[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20200724050553.1724168-3-jarkko.sakkinen@linux.intel.com>
Date: Fri, 24 Jul 2020 08:05:49 +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>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH v5 2/6] vmalloc: Add text_alloc() and text_free()
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@...ck.org
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Suggested-by: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.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
Powered by blists - more mailing lists