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From: bugzilla@dpdk.org
To: dev@dpdk.org
Subject: [DPDK/core Bug 1853] Comment about /dev/zero in eal_common_memory.c
 is obsolete
Date: Thu, 18 Dec 2025 13:42:11 +0000
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http://bugs.dpdk.org/show_bug.cgi?id=3D1853

            Bug ID: 1853
           Summary: Comment about /dev/zero in eal_common_memory.c is
                    obsolete
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: core
          Assignee: dev@dpdk.org
          Reporter: marcel@telka.sk
  Target Milestone: ---

This comment is in lib/eal/common/eal_common_memory.c:

/*
 * Try to mmap *size bytes in /dev/zero. If it is successful, return the
 * pointer to the mmap'd area and keep *size unmodified. Else, retry
 * with a smaller zone: decrease *size by hugepage_sz until it reaches
 * 0. In this case, return NULL. Note: this function returns an address
 * which is a multiple of hugepage size.
 */


Unfortunately, the comment is no longer accurate.  The mmap-ing of *size by=
tes
in /dev/zero has been removed in April 2018 and since that the implementati=
on
is different.  The comment should be updated to reflect the current code.

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