x86_64: Fix readahead/sync_file_range/fadvise64 compat calls

Correctly convert the u64 arguments from 32bit to 64bit.

Pointed out by Heiko Carstens.

I guess this proves Linus' theory that nobody uses the more exotic Linux
specific syscalls.  It wasn't discovered by a user.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/arch/x86_64/ia32/sys_ia32.c b/arch/x86_64/ia32/sys_ia32.c
index 200fdde18d96..99a78a3cce7c 100644
--- a/arch/x86_64/ia32/sys_ia32.c
+++ b/arch/x86_64/ia32/sys_ia32.c
@@ -860,3 +860,22 @@ long sys32_lookup_dcookie(u32 addr_low, u32 addr_high,
 	return sys_lookup_dcookie(((u64)addr_high << 32) | addr_low, buf, len);
 }
 
+asmlinkage ssize_t sys32_readahead(int fd, unsigned off_lo, unsigned off_hi, size_t count)
+{
+	return sys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
+}
+
+asmlinkage long sys32_sync_file_range(int fd, unsigned off_low, unsigned off_hi,
+			   unsigned n_low, unsigned n_hi,  int flags)
+{
+	return sys_sync_file_range(fd,
+				   ((u64)off_hi << 32) | off_low,
+				   ((u64)n_hi << 32) | n_low, flags);
+}
+
+asmlinkage long sys32_fadvise64(int fd, unsigned offset_lo, unsigned offset_hi, size_t len,
+		     int advice)
+{
+	return sys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
+				len, advice);
+}