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GET /api/patches/2218594/?format=api
{ "id": 2218594, "url": "http://patchwork.ozlabs.org/api/patches/2218594/?format=api", "web_url": "http://patchwork.ozlabs.org/project/uboot/patch/20260401-casey-ccf-compat-v2-3-414d5b7f040b@linaro.org/", "project": { "id": 18, "url": "http://patchwork.ozlabs.org/api/projects/18/?format=api", "name": "U-Boot", "link_name": "uboot", "list_id": "u-boot.lists.denx.de", "list_email": "u-boot@lists.denx.de", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260401-casey-ccf-compat-v2-3-414d5b7f040b@linaro.org>", "list_archive_url": null, "date": "2026-04-01T14:15:19", "name": "[v2,03/11] string: add strdup_const and kstrdup_const", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "4563d9259ba42e44be8b3ba132b951b55aa7c919", "submitter": { "id": 90679, "url": "http://patchwork.ozlabs.org/api/people/90679/?format=api", "name": "Casey Connolly", "email": "casey.connolly@linaro.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/uboot/patch/20260401-casey-ccf-compat-v2-3-414d5b7f040b@linaro.org/mbox/", "series": [ { "id": 498341, "url": "http://patchwork.ozlabs.org/api/series/498341/?format=api", "web_url": "http://patchwork.ozlabs.org/project/uboot/list/?series=498341", "date": "2026-04-01T14:15:17", "name": "Linux compat improvements and CCF prep", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/498341/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2218594/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2218594/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<u-boot-bounces@lists.denx.de>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=YFmalPzq;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=2a01:238:438b:c500:173d:9f52:ddab:ee01; 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charset=\"utf-8\"", "Content-Transfer-Encoding": "7bit", "Message-Id": "<20260401-casey-ccf-compat-v2-3-414d5b7f040b@linaro.org>", "References": "<20260401-casey-ccf-compat-v2-0-414d5b7f040b@linaro.org>", "In-Reply-To": "<20260401-casey-ccf-compat-v2-0-414d5b7f040b@linaro.org>", "To": "u-boot@lists.denx.de", "Cc": "Tom Rini <trini@konsulko.com>,\n Casey Connolly <casey.connolly@linaro.org>,\n Ilias Apalodimas <ilias.apalodimas@linaro.org>,\n Simon Glass <sjg@chromium.org>,\n Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>,\n Romain Gantois <romain.gantois@bootlin.com>,\n Andrew Goodbody <andrew.goodbody@linaro.org>,\n Patrice Chotard <patrice.chotard@foss.st.com>,\n Raymond Mao <raymondmaoca@gmail.com>, Peng Fan <peng.fan@nxp.com>", "X-Mailer": "b4 0.15-dev-47773", "X-Developer-Signature": "v=1; a=openpgp-sha256; l=4099;\n i=casey.connolly@linaro.org; h=from:subject:message-id;\n bh=5jwUMh0k+N1QnC8WW0D/qoE/XYGivWXyZ6pP2y+2UGs=;\n b=kA0DAAgReTBFn7kwMhcByyZiAGnNKHmggsWcTW3ArsECDhmbGF/UuHuzITyy/JVb9Aod6QUpv\n Yh1BAARCAAdFiEEF8imOYKt0z8ot6DQeTBFn7kwMhcFAmnNKHkACgkQeTBFn7kwMhc8AQEAk0fs\n J46w655p1IEnAosIiwCJQK3lw+VqGvyiXlHoqKoA/0J9VyFTEPZ0otojW1Ca/X7mexmtUkb6SrR\n aEEnFiiDO", "X-Developer-Key": "i=casey.connolly@linaro.org; a=openpgp;\n fpr=83B24DA7FE145076BC38BB250CD904EB673A7C47", "X-BeenThere": "u-boot@lists.denx.de", "X-Mailman-Version": "2.1.39", "Precedence": "list", "List-Id": "U-Boot discussion <u-boot.lists.denx.de>", "List-Unsubscribe": "<https://lists.denx.de/options/u-boot>,\n <mailto:u-boot-request@lists.denx.de?subject=unsubscribe>", "List-Archive": "<https://lists.denx.de/pipermail/u-boot/>", "List-Post": "<mailto:u-boot@lists.denx.de>", "List-Help": "<mailto:u-boot-request@lists.denx.de?subject=help>", "List-Subscribe": "<https://lists.denx.de/listinfo/u-boot>,\n <mailto:u-boot-request@lists.denx.de?subject=subscribe>", "Errors-To": "u-boot-bounces@lists.denx.de", "Sender": "\"U-Boot\" <u-boot-bounces@lists.denx.de>", "X-Virus-Scanned": "clamav-milter 0.103.8 at phobos.denx.de", "X-Virus-Status": "Clean" }, "content": "Extend Linux compat by adding kstrdup_const(), backed by lib/string.c.