[lkml]   [2003]   [Sep]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Subjectdiv64.h:do_div() bug
I've found that a bug in asm-arm/div64.h:do_div() is preventing correct
conversion of timestamps in smbfs (and probably ntfs as well) from NT to
Unix format. I'll post a patch that fixes the bug, but I think it is also
present in other architectures - at least SPARC, SH, and CRIS look

If people with access to these architectures could run the following small
test and let me know the outcome, I can fix it there too - thanks.

#define __KERNEL__
#include <asm/types.h> // get kernel definition of u64, u32
#undef __KERNEL__
#include <asm/div64.h> // get definition of do_div()
#include <stdio.h>

main () {
union {
u64 n64;
u32 n32[2];
} in, out;

in.n32[0] = 1;
in.n32[1] = 1;
out = in;

do_div(out.n64, 1);

if (in.n64 != out.n64) {
printf("FAILURE: asm/div64.h:do_div() is broken for 64-bit dividends\n");
} else {
printf("Congratulations: asm/div64.h:do_div() handles 64-bit dividends\n");
return 0;
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:48    [W:0.057 / U:1.876 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site