set. +ifndef CONFIG_DEBUG_INFO + ifndef CONFIG_AUTOFDO_CLANG + CFLAGS_PROPELLER_CLANG +=3D -gmlt + endif +endif + +ifdef CONFIG_LTO_CLANG_THIN + ifdef CLANG_PROPELLER_PROFILE_PREFIX + KBUILD_LDFLAGS +=3D --lto-basic-block-sections=3D$(CLANG_PROPELLER_PRO= FILE_PREFIX)_cc_profile.txt + else + KBUILD_LDFLAGS +=3D --lto-basic-block-sections=3Dlabels + endif +endif + +export CFLAGS_PROPELLER_CLANG diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 4c5229991e1e0..05a0fb4a3d1a0 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -4558,6 +4558,7 @@ static int validate_ibt(struct objtool_file *file) !strcmp(sec->name, "__mcount_loc") || !strcmp(sec->name, ".kcfi_traps") || !strcmp(sec->name, ".llvm.call-graph-profile") || + !strcmp(sec->name, ".llvm_bb_addr_map") || strstr(sec->name, "__patchable_function_entries")) continue; =20 --=20 2.47.0.163.g1226f6d8fa-goog