kbuild: filter away debug symbols from kernel symbols (aab34ac8) · Commits · 戴 / test

Andi Kleen <andi@firstfloor.org> reported that he saw a lot of symbols like this: 0000000000000b24 N DW.aio.h.903a6d92.2 0000000000000bce N DW.task_io_accounting.h.8d8de327.0 0000000000000bec N DW.hrtimer.h.c23659c6.0 in his System.map / kallsyms output. Simple solution is to skip all debugging symbols (they are marked 'N'). Signed-off-by:

Sam Ravnborg <sam@ravnborg.org> Cc: Paulo Marques <pmarques@grupopie.com>

scripts/kallsyms.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -108,6 +108,9 @@ static int read_symbol(FILE in, struct sym_entry s)
		/* exclude also MIPS ELF local symbols ($L123 instead of .L123) */
		else if (str[0] == '$')
		return -1;
		/* exclude debugging symbols */
		else if (stype == 'N')
		return -1;

		/* include the type field in the symbol name, so that it gets
		* compressed together */

scripts/mksysmap

+2 −1

Original line number	Diff line number	Diff line
		@@ -32,6 +32,7 @@
		# For System.map filter away:
		# a - local absolute symbols
		# U - undefined global symbols
		# N - debugging symbols
		# w - local weak symbols

		# readprofile starts reading symbols when _stext is found, and
		@@ -40,5 +41,5 @@
		# so we just ignore them to let readprofile continue to work.
		# (At least sparc64 has __crc_ in the middle).

		$NM -n $1 \| grep -v '$ [aUw] $\\|$__crc_$\\|$ \$[adt]$' > $2
		$NM -n $1 \| grep -v '$ [aNUw] $\\|$__crc_$\\|$ \$[adt]$' > $2

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