linux-kernel - [BUGFIX PATCH 1/5] selftests: proc: Make va

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Date:   Tue,  8 Oct 2019 00:10:26 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Shuah Khan <shuah@...nel.org>
Cc:     linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        jaswinder.singh@...aro.org, Alexey Dobriyan <adobriyan@...il.com>
Subject: [BUGFIX PATCH 1/5] selftests: proc: Make va_max 3GB on 32bit arch

Currently proc-self-map-files-002.c sets va_max (max test address
of user virtual address) to 4GB, but it is too big for 32bit
arch and 1UL << 32 is overflow on 32bit long.

Make va_max 3GB on 32bit arch like i386 and arm.

Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Alexey Dobriyan <adobriyan@...il.com>
---
 .../selftests/proc/proc-self-map-files-002.c       |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/proc/proc-self-map-files-002.c b/tools/testing/selftests/proc/proc-self-map-files-002.c
index 47b7473dedef..d517f8c479fb 100644
--- a/tools/testing/selftests/proc/proc-self-map-files-002.c
+++ b/tools/testing/selftests/proc/proc-self-map-files-002.c
@@ -22,6 +22,7 @@
 #include <unistd.h>
 #include <sys/mman.h>
 #include <stdlib.h>
+#include <asm/bitsperlong.h>
 
 static void pass(const char *fmt, unsigned long a, unsigned long b)
 {
@@ -44,10 +45,18 @@ static void fail(const char *fmt, unsigned long a, unsigned long b)
 	exit(1);
 }
 
+#if __BITS_PER_LONG == 32
+# define VA_MAX (3UL << 30)
+#elif __BITS_PER_LONG == 64
+# define VA_MAX (1UL << 32)
+#else
+# define VA_MAX 0
+#endif
+
 int main(void)
 {
 	const int PAGE_SIZE = sysconf(_SC_PAGESIZE);
-	const unsigned long va_max = 1UL << 32;
+	const unsigned long va_max = VA_MAX;
 	unsigned long va;
 	void *p;
 	int fd;