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mm/memblock.c: warn if zero alignment was requested

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After updating all memblock users to explicitly specify SMP_CACHE_BYTES
alignment rather than use 0, it is still possible that uncovered users may
sneak in.  Add a WARN_ON_ONCE for such cases.

[sfr@canb.auug.org.au: use dump_stack() instead of WARN_ON_ONCE for the alignment checks]
  Link: http://lkml.kernel.org/r/20181016131927.6ceba6ab@canb.auug.org.au
[akpm@linux-foundation.org: add apologetic comment]
Link: http://lkml.kernel.org/r/20181011060850.GA19822@rapoport-lnx
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Rapoport 2018-10-30 15:10:01 -07:00 committed by Linus Torvalds
parent 7e1c4e2792
commit 2f770806fd
1 changed files with 11 additions and 0 deletions
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11
mm/memblock.c
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@ -1247,6 +1247,12 @@ static phys_addr_t __init memblock_alloc_range_nid(phys_addr_t size,
{ {
phys_addr_t found; phys_addr_t found;
if (!align) {
/* Can't use WARNs this early in boot on powerpc */
dump_stack();
align = SMP_CACHE_BYTES;
}
found = memblock_find_in_range_node(size, align, start, end, nid, found = memblock_find_in_range_node(size, align, start, end, nid,
flags); flags);
if (found && !memblock_reserve(found, size)) { if (found && !memblock_reserve(found, size)) {
@ -1369,6 +1375,11 @@ static void * __init memblock_alloc_internal(
if (WARN_ON_ONCE(slab_is_available())) if (WARN_ON_ONCE(slab_is_available()))
return kzalloc_node(size, GFP_NOWAIT, nid); return kzalloc_node(size, GFP_NOWAIT, nid);
if (!align) {
dump_stack();
align = SMP_CACHE_BYTES;
}
if (max_addr > memblock.current_limit) if (max_addr > memblock.current_limit)
max_addr = memblock.current_limit; max_addr = memblock.current_limit;
again: again: