From nobody Wed Feb 11 05:07:47 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C78A5C7EE22 for ; Thu, 11 May 2023 14:23:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238283AbjEKOXv (ORCPT ); Thu, 11 May 2023 10:23:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42302 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238258AbjEKOXg (ORCPT ); Thu, 11 May 2023 10:23:36 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2C9F7E66; Thu, 11 May 2023 07:23:24 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 0F86264DFE; Thu, 11 May 2023 14:23:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 991FBC433D2; Thu, 11 May 2023 14:23:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1683815000; bh=RBBjQJhyNTq4SLepJRhrNnLCCMrJFLXtNe6TLcXndOU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DuTL2omz4fj1qRlJSZXZGLrBNoL39rBeuQpXk/KjnbC+dCNf4/gp6IJF22P4VJuTU 5Kur7PM3FMd7AFMbVodq9zu/bH7kktW8XkJ/+PzymDCAmEDBvrAVzrwE0/Mpf1vDE1 Q2XB19rffNaqwD2DN8kZ6kNDnulVKfEHfvS3yxAbb1XgXJ5V+R3dx3NRkVLL0mar8Z +ajhWfJ0YLRTSbzTAv/aBaYgFmApf55tt4Rj18Bw1AzC6bbl+43pkg3Jr3oihI0ArN QM1onojNiOUFyt2IN193TDX3CeEGQXKyAnG5QVCT98vT4fjeFY9pIUDhiRljGoGKi4 0MOl+1qd56rVw== From: Jisheng Zhang To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Arnd Bergmann Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org Subject: [PATCH 1/4] riscv: vmlinux-xip.lds.S: remove .alternative section Date: Thu, 11 May 2023 22:12:08 +0800 Message-Id: <20230511141211.2418-2-jszhang@kernel.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230511141211.2418-1-jszhang@kernel.org> References: <20230511141211.2418-1-jszhang@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" ALTERNATIVE mechanism can't work on XIP, and this is also reflected by below Kconfig dependency: RISCV_ALTERNATIVE ... depends on !XIP_KERNEL ... So there's no .alternative section at all for XIP case, remove it. Signed-off-by: Jisheng Zhang Reviewed-by: Conor Dooley --- arch/riscv/kernel/vmlinux-xip.lds.S | 6 ------ 1 file changed, 6 deletions(-) diff --git a/arch/riscv/kernel/vmlinux-xip.lds.S b/arch/riscv/kernel/vmlinu= x-xip.lds.S index eab9edc3b631..50767647fbc6 100644 --- a/arch/riscv/kernel/vmlinux-xip.lds.S +++ b/arch/riscv/kernel/vmlinux-xip.lds.S @@ -98,12 +98,6 @@ SECTIONS __soc_builtin_dtb_table_end =3D .; } =20 - . =3D ALIGN(8); - .alternative : { - __alt_start =3D .; - *(.alternative) - __alt_end =3D .; - } __init_end =3D .; =20 . =3D ALIGN(16); --=20 2.40.1 From nobody Wed Feb 11 05:07:47 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D6637C7EE22 for ; Thu, 11 May 2023 14:23:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238402AbjEKOXz (ORCPT ); Thu, 11 May 2023 10:23:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42316 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238130AbjEKOXh (ORCPT ); Thu, 11 May 2023 10:23:37 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5FB45E49; Thu, 11 May 2023 07:23:25 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id E8E1F64DFB; Thu, 11 May 2023 14:23:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DCFA2C433EF; Thu, 11 May 2023 14:23:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1683815002; bh=Qsoh2DY7RYTsIMpTH0GDqs55ax7692t2wbeau6VO2qk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uXb2rCTojbnqqTn8P5YlUMw1+SbNkb9+0LGdTYGVAsGB5VW7NiYN9ojgrezU7ny/I /4/MfKa1ZkIhiwP4Pxwvia4Fb44hFJFum1axBzCT0AunQRiQJYmqbeHky99hKG3Y4y hnlCgZd4yJo767E4hiQTcj2oSoQZWYDf4edI6H05y3e8Axa8JuV6dUrNTeQFkv/82C WFc2+SUJR7u6hIGjtwp9qNR+SpzY6xENyrESHr4WgLFQdLbO+yqP06u2gCFY0fWZZD EvQeqAUKXv2u3eUDWLZl+kZdcJYBvi+BLAY6Rch79ST0BeLCol71cqzKsN5l2GhPpX WYB2MfCiS68NQ== From: Jisheng Zhang To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Arnd Bergmann Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org Subject: [PATCH 2/4] riscv: move HAVE_RETHOOK to keep entries sorted Date: Thu, 11 May 2023 22:12:09 +0800 Message-Id: <20230511141211.2418-3-jszhang@kernel.