Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
IronPort-SDR: h7T7qyBMr7Vqb84TmknVje3wHUbyMgfWYn5dlZcg0XuuIGvkQiBm7puGpQYU+rzeSqar5saUFb
 jm7HLl2UUDNQ==
IronPort-SDR: qY/icntTHNX8zoRFkoNoJ9PavRZVse1JH+1/o2alo5VC1HFLRyNHZrsE1xfYPp1L/E2n4a6MXl
 Bw89swfNwqww==
From:   Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To:     linux-kernel@vger.kernel.org
Cc:     Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
        linux-mm@kvack.org, Andi Kleen <ak@linux.intel.com>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Andrew Morton <akpm@linux-foundation.org>
Subject: [PATCH v5 2/6] vmalloc: Add text_alloc() and text_free()
Date:   Fri, 24 Jul 2020 08:04:56 +0300
Message-Id: <20200724050501.1723315-3-jarkko.sakkinen@linux.intel.com>
In-Reply-To: <20200724050501.1723315-1-jarkko.sakkinen@linux.intel.com>
References: <20200724050501.1723315-1-jarkko.sakkinen@linux.intel.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Introduce functions for allocating memory for dynamic trampolines, such
as kprobes. An arch can promote the availability of these functions with
CONFIG_ARCH_HAS_TEXT_ALLOC.

Cc: linux-mm@kvack.org
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 include/linux/vmalloc.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 0221f852a7e1..6c151a0ac02a 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -249,4 +249,21 @@ pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
 int register_vmap_purge_notifier(struct notifier_block *nb);
 int unregister_vmap_purge_notifier(struct notifier_block *nb);
 
+/*
+ * These functions can be optionally implemented by an arch in order to
+ * provide specialized functions for allocating trampoline code.
+ */
+
+#ifdef CONFIG_ARCH_HAS_TEXT_ALLOC
+/*
+ * Allocate memory to be used for trampoline code.
+ */
+void *text_alloc(unsigned long size);
+
+/*
+ * Free memory returned from text_alloc().
+ */
+void text_free(void *region);
+#endif /* CONFIG_ARCH_HAS_TEXT_ALLOC */
+
 #endif /* _LINUX_VMALLOC_H */
-- 
2.25.1