#ifndef IPV4_H #define IPV4_H #include #include "built_in.h" struct ipv4hdr { #if defined(__LITTLE_ENDIAN_BITFIELD) __extension__ uint8_t h_ihl:4, h_version:4; #elif defined (__BIG_ENDIAN_BITFIELD) __extension__ uint8_t h_version:4, h_ihl:4; #else # error "Please fix " #endif uint8_t h_tos; uint16_t h_tot_len; uint16_t h_id; uint16_t h_frag_off; uint8_t h_ttl; uint8_t h_protocol; uint16_t h_check; uint32_t h_saddr; uint32_t h_daddr; } __packed; #endif /* IPV4_H */ stanz.ch/cgit.cgi/linux/net-next.git' title='net-next.git Git repository'/>
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authorDan Williams <dan.j.williams@intel.com>2016-09-03 10:38:03 -0700
committerDan Williams <dan.j.williams@intel.com>2016-09-09 17:34:45 -0700
commitca120cf688874f4423e579e7cc5ddf7244aeca45 (patch)
tree84f2c360519322e74fa72d1f3754f01d864a43a4
parent4c3cb6e9a9d94d1553807854a565cd27ff4c22aa (diff)
mm: fix show_smap() for zone_device-pmd ranges
Attempting to dump /proc/<pid>/smaps for a process with pmd dax mappings currently results in the following VM_BUG_ONs: kernel BUG at mm/huge_memory.c:1105! task: ffff88045f16b140 task.stack: ffff88045be14000 RIP: 0010:[<ffffffff81268f9b>] [<ffffffff81268f9b>] follow_trans_huge_pmd+0x2cb/0x340 [..] Call Trace: [<ffffffff81306030>] smaps_pte_range+0xa0/0x4b0 [<ffffffff814c2755>] ? vsnprintf+0x255/0x4c0 [<ffffffff8123c46e>] __walk_page_range+0x1fe/0x4d0 [<ffffffff8123c8a2>] walk_page_vma+0x62/0x80 [<ffffffff81307656>] show_smap+0xa6/0x2b0 kernel BUG at fs/proc/task_mmu.c:585! RIP: 0010:[<ffffffff81306469>] [<ffffffff81306469>] smaps_pte_range+0x499/0x4b0 Call Trace: [<ffffffff814c2795>] ? vsnprintf+0x255/0x4c0 [<ffffffff8123c46e>] __walk_page_range+0x1fe/0x4d0 [<ffffffff8123c8a2>] walk_page_vma+0x62/0x80 [<ffffffff81307696>] show_smap+0xa6/0x2b0 These locations are sanity checking page flags that must be set for an anonymous transparent huge page, but are not set for the zone_device pages associated with dax mappings. Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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