linux-kernel - [RFC PATCH 3/4] x86/unwind/orc: Skip sorting if BUILDTIME_ORCTABLE

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Date:   Thu,  7 Nov 2019 22:32:04 +0800
From:   shile.zhang@...ux.alibaba.com
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>, x86@...nel.org
Cc:     "H . Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org,
        Shile Zhang <shile.zhang@...ux.alibaba.com>
Subject: [RFC PATCH 3/4] x86/unwind/orc: Skip sorting if BUILDTIME_ORCTABLE_SORT is configured

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

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;
-- 
2.24.0.rc2