[RFC,3/4] x86/unwind/orc: Skip sorting if BUILDTIME_ORCTABLE_SORT is configured
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Message ID 20191107143205.206606-4-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. 7, 2019, 2:32 p.m. UTC
From: Shile Zhang <shile.zhang@linux.alibaba.com>

The orc_unwind and orc_unwind_ip tables are sorted at build time if
BUILDTIME_ORCTABLE_SORT is configured, skip sort at boot time.

Signed-off-by: Shile Zhang <shile.zhang@linux.alibaba.com>
---
 arch/x86/kernel/unwind_orc.c | 2 ++
 1 file changed, 2 insertions(+)

Patch
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diff --git a/arch/x86/kernel/unwind_orc.c b/arch/x86/kernel/unwind_orc.c
index 332ae6530fa8..2c2fa9ef116e 100644
--- a/arch/x86/kernel/unwind_orc.c
+++ b/arch/x86/kernel/unwind_orc.c
@@ -273,9 +273,11 @@  void __init unwind_init(void)
 		return;
 	}
 
+#ifndef CONFIG_BUILDTIME_ORCTABLE_SORT
 	/* Sort the .orc_unwind and .orc_unwind_ip tables: */
 	sort(__start_orc_unwind_ip, num_entries, sizeof(int), orc_sort_cmp,
 	     orc_sort_swap);
+#endif
 
 	/* Initialize the fast lookup table: */
 	lookup_num_blocks = orc_lookup_end - orc_lookup;