linux-kernel - Re: [PATCH -next] mm/hugetlb.c: fix printk format warning for 32-bit phys_addr

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Message-ID: <be55765b11f925f15f338152399923e169a20f53.camel@perches.com>
Date:   Wed, 18 Mar 2020 19:37:58 -0700
From:   Joe Perches <joe@...ches.com>
To:     Randy Dunlap <rdunlap@...radead.org>,
        Linux MM <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] mm/hugetlb.c: fix printk format warning for
 32-bit phys_addr_t

On Wed, 2020-03-18 at 19:11 -0700, Randy Dunlap wrote:
> On 3/18/20 7:04 PM, Joe Perches wrote:
> > On Wed, 2020-03-18 at 14:33 -0700, Randy Dunlap wrote:
> > > From: Randy Dunlap <rdunlap@...radead.org>
> > > 
> > > Fix printk format warnings when phys_addr_t is 32 bits, i.e.,
> > > CONFIG_PHYS_ADDR_T_64BIT is not set/enabled.
> > []
> > > ../mm/hugetlb.c:5472:73: note: format string is defined here
> > >     pr_warn("hugetlb_cma: reservation failed: err %d, node %d, [%llu, %llu)",
> > >                                                                       ~~~^
> > []
> > > --- linux-next-20200318.orig/mm/hugetlb.c
> > > +++ linux-next-20200318/mm/hugetlb.c
> > > @@ -5469,8 +5469,10 @@ void __init hugetlb_cma_reserve(int orde
> > >  					     0, false,
> > >  					     "hugetlb", &hugetlb_cma[nid]);
> > >  		if (res) {
> > > -			pr_warn("hugetlb_cma: reservation failed: err %d, node %d, [%llu, %llu)",
> > > -				res, nid, PFN_PHYS(min_pfn), PFN_PHYS(max_pfn));
> > > +			phys_addr_t begpa = PFN_PHYS(min_pfn);
> > > +			phys_addr_t endpa = PFN_PHYS(max_pfn);
> > > +			pr_warn("hugetlb_cma: reservation failed: err %d, node %d, [%pap, %pap)",
> > > +				res, nid, &begpa, &endpa);
> > 
> > You might correct the odd use of an open bracket
> > then close parenthesis and add a new line too
> 
> Definitely needs a newline char.
> 
> I'm fairly sure that the [begin, end) notation is done on purpose, meaning
> <begin> is included in the range and <end> is not included in the range.

OK, that seems a pretty obscure and not obvious use of
interval notation, at least to me. (18 uses treewide ?)

Maybe it could be documented somewhere?

It's an odd pattern to grep.  Maybe I missed some.

$ git grep -P '".*[\[\{]\s*%\d*[ldux]+\s*[/:,\.\-]?\s*%\d*[ldux]+\).*"'
arch/x86/kernel/alternative.c:  DUMP_BYTES(instr, a->instrlen, "%px: [%d:%d) optimized NOPs: ",
drivers/clk/qcom/clk-alpha-pll.c:               pr_err("%s: Rounded rate %lu not within range [%lu, %lu)\n",
fs/ext4/extents_status.c:               printk(KERN_DEBUG " [%u/%u) %llu %x",
fs/ext4/extents_status.c:                       es_debug("%u cached by [%u/%u) %llu %x\n",
fs/ext4/extents_status.c:       es_debug("add [%u/%u) %llu %x to extent status tree of inode %lu\n",
fs/ext4/extents_status.c:                       es_debug("%u cached by [%u/%u)\n",
fs/ext4/extents_status.c:       es_debug("remove [%u/%u) from extent status tree of inode %lu\n",
fs/nilfs2/cpfile.c:                       "cannot delete checkpoints: invalid range [%llu, %llu)",
fs/nilfs2/dat.c:                          "%s: invalid vblocknr = %llu, [%llu, %llu)",
include/trace/events/ext4.h:    TP_printk("dev %d,%d ino %lu es [%u/%u) mapped %llu status %s",
include/trace/events/ext4.h:    TP_printk("dev %d,%d ino %lu es [%lld/%lld)",
include/trace/events/ext4.h:    TP_printk("dev %d,%d ino %lu es [%u/%u) mapped %llu status %s",
include/trace/events/ext4.h:    TP_printk("dev %d,%d ino %lu found %d [%u/%u) %llu %s",
include/trace/events/ext4.h:    TP_printk("dev %d,%d ino %lu es [%u/%u) mapped %llu status %s "
mm/hugetlb.c:                   pr_warn("hugetlb_cma: reservation failed: err %d, node %d, [%llu, %llu)",
mm/kasan/report.c:              pr_err(" [%lu, %lu) '%s'", offset, offset + size, token);
mm/page_alloc.c:                pr_info_ratelimited("%s: [%lx, %lx) PFNs busy\n",
tools/testing/selftests/kvm/demand_paging_test.c:               PER_VCPU_DEBUG("Added VCPU %d with test mem gpa [%lx, %lx)\n",