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Subject[PATCH 3.2 54/87] dma-debug: switch check from _text to _stext
3.2.77-rc1 review patch.  If anyone has any objections, please let me know.


From: Laura Abbott <>

commit ea535e418c01837d07b6c94e817540f50bfdadb0 upstream.

In include/asm-generic/sections.h:

* Usage guidelines:
* _text, _data: architecture specific, don't use them in
* arch-independent code
* [_stext, _etext]: contains .text.* sections, may also contain
* .rodata.*
* and/or .init.* sections

_text is not guaranteed across architectures. Architectures such as ARM
may reuse parts which are not actually text and erroneously trigger a bug.
Switch to using _stext which is guaranteed to contain text sections.

Came out of<>

Signed-off-by: Laura Abbott <>
Reviewed-by: Kees Cook <>
Cc: Russell King <>
Cc: Arnd Bergmann <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
Signed-off-by: Ben Hutchings <>
lib/dma-debug.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -942,7 +942,7 @@ static inline bool overlap(void *addr, u

static void check_for_illegal_area(struct device *dev, void *addr, unsigned long len)
- if (overlap(addr, len, _text, _etext) ||
+ if (overlap(addr, len, _stext, _etext) ||
overlap(addr, len, __start_rodata, __end_rodata))
err_printk(dev, NULL, "DMA-API: device driver maps memory from kernel text or rodata [addr=%p] [len=%lu]\n", addr, len);
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