[PATCH] Fix implicit declaration of 'in_irq' in linux/highmem.h

[Catalin Marinas]

Commit 3e4d3af introduced the kmap_atomic_idx_push() function which
warns on in_irq() with CONFIG_DEBUG_HIGHMEM enabled. This patch includes
linux/hardirq.h for the in_irq definition.

Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

Please ignore if the patch has already been posted.

 include/linux/highmem.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index e913819..b676c58 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -5,6 +5,7 @@
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/uaccess.h>
+#include <linux/hardirq.h>
 
 #include <asm/cacheflush.h>
 

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