From: Barry Song <barry.song@analog.com>
Date: Tue, 29 Jun 2010 08:43:38 +0000 (+0000)
Subject: Blackfin: access_ok: permit L1 stack
X-Git-Url: http://rtime.felk.cvut.cz/gitweb/lisovros/linux_canprio.git/commitdiff_plain/41c3e3346ab8e5caf9e76395bd812fac884ad371

Blackfin: access_ok: permit L1 stack

When apps run with their stack in L1, some system calls might be made
where a buffer is in the stack as an argument.  So make sure the core
Blackfin access code does not reject this memory location.

Signed-off-by: Barry Song <barry.song@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
---

diff --git a/arch/blackfin/kernel/process.c b/arch/blackfin/kernel/process.c
index c86a3ed5f48..cd0c090ebc5 100644
--- a/arch/blackfin/kernel/process.c
+++ b/arch/blackfin/kernel/process.c
@@ -493,6 +493,11 @@ int _access_ok(unsigned long addr, unsigned long size)
 		return 1;
 #endif
 
+#ifndef CONFIG_EXCEPTION_L1_SCRATCH
+	if (in_mem_const(addr, size, (unsigned long)l1_stack_base, l1_stack_len))
+		return 1;
+#endif
+
 	aret = in_async(addr, size);
 	if (aret < 2)
 		return aret;