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230511141211.2418-1-jszhang@kernel.org> References: <20230511141211.2418-1-jszhang@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Commit b57c2f124098 ("riscv: add riscv rethook implementation") selects the HAVE_RETHOOK option for the first time in riscv, but it breaks the entries order. Properly move its location to keep entries sorted. Signed-off-by: Jisheng Zhang Reviewed-by: Conor Dooley --- arch/riscv/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 348c0fa1fc8c..f0663b52d052 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -110,7 +110,6 @@ config RISCV select HAVE_KPROBES if !XIP_KERNEL select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL select HAVE_KRETPROBES if !XIP_KERNEL - select HAVE_RETHOOK if !XIP_KERNEL select HAVE_MOVE_PMD select HAVE_MOVE_PUD select HAVE_PCI @@ -119,6 +118,7 @@ config RISCV select HAVE_PERF_USER_STACK_DUMP select HAVE_POSIX_CPU_TIMERS_TASK_WORK select HAVE_REGS_AND_STACK_ACCESS_API + select HAVE_RETHOOK if !XIP_KERNEL select HAVE_RSEQ select HAVE_STACKPROTECTOR select HAVE_SYSCALL_TRACEPOINTS --=20 2.40.1 From nobody Wed Feb 11 05:07:47 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0453AC77B7F for ; Thu, 11 May 2023 14:24:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238423AbjEKOX6 (ORCPT ); Thu, 11 May 2023 10:23:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42418 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238156AbjEKOXh (ORCPT ); Thu, 11 May 2023 10:23:37 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5FCDA83DD; Thu, 11 May 2023 07:23:25 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id D2098610A2; Thu, 11 May 2023 14:23:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C6235C433D2; Thu, 11 May 2023 14:23:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1683815004; bh=XDpfU4QGkxHCk0PcVXqfWjLiQT8efnUkxx2g6qxryQw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qQiuEKd25qGNxzMC/VzrANFNkwAxyE7/iChs3QZIM0Bl4Uf4R84Ga0Dk42m888RVb fZ5NEuJv2QYk/nbcRcn0laW4g0chl+t0F6Ys/PVmoOzQFtoKnV8Cwq2Hnz1p/qyEdN 3VslTOtUm1M6/+smqskiwzYeuZtAeIFuxw5iJK6IfppnovvZMeSW+/RWvMFQmkKWsA QFVLYHSkX3p/xZVTibvWsP7LuGrv+ede51WSunQKrRYZ12ZZ1TEAs9KJkoCICil8WS NsAELJWQYEM/WSNI8mrXsecWykxDQQlRdYYIWKMGZ/9YsQWUpbJ9GfilidJPpuTkBl wkEaw9Qq3jlYw== From: Jisheng Zhang To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Arnd Bergmann Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org Subject: [PATCH 3/4] vmlinux.lds.h: use correct .init.data.* section name Date: Thu, 11 May 2023 22:12:10 +0800 Message-Id: <20230511141211.2418-4-jszhang@kernel.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230511141211.2418-1-jszhang@kernel.org> References: <20230511141211.2418-1-jszhang@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" If building with -fdata-sections on riscv, LD_ORPHAN_WARN will warn similar as below: riscv64-linux-gnu-ld: warning: orphan section `.init.data.efi_loglevel' from `./drivers/firmware/efi/libstub/printk.stub.o' being placed in section `.init.data.efi_loglevel' I believe this is caused by a a typo: init.data.* should be .init.data.* Signed-off-by: Jisheng Zhang --- include/asm-generic/vmlinux.lds.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinu= x.lds.h index d1f57e4868ed..371026ca7221 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -688,7 +688,7 @@ /* init and exit section handling */ #define INIT_DATA \ KEEP(*(SORT(___kentry+*))) \ - *(.init.data init.data.*) \ + *(.init.data .init.data.