\nThis leverages U-Boots .rodata section on ARM64 to avoid pointlessly\nduplicating const strings.\n\nThis is used by the Linux CCF_FULL port and may be useful elsewhere\nin U-Boot.\n\nSigned-off-by: Casey Connolly <casey.connolly@linaro.org>\n---\n include/asm-generic/sections.h | 19 +++++++++++++++++++\n include/linux/compat.h | 13 +++++++++++++\n include/linux/string.h | 2 ++\n lib/string.c | 31 +++++++++++++++++++++++++++++++\n 4 files changed, 65 insertions(+)", "diff": "diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h\nindex d59787948fd1..48bd4fa86043 100644\n--- a/include/asm-generic/sections.h\n+++ b/include/asm-generic/sections.h\n@@ -8,8 +8,9 @@\n #ifndef _ASM_GENERIC_SECTIONS_H_\n #define _ASM_GENERIC_SECTIONS_H_\n \n #include <linux/types.h>\n+#include <stdbool.h>\n \n /* References to section boundaries */\n \n extern char _text[], _stext[], _etext[];\n@@ -61,8 +62,26 @@ static inline int arch_is_kernel_data(unsigned long addr)\n \treturn 0;\n }\n #endif\n \n+/**\n+ * is_kernel_rodata - checks if the pointer address is located in the\n+ * .rodata section\n+ *\n+ * @addr: address to check\n+ *\n+ * Returns: true if the address is located in .rodata, false otherwise.\n+ */\n+static inline bool is_kernel_rodata(unsigned long addr)\n+{\n+#ifdef CONFIG_ARM64\n+\treturn addr >= (unsigned long)__start_rodata &&\n+\t addr < (unsigned long)__end_rodata;\n+#else\n+\treturn false;\n+#endif\n+}\n+\n /* U-Boot-specific things begin here */\n \n /* Start of U-Boot text region */\n extern char __text_start[];\ndiff --git a/include/linux/compat.h b/include/linux/compat.h\nindex 623814516175..d4ba4d0088a0 100644\n--- a/include/linux/compat.h\n+++ b/include/linux/compat.h\n@@ -66,8 +66,21 @@ static inline void vfree(const void *addr)\n {\n \tfree((void *)addr);\n }\n \n+/**\n+ * kstrdup_const - conditionally duplicate an existing const string\n+ * @s: the string to duplicate\n+ * @gfp: the GFP mask used in the kmalloc() call when allocating memory\n+ *\n+ * Note: Strings allocated by kstrdup_const should be freed by kfree_const and\n+ * must not be passed to krealloc().\n+ *\n+ * Return: source string if it is in .rodata section otherwise\n+ * fallback to kstrdup.\n+ */\n+#define kstrdup_const(s, gfp) strdup_const(s)\n+\n struct kmem_cache { int sz; };\n \n struct kmem_cache *get_mem(int element_sz);\n #define kmem_cache_create(a, sz, c, d, e)\tget_mem(sz)\ndiff --git a/include/linux/string.h b/include/linux/string.h\nindex d943fcce690c..a8a6cf4af505 100644\n--- a/include/linux/string.h\n+++ b/include/linux/string.h\n@@ -103,8 +103,10 @@ size_t strcspn(const char *s, const char *reject);\n \n #ifndef __HAVE_ARCH_STRDUP\n extern char * strdup(const char *);\n extern char * strndup(const char *, size_t);\n+extern const char *strdup_const(const char *s);\n+extern void kfree_const(const void *x);\n #endif\n #ifndef __HAVE_ARCH_STRSWAB\n extern char * strswab(const char *);\n #endif\ndiff --git a/lib/string.c b/lib/string.c\nindex d56f88d4a847..302efe048b07 100644\n--- a/lib/string.c\n+++ b/lib/string.c\n@@ -378,8 +378,39 @@ char * strndup(const char *s, size_t n)\n \tnew[len] = '\\0';\n \n \treturn new;\n }\n+\n+/**\n+ * strdup_const - conditionally duplicate an existing const string\n+ * @s: the string to duplicate\n+ *\n+ * Note: Strings allocated by kstrdup_const should be freed by kfree_const and\n+ * must not be passed to krealloc().\n+ *\n+ * Return: source string if it is in .rodata section otherwise\n+ * fallback to kstrdup.\n+ */\n+const char *strdup_const(const char *s)\n+{\n+\tif (is_kernel_rodata((unsigned long)s))\n+\t\treturn s;\n+\n+\treturn strdup(s);\n+}\n+\n+/**\n+ * kfree_const - conditionally free memory\n+ * @x: pointer to the memory\n+ *\n+ * Function calls kfree only if @x is not in .rodata section.\n+ */\n+void kfree_const(const void *x)\n+{\n+\tif (!is_kernel_rodata((unsigned long)x))\n+\t\tfree((void *)x);\n+}\n+\n #endif\n \n #ifndef __HAVE_ARCH_STRSPN\n /**\n", "prefixes": [ "v2", "03/11" ] }