libc: posix_fadvise: Fix build breakage for !LFS

commit 00571b43df2e "libc: posix_fadvise: restore implementation for xtensa"
enabled posix_fadvise() for all arches (it was just not generated
before).

However this also unearthed an issue introduced by ee84b8b400
"linux: posix_fadvise: use new SYSCALL_ALIGN_64BIT" which is to
referencing LFS'ish code (off64_t) w/o proper checks which causes build
to break for !LFS.

Fix this by calling posix_fadvise64() only for LFS case and open-code
it's equivalent for !LFS.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Baruch Siach <baruch@tkos.co.il>
Cc: Khem Raj <raj.khem@gmail.com>
Cc: markos Chandras <markos.chandras@gmail.com>
Cc: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

libc/sysdeps/linux/common/posix_fadvise.c

@@ -22,17 +22,34 @@
 # include <endian.h>
 # include <bits/wordsize.h>
 
-# ifdef __NR_fadvise64_64
-int posix_fadvise64(int fd, off64_t offset, off64_t len, int advice);
-# endif
+# if defined(__NR_fadvise64_64) && defined(__UCLIBC_HAS_LFS__)
+#include <_lfs_64.h>
 
+int posix_fadvise64(int fd, off64_t offset, off64_t len, int advice);
 int posix_fadvise(int fd, off_t offset, off_t len, int advice)
 {
-# ifdef __NR_fadvise64_64
 	return posix_fadvise64(fd, offset, len, advice);
-# else
+}
+#else
+
+int posix_fadvise(int fd, off_t offset, off_t len, int advice)
+{
 	int ret;
 	INTERNAL_SYSCALL_DECL(err);
+
+# ifdef __NR_fadvise64_64
+#  if __WORDSIZE == 64
+	ret = INTERNAL_SYSCALL(fadvise64_64, err, 4, fd, offset, len, advice);
+#  else
+#   if defined(__UCLIBC_SYSCALL_ALIGN_64BIT__) || defined(__arm__)
+	ret = INTERNAL_SYSCALL(fadvise64_64, err, 6, fd, advice,
+			OFF_HI_LO (offset), OFF_HI_LO (len));
+#   else
+	ret = INTERNAL_SYSCALL(fadvise64_64, err, 6, fd,
+			OFF_HI_LO (offset), OFF_HI_LO (len), advice);
+#   endif
+#  endif
+# else  /* __NR_fadvise64 */
 #  if __WORDSIZE == 64
 	ret = INTERNAL_SYSCALL(fadvise64, err, 4, fd, offset, len, advice);
 #  else
@@ -42,13 +59,14 @@ int posix_fadvise(int fd, off_t offset, off_t len, int advice)
 	ret = INTERNAL_SYSCALL(fadvise64, err, 5, fd,
 #   endif
 			OFF_HI_LO (offset), len, advice);
+#  endif
 #  endif
 	if (INTERNAL_SYSCALL_ERROR_P (ret, err))
 		return INTERNAL_SYSCALL_ERRNO (ret, err);
 	return 0;
-#  endif
 }
 # if defined __UCLIBC_HAS_LFS__ && (!defined __NR_fadvise64_64 || __WORDSIZE == 64)
 strong_alias(posix_fadvise,posix_fadvise64)
 # endif
 #endif
+#endif