[RFC,v2,3/3] x86/unwind/orc: remove run-time ORC unwind tables sort
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Message ID 20191108071108.72132-4-shile.zhang@linux.alibaba.com
State New
Headers show
Series
  • Speed booting by sorting ORC unwind tables at build time
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Commit Message

Shile Zhang Nov. 8, 2019, 7:11 a.m. UTC
From: Shile Zhang <shile.zhang@linux.alibaba.com>

The orc_unwind and orc_unwind_ip tables are sorted in vmlinux link phase
at build time, just remove the run-time sort.

Signed-off-by: Shile Zhang <shile.zhang@linux.alibaba.com>
---
 arch/x86/kernel/unwind_orc.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

Patch
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diff --git a/arch/x86/kernel/unwind_orc.c b/arch/x86/kernel/unwind_orc.c
index 332ae6530fa8..eccb9ac1e2fe 100644
--- a/arch/x86/kernel/unwind_orc.c
+++ b/arch/x86/kernel/unwind_orc.c
@@ -273,9 +273,10 @@  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, orc_unwind and orc_unwind_ip tables has been sorted in
+	 * vmlinux link phase at build time. Its ready for binary search.
+	 */
 
 	/* Initialize the fast lookup table: */
 	lookup_num_blocks = orc_lookup_end - orc_lookup;