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    Subject[PATCH] checkpatch: Check for %L for all integer formats (was: Re: [PATCH] fix printk format compiler warnings)
    On Fri, 5 Sep 2008, Jan Beulich wrote:
    > %llx and the like cannot be used on u64-derived data types - they must
    > be cast to long long explicitly for arch-es where u64 is a typedef of
    > unsigned long (ia64 is where I observed the problem).

    > - printk(KERN_INFO "PCI: bridge %s io port: [%llx, %llx]\n", pci_name(dev), res->start, res->end);
    > + printk(KERN_INFO "PCI: bridge %s io port: [%Lx, %Lx]\n",

    > - printk(KERN_INFO "PCI: bridge %s 32bit mmio: [%llx, %llx]\n", pci_name(dev), res->start, res->end);
    > + printk(KERN_INFO "PCI: bridge %s 32bit mmio: [%Lx, %Lx]\n",

    > - printk(KERN_INFO "PCI: bridge %s %sbit mmio pref: [%llx, %llx]\n", pci_name(dev), (res->flags & PCI_PREF_RANGE_TYPE_64)?"64":"32",res->start, res->end);
    > + printk(KERN_INFO "PCI: bridge %s %dbit mmio pref: [%Lx, %Lx]\n",

    > - printk(KERN_INFO "bus: %02x index %x %s: [%llx, %llx]\n", bus->number, i, (res->flags & IORESOURCE_IO)? "io port":"mmio", res->start, res->end);
    > + printk(KERN_INFO "bus: %02x index %x %s: [%Lx, %Lx]\n",

    Why did you replace `%ll' by `%L'?

    While `L' is used as an internal flag in Linux' vsnprintf() implementation and
    is still supported because of historical (pre-C99) reasons, the `L' conversion
    qualifier is meant for the `long double' floating point type, as per C99.
    The recommended conversion qualifier for the `long long' integer type is `ll'.

    Perhaps checkpatch should check for this? Ah, it already does for some of the
    integer formats. The patch below adds checks for the missing ones.

    Subject: [PATCH] checkpatch: Check for %L for all integer formats

    Checkpatch checks for the use of the non-standard `L' conversion qualifier for
    some (`u', `d', and `i') of the 6 integers formats. Add the missing ones
    (`o', `x', and `X'), and keep the list sorted.

    Signed-off-by: Geert Uytterhoeven <>

    diff --git a/scripts/ b/scripts/
    index bc67793..92cbf5e 100755
    --- a/scripts/
    +++ b/scripts/
    @@ -2277,12 +2277,12 @@ sub process {
    WARN("usage of NR_CPUS is often wrong - consider using cpu_possible(), num_possible_cpus(), for_each_possible_cpu(), etc\n" . $herecurr);

    -# check for %L{u,d,i} in strings
    +# check for %L{d,i,o,u,x,X} in strings
    my $string;
    while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
    $string = substr($rawline, $-[1], $+[1] - $-[1]);
    - if ($string =~ /(?<!%)%L[udi]/) {
    - WARN("\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
    + if ($string =~ /(?<!%)%L[diouxX]/) {
    + WARN("\%L[diouxX] are not-standard C, use %ll[diouxX]\n" . $herecurr);

    With kind regards,

    Geert Uytterhoeven
    Software Architect

    Sony Techsoft Centre Europe
    The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium

    Phone: +32 (0)2 700 8453
    Fax: +32 (0)2 700 8622

    A division of Sony Europe (Belgium) N.V.
    VAT BE 0413.825.160 · RPR Brussels
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      Last update: 2008-09-30 13:33    [W:0.021 / U:106.828 seconds]
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