[CRIU] [PATCH 41/44] parasite-syscall.c: introduced the macro MMAP_OFFSET.

[Alexander Kartashov]

The macro is designated to convert an offset into a page frame number
on architectures that support the syscall sys_mmap2 but don't support sys_mmap.

Signed-off-by: Alexander Kartashov <alekskartashov at parallels.com>
---
 arch/x86/include/asm/parasite-syscall.h |    1 +
 parasite-syscall.c                      |    2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/parasite-syscall.h b/arch/x86/include/asm/parasite-syscall.h
index 9eec2ee..2df2329 100644
--- a/arch/x86/include/asm/parasite-syscall.h
+++ b/arch/x86/include/asm/parasite-syscall.h
@@ -4,6 +4,7 @@
 
 #define ARCH_SI_TRAP SI_KERNEL
 
+#define MMAP_OFFSET(offset) offset
 
 extern const char code_syscall[];
 extern const int code_syscall_size;
diff --git a/parasite-syscall.c b/parasite-syscall.c
index 6db9422..0ba5439 100644
--- a/parasite-syscall.c
+++ b/parasite-syscall.c
@@ -238,7 +238,7 @@ static void *mmap_seized(struct parasite_ctl *ctl,
 	int err;
 
 	err = syscall_seized(ctl, __NR_mmap, &map,
-			(unsigned long)addr, length, prot, flags, fd, offset);
+			(unsigned long)addr, length, prot, flags, fd, MMAP_OFFSET(offset));
 	if (err < 0 || (long)map < 0)
 		map = 0;
 
-- 
1.7.10.4