*) \ MEM_DISCARD(init.data*) \ KERNEL_CTORS() \ MCOUNT_REC() \ --=20 2.40.1 From nobody Wed Feb 11 05:07:47 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B7AA6C77B7F for ; Thu, 11 May 2023 14:24:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238447AbjEKOYB (ORCPT ); Thu, 11 May 2023 10:24:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42332 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238169AbjEKOXj (ORCPT ); Thu, 11 May 2023 10:23:39 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A8EB6210D; Thu, 11 May 2023 07:23:27 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 3DBAF63335; Thu, 11 May 2023 14:23:27 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AEFB6C433EF; Thu, 11 May 2023 14:23:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1683815006; bh=EAl7BYyGkHSJ9u4z4v03MJVzoloTTUlxQ/6IkxdvXp8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aQAlhdryVtLrijn4plCYeD8GrNC3jkYYQfYYiLdqFuCbLL01xeMxATi5/b0BGkM3s 9pL1vpl41G7btsU04qC3KrO87rvLds7PncrgXtCzI0TzlLyAxUfqxe9l6sJ8pXHMhd yhQTtQsY8s1Rz8rB2ADYYC5lq2GjgG6p1lMoJRviovB4jhO0IgiPOanGPdogFRFGKf M8lKdsRm3s25cOtf3C6WMjn6jdc7/xNC+H3pGs4NafKn5ftut5UIqYwf1d8y4dUyr/ 48sWhQwCzLUjfP7GoO7r/wnUGOitDR2Mu+i737iw2WCUlf+W9v8lzun7HeOBvYMGVS PA6Eg16UdnlTQ== From: Jisheng Zhang To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Arnd Bergmann Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org Subject: [PATCH 4/4] riscv: enable HAVE_LD_DEAD_CODE_DATA_ELIMINATION Date: Thu, 11 May 2023 22:12:11 +0800 Message-Id: <20230511141211.2418-5-jszhang@kernel.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230511141211.2418-1-jszhang@kernel.org> References: <20230511141211.2418-1-jszhang@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" When trying to run linux with various opensource riscv core on resource limited FPGA platforms, for example, those FPGAs with less than 16MB SDRAM, I want to save mem as much as possible. One of the major technologies is kernel size optimizations, I found that riscv does not currently support HAVE_LD_DEAD_CODE_DATA_ELIMINATION, which passes -fdata-sections, -ffunction-sections to CFLAGS and passes the --gc-sections flag to the linker. This not only benefits my case on FPGA but also benefits defconfigs. Here are some notable improvements from enabling this with defconfigs: nommu_k210_defconfig: text data bss dec hex 1112009 410288 59837 1582134 182436 before 962838 376656 51285 1390779 1538bb after rv32_defconfig: text data bss dec hex 8804455 2816544 290577 11911576 b5c198 before 8692295 2779872 288977 11761144 b375f8 after defconfig: text data bss dec hex 9438267 3391332 485333 13314932 cb2b74 before 9285914 3350052 483349 13119315 c82f53 after Signed-off-by: Jisheng Zhang --- arch/riscv/Kconfig | 1 + arch/riscv/kernel/vmlinux.lds.S | 6 +++--- 2 files changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index f0663b52d052..a5feab2c3037 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -110,6 +110,7 @@ config RISCV select HAVE_KPROBES if !XIP_KERNEL select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL select HAVE_KRETPROBES if !XIP_KERNEL + select HAVE_LD_DEAD_CODE_DATA_ELIMINATION select HAVE_MOVE_PMD select HAVE_MOVE_PUD select HAVE_PCI diff --git a/arch/riscv/kernel/vmlinux.lds.S b/arch/riscv/kernel/vmlinux.ld= s.S index e5f9f4677bbf..492dd4b8f3d6 100644 --- a/arch/riscv/kernel/vmlinux.lds.S +++ b/arch/riscv/kernel/vmlinux.lds.S @@ -85,11 +85,11 @@ SECTIONS INIT_DATA_SECTION(16) =20 .init.pi : { - *(.init.pi*) + KEEP(*(.init.pi*)) } =20 .init.bss : { - *(.init.bss) /* from the EFI stub */ + KEEP(*(.init.bss*)) /* from the EFI stub */ } .exit.data : { @@ -112,7 +112,7 @@ SECTIONS . =3D ALIGN(8); .alternative : { __alt_start =3D .; - *(.alternative) + KEEP(*(.alternative)) __alt_end =3D .; } __init_end =3D .; --=20 2.40.1