arm64: cmpxchg: Don't incldue linux/mmdebug.h

The arm64 asm/cmpxchg.h includes linux/mmdebug.h but doesn't so far as I
can tell actually use anything from it.  Removing the inclusion reduces
spurious header dependency rebuilds and also avoids issues with
recursive inclusions of headers causing build breaks due to attempts to
use things before they are defined if linux/mmdebug.h starts pulling in
more low level headers.

Such errors have happened in -next recently, for example:

In file included from include/linux/completion.h:11:0,
                 from include/linux/rcupdate.h:43,
                 from include/linux/tracepoint.h:19,
                 from include/linux/mmdebug.h:6,
                 from ./arch/arm64/include/asm/cmpxchg.h:22,
                 from ./arch/arm64/include/asm/atomic.h:41,
                 from include/linux/atomic.h:4,
                 from include/linux/spinlock.h:406,
                 from include/linux/seqlock.h:35,
                 from include/linux/time.h:5,
                 from include/uapi/linux/timex.h:56,
                 from include/linux/timex.h:56,
                 from include/linux/sched.h:19,
                 from arch/arm64/kernel/asm-offsets.c:21:
include/linux/wait.h: In function 'wait_on_atomic_t':
include/linux/wait.h:1218:2: error: implicit declaration of function 'atomic_read' [-Werror=implicit-function-declaration]
 if (atomic_read(val) == 0)

Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
(cherry picked from commit 4a6ccf30263f4e265c0f171561bf4c40bed5f273)
Signed-off-by: Alex Shi <alex.shi@linaro.org>

diff --git a/arch/arm64/include/asm/cmpxchg.h b/arch/arm64/include/asm/cmpxchg.h
index 9ea611ea69df739009d0a6d432bbbedcab05284b..510c7b4044547f82750ca9295e6d35bdeb0b67bf 100644 (file)
--- a/arch/arm64/include/asm/cmpxchg.h
+++ b/arch/arm64/include/asm/cmpxchg.h
@@ -19,7 +19,6 @@
 #define __ASM_CMPXCHG_H
 
 #include <linux/bug.h>
-#include <linux/mmdebug.h>
 
 #include <asm/atomic.h>
 #include <asm/barrier.h>