linux-kernel - [PATCH v5 5/6] kprobes: Use text_alloc() and text

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Message-Id: <20200724050553.1724168-6-jarkko.sakkinen@linux.intel.com>
Date:   Fri, 24 Jul 2020 08:05:52 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     linux-kernel@...r.kernel.org
Cc:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        linux-mm@...ck.org, Andi Kleen <ak@...ux.intel.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH v5 5/6] kprobes: Use text_alloc() and text_free()

Use text_alloc() and text_free() instead of module_alloc() and
module_memfree() when an arch provides them.

Cc: linux-mm@...ck.org
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
---
 kernel/kprobes.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 4e46d96d4e16..611fcda9f6bf 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -40,6 +40,7 @@
 #include <asm/cacheflush.h>
 #include <asm/errno.h>
 #include <linux/uaccess.h>
+#include <linux/vmalloc.h>
 
 #define KPROBE_HASH_BITS 6
 #define KPROBE_TABLE_SIZE (1 << KPROBE_HASH_BITS)
@@ -111,12 +112,20 @@ enum kprobe_slot_state {
 
 void __weak *alloc_insn_page(void)
 {
+#ifdef CONFIG_ARCH_HAS_TEXT_ALLOC
+	return text_alloc(PAGE_SIZE);
+#else
 	return module_alloc(PAGE_SIZE);
+#endif
 }
 
 void __weak free_insn_page(void *page)
 {
+#ifdef CONFIG_ARCH_HAS_TEXT_ALLOC
+	text_free(page);
+#else
 	module_memfree(page);
+#endif
 }
 
 struct kprobe_insn_cache kprobe_insn_slots = {
-- 
2.25.1