linux-kernel - [PATCH v2 3/4] kprobes: move x86-specific blacklist symbols to arch directory

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Date:	Thu, 4 Apr 2013 14:51:28 +0200
From:	Oskar Andero <oskar.andero@...ymobile.com>
To:	<linux-kernel@...r.kernel.org>
CC:	<linux-arch@...r.kernel.org>, <masami.hiramatsu.pt@...achi.com>,
	<davem@...emloft.net>, <anil.s.keshavamurthy@...el.com>,
	<ananth@...ibm.com>, <radovan.lekanovic@...ymobile.com>,
	<bjorn.davidsson@...ymobile.com>, <oskar.andero@...ymobile.com>
Subject: [PATCH v2 3/4] kprobes: move x86-specific blacklist symbols to arch directory

From: Björn Davidsson <bjorn.davidsson@...ymobile.com>

The common kprobes blacklist contains x86-specific symbols.
Looking for these in kallsyms takes unnecessary time during startup
on non-X86 platform. The symbols where moved to
arch/x86/kernel/kprobes/core.c.

Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: David S. Miller <davem@...emloft.net>
Cc: linux-arch@...r.kernel.org
Reviewed-by: Radovan Lekanovic <radovan.lekanovic@...ymobile.com>
Signed-off-by: Björn Davidsson <bjorn.davidsson@...ymobile.com>
Signed-off-by: Oskar Andero <oskar.andero@...ymobile.com>
---
 arch/x86/kernel/kprobes/core.c | 6 +++++-
 kernel/kprobes.c               | 3 ---
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c
index 4aa71a5..41ce6c1 100644
--- a/arch/x86/kernel/kprobes/core.c
+++ b/arch/x86/kernel/kprobes/core.c
@@ -65,7 +65,11 @@ void jprobe_return_end(void);
 DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
 DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
 
-const char * const arch_kprobes_blacksyms[] = {};
+const char * const arch_kprobes_blacksyms[] = {
+	"native_get_debugreg",
+	"irq_entries_start",
+	"common_interrupt",
+};
 const size_t arch_kprobes_blacksyms_size = ARRAY_SIZE(arch_kprobes_blacksyms);
 
 #define stack_addr(regs) ((unsigned long *)kernel_stack_pointer(regs))
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 7654278..58c9f4e 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -95,9 +95,6 @@ static raw_spinlock_t *kretprobe_table_lock_ptr(unsigned long hash)
  */
 static const char * const common_kprobes_blacksyms[] = {
 	"preempt_schedule",
-	"native_get_debugreg",
-	"irq_entries_start",
-	"common_interrupt",
 	"mcount",       /* mcount can be called from everywhere */
 };
 static const size_t common_kprobes_blacksyms_size =
-- 
1.8.1.5

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