Commit 97c7134a authored Nov 10, 2014 by Kevin Cernekee Committed by Steve French Dec 14, 2014

Fix signed/unsigned pointer warning



Commit 2ae83bf9 ("[CIFS] Fix setting time before epoch (negative
time values)") changed "u64 t" to "s64 t", which makes do_div() complain
about a pointer signedness mismatch:

      CC      fs/cifs/netmisc.o
    In file included from ./arch/mips/include/asm/div64.h:12:0,
                     from include/linux/kernel.h:124,
                     from include/linux/list.h:8,
                     from include/linux/wait.h:6,
                     from include/linux/net.h:23,
                     from fs/cifs/netmisc.c:25:
    fs/cifs/netmisc.c: In function ‘cifs_NTtimeToUnix’:
    include/asm-generic/div64.h:43:28: warning: comparison of distinct pointer types lacks a cast [enabled by default]
      (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \
                                ^
    fs/cifs/netmisc.c:941:22: note: in expansion of macro ‘do_div’
       ts.tv_nsec = (long)do_div(t, 10000000) * 100;

Introduce a temporary "u64 abs_t" variable to fix this.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Signed-off-by: Steve French <steve.french@primarydata.com>

parent 9235d098

fs/cifs/netmisc.c

+7 −5

Original line number	Diff line number	Diff line
		@@ -926,6 +926,7 @@ cifs_NTtimeToUnix(__le64 ntutc)

		/* Subtract the NTFS time offset, then convert to 1s intervals. */
		s64 t = le64_to_cpu(ntutc) - NTFS_TIME_OFFSET;
		u64 abs_t;

		/*
		* Unfortunately can not use normal 64 bit division on 32 bit arch, but
		@@ -933,13 +934,14 @@ cifs_NTtimeToUnix(__le64 ntutc)
		* to special case them
		*/
		if (t < 0) {
		t = -t;
		ts.tv_nsec = (long)(do_div(t, 10000000) * 100);
		abs_t = -t;
		ts.tv_nsec = (long)(do_div(abs_t, 10000000) * 100);
		ts.tv_nsec = -ts.tv_nsec;
		ts.tv_sec = -t;
		ts.tv_sec = -abs_t;
		} else {
		ts.tv_nsec = (long)do_div(t, 10000000) * 100;
		ts.tv_sec = t;
		abs_t = t;
		ts.tv_nsec = (long)do_div(abs_t, 10000000) * 100;
		ts.tv_sec = abs_t;
		}

		return ts;