linux-kernel - [PATCH 5/8] scripts/kallsyms: move compiler-generated symbol patterns to mksysmap

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Message-Id: <20230308115243.82592-5-masahiroy@kernel.org>
Date:   Wed,  8 Mar 2023 20:52:40 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Zhen Lei <thunder.leizhen@...wei.com>,
        Arnd Bergmann <arnd@...db.de>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>
Subject: [PATCH 5/8] scripts/kallsyms: move compiler-generated symbol patterns to mksysmap

scripts/kallsyms.c maintains compiler-generated symbols, but we end up
with something similar in scripts/mksysmap to avoid the "Inconsistent
kallsyms data" error. For example, commit c17a2538704f ("mksysmap: Fix
the mismatch of 'L0' symbols in System.map").

They were separately maintained prior to commit 94ff2f63d6a3 ("kbuild:
reuse mksysmap output for kallsyms").

Now that scripts/kallsyms.c parses the output of scripts/mksysmap,
it makes more sense to collect all the ignored patterns to mksysmap.

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

 scripts/kallsyms.c | 59 ----------------------------------------------
 scripts/mksysmap   | 43 +++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+), 59 deletions(-)

diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index e572fda6fe42..97d514c0fc8f 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -102,65 +102,6 @@ static char *sym_name(const struct sym_entry *s)
 
 static bool is_ignored_symbol(const char *name, char type)
 {
-	/* Symbol names that exactly match to the following are ignored.*/
-	static const char * const ignored_symbols[] = {
-		"_SDA_BASE_",		/* ppc */
-		"_SDA2_BASE_",		/* ppc */
-		NULL
-	};
-
-	/* Symbol names that begin with the following are ignored.*/
-	static const char * const ignored_prefixes[] = {
-		"__efistub_",		/* arm64 EFI stub namespace */
-		"__kvm_nvhe_$",		/* arm64 local symbols in non-VHE KVM namespace */
-		"__kvm_nvhe_.L",	/* arm64 local symbols in non-VHE KVM namespace */
-		"__AArch64ADRPThunk_",	/* arm64 lld */
-		"__ARMV5PILongThunk_",	/* arm lld */
-		"__ARMV7PILongThunk_",
-		"__ThumbV7PILongThunk_",
-		"__LA25Thunk_",		/* mips lld */
-		"__microLA25Thunk_",
-		"__kcfi_typeid_",	/* CFI type identifiers */
-		NULL
-	};
-
-	/* Symbol names that end with the following are ignored.*/
-	static const char * const ignored_suffixes[] = {
-		"_from_arm",		/* arm */
-		"_from_thumb",		/* arm */
-		"_veneer",		/* arm */
-		NULL
-	};
-
-	/* Symbol names that contain the following are ignored.*/
-	static const char * const ignored_matches[] = {
-		".long_branch.",	/* ppc stub */
-		".plt_branch.",		/* ppc stub */
-		NULL
-	};
-
-	const char * const *p;
-
-	for (p = ignored_symbols; *p; p++)
-		if (!strcmp(name, *p))
-			return true;
-
-	for (p = ignored_prefixes; *p; p++)
-		if (!strncmp(name, *p, strlen(*p)))
-			return true;
-
-	for (p = ignored_suffixes; *p; p++) {
-		int l = strlen(name) - strlen(*p);
-
-		if (l >= 0 && !strcmp(name + l, *p))
-			return true;
-	}
-
-	for (p = ignored_matches; *p; p++) {
-		if (strstr(name, *p))
-			return true;
-	}
-
 	if (type == 'u' || type == 'n')
 		return true;
 
diff --git a/scripts/mksysmap b/scripts/mksysmap
index 1efd61ee0bac..d8ad6ff69320 100755
--- a/scripts/mksysmap
+++ b/scripts/mksysmap
@@ -36,6 +36,28 @@ ${NM} -n ${1} | sed >${2} -e "
 # local labels, .LBB, .Ltmpxxx, .L__unnamed_xx, .LASANPC, etc.
 / \.L/d
 
+# arm64 EFI stub namespace
+/ __efistub_/d
+
+# arm64 local symbols in non-VHE KVM namespace
+/ __kvm_nvhe_\$/d
+/ __kvm_nvhe_\.L/d
+
+# arm64 lld
+/ __AArch64ADRPThunk_/d
+
+# arm lld
+/ __ARMV5PILongThunk_/d
+/ __ARMV7PILongThunk_/d
+/ __ThumbV7PILongThunk_/d
+
+# mips lld
+/ __LA25Thunk_/d
+/ __microLA25Thunk_/d
+
+# CFI type identifiers
+/ __kcfi_typeid_/d
+
 # CRC from modversions
 / __crc_/d
 
@@ -45,6 +67,15 @@ ${NM} -n ${1} | sed >${2} -e "
 # EXPORT_SYMBOL (namespace)
 / __kstrtabns_/d
 
+# ---------------------------------------------------------------------------
+# Ignored suffixes
+#  (do not forget '$' after each pattern)
+
+# arm
+/_from_arm$/d
+/_from_thumb$/d
+/_veneer$/d
+
 # ---------------------------------------------------------------------------
 # Ignored symbols (exact match)
 #  (do not forget a space before and '$' after each pattern)
@@ -52,6 +83,18 @@ ${NM} -n ${1} | sed >${2} -e "
 # for LoongArch?
 / L0$/d
 
+# ppc
+/ _SDA_BASE_$/d
+/ _SDA2_BASE_$/d
+
+# ---------------------------------------------------------------------------
+# Ignored patterns
+#  (symbols that contain the pattern are ignored)
+
+# ppc stub
+/\.long_branch\./d
+/\.plt_branch\./d
+
 # ---------------------------------------------------------------------------
 # Ignored kallsyms symbols
 #
-- 
2.34.1