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Date: Fri, 23 Nov 2012 21:44:02 +0100 (CET) From: Jan Engelhardt <jengelh@...i.de> To: tj@...nel.org, cl@...ux-foundation.org cc: linux-mm@...ck.org, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: percpu section failure with Gold linker Hi, when compiling a kernel with the gold linker (3.7.0-rc6 26d29d06ea0204, gcc-4.7 and binutils-2.23 in my case), certain pcpu symbols are seemingly errneously copied over from .o files to .ko files, leading to a hard warning during depmod: gold$ make -j8 LD=gold HOSTLD=gold gold$ make modules_install INSTALL_MOD_PATH=/tmp/foo [...] WARNING: /tmp/foo/lib/modules/3.7.0-rc6-jng6-default+ /kernel/net/rds/rds_tcp.ko needs unknown symbol __pcpu_scope_rds_tcp_stats This happens with many modules using percpu; looking at things with nm reveals: gold/net/ipv6$ nm ipv6.o | grep __pcpu_ 0000000000000000 D __pcpu_unique_ipv6_cookie_scratch gold/net/ipv6$ nm ipv6.ko | grep __pcpu_ U __pcpu_unique_ipv6_cookie_scratch On the other hand, in a linux tree built with the original ld (ld.bfd), things look like: bfd$ make -j8 [...] bfd/net/ipv6$ nm ipv6.o | grep pcpu 0000000000000000 D __pcpu_unique_ipv6_cookie_scratch bfd/net/ipv6$ nm ipv6.ko | grep pcpu (no result) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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