[PATCH 10/13] module: merge each_symbol_section into find_symbol

From: Christoph Hellwig <hch@lst.de>
To: Frederic Barrat <fbarrat@linux.ibm.com>,
	Andrew Donnellan <ajd@linux.ibm.com>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Maxime Ripard <mripard@kernel.org>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
	Jessica Yu <jeyu@kernel.org>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Jiri Kosina <jikos@kernel.org>, Miroslav Benes <mbenes@suse.cz>,
	Petr Mladek <pmladek@suse.com>,
	Joe Lawrence <joe.lawrence@redhat.com>
Cc: Masahiro Yamada <masahiroy@kernel.org>,
	Michal Marek <michal.lkml@markovi.net>,
	linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	dri-devel@lists.freedesktop.org, live-patching@vger.kernel.org,
	linux-kbuild@vger.kernel.org
Subject: [PATCH 10/13] module: merge each_symbol_section into find_symbol
Date: Thu, 21 Jan 2021 08:49:56 +0100	[thread overview]
Message-ID: <20210121074959.313333-11-hch@lst.de> (raw)
In-Reply-To: <20210121074959.313333-1-hch@lst.de>

each_symbol_section is only called by find_symbol, so merge the two
functions.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 kernel/module.c | 148 ++++++++++++++++++++++--------------------------
 1 file changed, 69 insertions(+), 79 deletions(-)

diff --git a/kernel/module.c b/kernel/module.c
index a9d092765c4eab..644dda52dae38c 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -433,73 +433,6 @@ extern const s32 __start___kcrctab_unused_gpl[];
 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
 #endif
 
-/* Returns true as soon as fn returns true, otherwise false. */
-static bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
-				    struct module *owner,
-				    void *data),
-			 void *data)
-{
-	unsigned int i;
-	struct module *mod;
-	static const struct symsearch arr[] = {
-		{ __start___ksymtab, __stop___ksymtab, __start___kcrctab,
-		  NOT_GPL_ONLY, false },
-		{ __start___ksymtab_gpl, __stop___ksymtab_gpl,
-		  __start___kcrctab_gpl,
-		  GPL_ONLY, false },
-		{ __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
-		  __start___kcrctab_gpl_future,
-		  WILL_BE_GPL_ONLY, false },
-#ifdef CONFIG_UNUSED_SYMBOLS
-		{ __start___ksymtab_unused, __stop___ksymtab_unused,
-		  __start___kcrctab_unused,
-		  NOT_GPL_ONLY, true },
-		{ __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
-		  __start___kcrctab_unused_gpl,
-		  GPL_ONLY, true },
-#endif
-	};
-
-	module_assert_mutex_or_preempt();
-
-	for (i = 0; i < ARRAY_SIZE(arr); i++)
-		if (fn(&arr[i], NULL, data))
-			return true;
-
-	list_for_each_entry_rcu(mod, &modules, list,
-				lockdep_is_held(&module_mutex)) {
-		struct symsearch arr[] = {
-			{ mod->syms, mod->syms + mod->num_syms, mod->crcs,
-			  NOT_GPL_ONLY, false },
-			{ mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
-			  mod->gpl_crcs,
-			  GPL_ONLY, false },
-			{ mod->gpl_future_syms,
-			  mod->gpl_future_syms + mod->num_gpl_future_syms,
-			  mod->gpl_future_crcs,
-			  WILL_BE_GPL_ONLY, false },
-#ifdef CONFIG_UNUSED_SYMBOLS
-			{ mod->unused_syms,
-			  mod->unused_syms + mod->num_unused_syms,
-			  mod->unused_crcs,
-			  NOT_GPL_ONLY, true },
-			{ mod->unused_gpl_syms,
-			  mod->unused_gpl_syms + mod->num_unused_gpl_syms,
-			  mod->unused_gpl_crcs,
-			  GPL_ONLY, true },
-#endif
-		};
-
-		if (mod->state == MODULE_STATE_UNFORMED)
-			continue;
-
-		for (i = 0; i < ARRAY_SIZE(arr); i++)
-			if (fn(&arr[i], mod, data))
-				return true;
-	}
-	return false;
-}
-
 struct find_symbol_arg {
 	/* Input */
 	const char *name;
@@ -610,24 +543,81 @@ static const struct kernel_symbol *find_symbol(const char *name,
 					bool gplok,
 					bool warn)
 {
-	struct find_symbol_arg fsa;
+	static const struct symsearch arr[] = {
+		{ __start___ksymtab, __stop___ksymtab, __start___kcrctab,
+		  NOT_GPL_ONLY, false },
+		{ __start___ksymtab_gpl, __stop___ksymtab_gpl,
+		  __start___kcrctab_gpl,
+		  GPL_ONLY, false },
+		{ __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
+		  __start___kcrctab_gpl_future,
+		  WILL_BE_GPL_ONLY, false },
+#ifdef CONFIG_UNUSED_SYMBOLS
+		{ __start___ksymtab_unused, __stop___ksymtab_unused,
+		  __start___kcrctab_unused,
+		  NOT_GPL_ONLY, true },
+		{ __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
+		  __start___kcrctab_unused_gpl,
+		  GPL_ONLY, true },
+#endif
+	};
+	struct find_symbol_arg fsa = {
+		.name = name,
+		.gplok = gplok,
+		.warn = warn,
+	};
+	struct module *mod;
+	unsigned int i;
+
+	module_assert_mutex_or_preempt();
+
+	for (i = 0; i < ARRAY_SIZE(arr); i++)
+		if (find_exported_symbol_in_section(&arr[i], NULL, &fsa))
+			goto found;
 
-	fsa.name = name;
-	fsa.gplok = gplok;
-	fsa.warn = warn;
+	list_for_each_entry_rcu(mod, &modules, list,
+				lockdep_is_held(&module_mutex)) {
+		struct symsearch arr[] = {
+			{ mod->syms, mod->syms + mod->num_syms, mod->crcs,
+			  NOT_GPL_ONLY, false },
+			{ mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
+			  mod->gpl_crcs,
+			  GPL_ONLY, false },
+			{ mod->gpl_future_syms,
+			  mod->gpl_future_syms + mod->num_gpl_future_syms,
+			  mod->gpl_future_crcs,
+			  WILL_BE_GPL_ONLY, false },
+#ifdef CONFIG_UNUSED_SYMBOLS
+			{ mod->unused_syms,
+			  mod->unused_syms + mod->num_unused_syms,
+			  mod->unused_crcs,
+			  NOT_GPL_ONLY, true },
+			{ mod->unused_gpl_syms,
+			  mod->unused_gpl_syms + mod->num_unused_gpl_syms,
+			  mod->unused_gpl_crcs,
+			  GPL_ONLY, true },
+#endif
+		};
 
-	if (each_symbol_section(find_exported_symbol_in_section, &fsa)) {
-		if (owner)
-			*owner = fsa.owner;
-		if (crc)
-			*crc = fsa.crc;
-		if (license)
-			*license = fsa.license;
-		return fsa.sym;
+		if (mod->state == MODULE_STATE_UNFORMED)
+			continue;
+
+		for (i = 0; i < ARRAY_SIZE(arr); i++)
+			if (find_exported_symbol_in_section(&arr[i], mod, &fsa))
+				goto found;
 	}
 
 	pr_debug("Failed to find symbol %s\n", name);
 	return NULL;
+
+found:
+	if (owner)
+		*owner = fsa.owner;
+	if (crc)
+		*crc = fsa.crc;
+	if (license)
+		*license = fsa.license;
+	return fsa.sym;
 }
 
 /*
-- 
2.29.2

