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GET /api/1.2/patches/2219872/?format=api
{ "id": 2219872, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2219872/?format=api", "web_url": "http://patchwork.ozlabs.org/project/glibc/patch/20260405035323.558335-4-wangrui@loongson.cn/", "project": { "id": 41, "url": "http://patchwork.ozlabs.org/api/1.2/projects/41/?format=api", "name": "GNU C Library", "link_name": "glibc", "list_id": "libc-alpha.sourceware.org", "list_email": "libc-alpha@sourceware.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260405035323.558335-4-wangrui@loongson.cn>", "list_archive_url": null, "date": "2026-04-05T03:53:19", "name": "[v8,3/6] elf: Introduce _dl_map_segment_align hook for segment alignment tuning", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "87a10db106a442b395e249703e2fe0eefc659bec", "submitter": { "id": 85150, "url": "http://patchwork.ozlabs.org/api/1.2/people/85150/?format=api", "name": "WANG Rui", "email": "wangrui@loongson.cn" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/glibc/patch/20260405035323.558335-4-wangrui@loongson.cn/mbox/", "series": [ { "id": 498763, "url": "http://patchwork.ozlabs.org/api/1.2/series/498763/?format=api", "web_url": "http://patchwork.ozlabs.org/project/glibc/list/?series=498763", "date": "2026-04-05T03:53:16", "name": "elf: THP-aware load segment alignment", "version": 8, "mbox": "http://patchwork.ozlabs.org/series/498763/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2219872/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2219872/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "libc-alpha@sourceware.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "libc-alpha@sourceware.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org\n (client-ip=2620:52:6:3111::32; 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server2.sourceware.org", "From": "WANG Rui <wangrui@loongson.cn>", "To": "libc-alpha@sourceware.org", "Cc": "Adhemerval Zanella <adhemerval.zanella@linaro.org>,\n Dev Jain <dev.jain@arm.com>, Florian Weimer <fweimer@redhat.com>,\n Wilco Dijkstra <Wilco.Dijkstra@arm.com>, Xi Ruoyao <xry111@xry111.site>,\n WANG Xuerui <git@xen0n.name>, caiyinyu <caiyinyu@loongson.cn>,\n mengqinggang <mengqinggang@loongson.cn>,\n Huacai Chen <chenhuacai@kernel.org>, hjl.tools@gmail.com,\n WANG Rui <wangrui@loongson.cn>", "Subject": "[PATCH v8 3/6] elf: Introduce _dl_map_segment_align hook for segment\n alignment tuning", "Date": "Sun, 5 Apr 2026 11:53:19 +0800", "Message-ID": "<20260405035323.558335-4-wangrui@loongson.cn>", "X-Mailer": "git-send-email 2.53.0", "In-Reply-To": "<20260405035323.558335-1-wangrui@loongson.cn>", "References": "<20260405035323.558335-1-wangrui@loongson.cn>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-CM-TRANSID": "qMiowJBxDOHK3NFpP1JlAA--.44692S5", "X-CM-SenderInfo": "pzdqw2txl6z05rqj20fqof0/", "X-Coremail-Antispam": "1Uk129KBj93XoWxCFyktFW8tF4Dtr1ftw1xtFc_yoW5Ww45pF\n 97CF4rKF1rJF17CFZ3t3W2kr15X3WrGF4YyrnxuwnrZrs7GFy8XrZIv3WYgryrGrW8CF4S\n vFZFqF98Ca1rArcCm3ZEXasCq-sJn29KB7ZKAUJUUUU7529EdanIXcx71UUUUU7KY7ZEXa\n sCq-sGcSsGvfJ3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU\n 0xBIdaVrnRJUUUBYb4IE77IF4wAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26cxKx2\n IYs7xG6rWj6s0DM7CIcVAFz4kK6r1a6r1DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v\n e4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Xr0_Ar1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI\n 0_Gr0_Cr1l84ACjcxK6I8E87Iv67AKxVW8JVWxJwA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_\n Gr0_Gr1UM2kKe7AKxVWUXVWUAwAS0I0E0xvYzxvE52x082IY62kv0487Mc804VCY07AIYI\n kI8VC2zVCFFI0UMc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUtVWr\n XwAv7VC2z280aVAFwI0_Gr0_Cr1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI4\n 8JMxkF7I0En4kS14v26r126r1DMxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j\n 