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x86/unwind/orc: Remove boot-time ORC unwind tables sorting

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Now that the orc_unwind and orc_unwind_ip tables are sorted at build time,
remove the boot time sorting pass.

No change in functionality.

[ mingo: Rewrote the changelog and code comments. ]

Signed-off-by: Shile Zhang <shile.zhang@linux.alibaba.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-kbuild@vger.kernel.org
Link: https://lkml.kernel.org/r/20191204004633.88660-8-shile.zhang@linux.alibaba.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Shile Zhang 2019-12-04 08:46:33 +08:00 committed by Ingo Molnar
parent 57fa189942
commit f14bf6a350
2 changed files with 9 additions and 4 deletions
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8
arch/x86/kernel/unwind_orc.c
View File

@ -273,9 +273,11 @@ void __init unwind_init(void)
return;
}
/* Sort the .orc_unwind and .orc_unwind_ip tables: */
sort(__start_orc_unwind_ip, num_entries, sizeof(int), orc_sort_cmp,
orc_sort_swap);
/*
* Note, the orc_unwind and orc_unwind_ip tables were already
* sorted at build time via the 'sorttable' tool.
* It's ready for binary search straight away, no need to sort it.
*/
/* Initialize the fast lookup table: */
lookup_num_blocks = orc_lookup_end - orc_lookup;

5
scripts/link-vmlinux.sh
View File

@ -306,7 +306,10 @@ vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o}
if [ -n "${CONFIG_BUILDTIME_TABLE_SORT}" ]; then
info SORTTAB vmlinux
sorttable vmlinux
if ! sorttable vmlinux; then
echo >&2 Failed to sort kernel tables
exit 1
fi
fi
info SYSMAP System.map