linux-kernel - [PATCH 16/17] genksyms: fix syntax error for builtin (u)int*x*

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Message-ID: <20250113150253.3097820-17-masahiroy@kernel.org>
Date: Tue, 14 Jan 2025 00:00:54 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: linux-kbuild@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Masahiro Yamada <masahiroy@...nel.org>
Subject: [PATCH 16/17] genksyms: fix syntax error for builtin (u)int*x*_t types

A longstanding issue with genksyms is that it has hidden syntax errors.

When a syntax error occurs, yyerror() is called. However,
error_with_pos() is a no-op unless the -w option is provided.

You can observe syntax errors by manually passing the -w option.

For example, genksyms fails to parse the following code in
arch/arm64/lib/xor-neon.c:

    static inline uint64x2_t eor3(uint64x2_t p, uint64x2_t q, uint64x2_t r)
    {
            [ snip ]
    }

The syntax error occurs because genksyms does not recognize the
uint64x2_t keyword.

This commit adds support for builtin types described in Arm Neon
Intrinsics Reference.

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

 scripts/genksyms/lex.l | 1 +
 1 file changed, 1 insertion(+)

diff --git a/scripts/genksyms/lex.l b/scripts/genksyms/lex.l
index a1f969dcf24f..22aeb57649d9 100644
--- a/scripts/genksyms/lex.l
+++ b/scripts/genksyms/lex.l
@@ -51,6 +51,7 @@ MC_TOKEN		([~%^&*+=|<>/-]=)|(&&)|("||")|(->)|(<<)|(>>)

 %%

+u?int(8|16|32|64)x(1|2|4|8|16)_t	return BUILTIN_INT_KEYW;

  /* Keep track of our location in the original source files.  */
 ^#[ \t]+{INT}[ \t]+\"[^\"\n]+\".*\n	return FILENAME;
-- 
2.43.0