6r4UMxCIbckI1I0E14v26r1Y6r17MI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwV\n AFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY6xIIjxv2\n 0xvE14v26ryj6F1UMIIF0xvE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwCI42IY6xAIw20EY4\n v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Gr0_Cr1lIxAIcVC2z280aVCY1x0267AK\n xVW8JVW8JrUvcSsGvfC2KfnxnUUI43ZEXa7IU1mii3UUUUU==", "X-BeenThere": "libc-alpha@sourceware.org", "X-Mailman-Version": "2.1.30", "Precedence": "list", "List-Id": "Libc-alpha mailing list <libc-alpha.sourceware.org>", "List-Unsubscribe": "<https://sourceware.org/mailman/options/libc-alpha>,\n <mailto:libc-alpha-request@sourceware.org?subject=unsubscribe>", "List-Archive": "<https://sourceware.org/pipermail/libc-alpha/>", "List-Post": "<mailto:libc-alpha@sourceware.org>", "List-Help": "<mailto:libc-alpha-request@sourceware.org?subject=help>", "List-Subscribe": "<https://sourceware.org/mailman/listinfo/libc-alpha>,\n <mailto:libc-alpha-request@sourceware.org?subject=subscribe>", "Errors-To": "libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org" }, "content": "Introduce a new helper function, _dl_map_segment_align, to allow\narchitecture-specific adjustment of ELF load segment alignment during\nobject mapping.\n\nThe generic ELF loader now calls this hook when determining the maximum\nsegment alignment. The generic implementation is a no-op and preserves\nexisting behavior.\n\nThis provides a well-defined extension point for architectures that\nneed to adjust segment alignment policies (for example, to improve\nmapping efficiency or enable platform-specific optimizations) without\nembedding such logic directly in the generic loader.\n\nReviewed-by: Wilco Dijkstra <Wilco.Dijkstra@arm.com>\nSigned-off-by: WANG Rui <wangrui@loongson.cn>\n---\n elf/dl-load.c | 4 ++++\n sysdeps/generic/dl-map-segment-align.h | 26 ++++++++++++++++++++++++++\n 2 files changed, 30 insertions(+)\n create mode 100644 sysdeps/generic/dl-map-segment-align.h", "diff": "diff --git a/elf/dl-load.c b/elf/dl-load.c\nindex 7355eef8e76..f3d943e99c0 100644\n--- a/elf/dl-load.c\n+++ b/elf/dl-load.c\n@@ -71,6 +71,7 @@ struct filebuf\n #include <dl-dst.h>\n #include <dl-load.h>\n #include <dl-map-segments.h>\n+#include <dl-map-segment-align.h>\n #include <dl-unmap-segments.h>\n #include <dl-machine-reject-phdr.h>\n #include <dl-prop.h>\n@@ -1171,6 +1172,9 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,\n \n \t /* Optimize a common case. */\n \t c->prot = pf_to_prot (ph->p_flags);\n+\n+\t /* Architecture-specific adjustment of segment alignment. */\n+\t p_align_max = _dl_map_segment_align (c, p_align_max);\n \t break;\n \n \tcase PT_TLS:\ndiff --git a/sysdeps/generic/dl-map-segment-align.h b/sysdeps/generic/dl-map-segment-align.h\nnew file mode 100644\nindex 00000000000..f4a671f25f8\n--- /dev/null\n+++ b/sysdeps/generic/dl-map-segment-align.h\n@@ -0,0 +1,26 @@\n+/* _dl_map_segment_align. Generic version.\n+ Copyright (C) 2026 Free Software Foundation, Inc.\n+ Copyright The GNU Toolchain Authors.\n+ This file is part of the GNU C Library.\n+\n+ The GNU C Library is free software; you can redistribute it and/or\n+ modify it under the terms of the GNU Lesser General Public\n+ License as published by the Free Software Foundation; either\n+ version 2.1 of the License, or (at your option) any later version.\n+\n+ The GNU C Library is distributed in the hope that it will be useful,\n+ but WITHOUT ANY WARRANTY; without even the implied warranty of\n+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU\n+ Lesser General Public License for more details.\n+\n+ You should have received a copy of the GNU Lesser General Public\n+ License along with the GNU C Library; if not, see\n+ <https://www.gnu.org/licenses/>. */\n+\n+#include <dl-load.h>\n+\n+static inline ElfW(Addr)\n+_dl_map_segment_align (const struct loadcmd *c, ElfW(Addr) p_align_max)\n+{\n+ return p_align_max;\n+}\n", "prefixes": [ "v8", "3/6" ] }