On Tue, May 18, 2021 at 06:25:28PM +0800, Dong Aisheng wrote: > On Tue, May 18, 2021 at 6:09 PM Mike Rapoport <rppt@xxxxxxxxxx> wrote: > > > > On Mon, May 17, 2021 at 07:20:41PM +0800, Dong Aisheng wrote: > > > Free section usage memory in case populate_section_memmap failed. > > > We use map_count to track the remain unused memory to be freed. > > > > > > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > > > Signed-off-by: Dong Aisheng <aisheng.dong@xxxxxxx> > > > --- > > > mm/sparse.c | 2 ++ > > > 1 file changed, 2 insertions(+) > > > > > > diff --git a/mm/sparse.c b/mm/sparse.c > > > index 7ac481353b6b..98bfacc763da 100644 > > > --- a/mm/sparse.c > > > +++ b/mm/sparse.c > > > @@ -549,12 +549,14 @@ static void __init sparse_init_nid(int nid, unsigned long pnum_begin, > > > __func__, nid); > > > pnum_begin = pnum; > > > sparse_buffer_fini(); > > > + memblock_free_early(__pa(usage), map_count * mem_section_usage_size()); > > > > I'd move both sparse_buffer_fini() and freeing of 'usage' memory after the > > failed label. > > > > Doing that needs to introduce another 'failed' label. > Do you think if it's necessary? In general, it's preferred way of error handling: https://www.kernel.org/doc/html/latest/process/coding-style.html#centralized-exiting-of-functions > e.g. > diff --git a/mm/sparse.c b/mm/sparse.c > index 7ac481353b6b..408b737e168e 100644 > --- a/mm/sparse.c > +++ b/mm/sparse.c > @@ -533,7 +533,7 @@ static void __init sparse_init_nid(int nid, > unsigned long pnum_begin, > mem_section_usage_size() * map_count); > if (!usage) { > pr_err("%s: node[%d] usemap allocation failed", __func__, nid); > - goto failed; > + goto failed1; > } > sparse_buffer_init(map_count * section_map_size(), nid); > for_each_present_section_nr(pnum_begin, pnum) { > @@ -548,17 +548,20 @@ static void __init sparse_init_nid(int nid, > unsigned long pnum_begin, > pr_err("%s: node[%d] memory map backing > failed. Some memory will not be available.", > __func__, nid); > pnum_begin = pnum; > - sparse_buffer_fini(); > - goto failed; > + goto failed2; > } > check_usemap_section_nr(nid, usage); > sparse_init_one_section(__nr_to_section(pnum), pnum, map, usage, > SECTION_IS_EARLY); > usage = (void *) usage + mem_section_usage_size(); > + map_count--; > } > sparse_buffer_fini(); > return; > -failed: > +failed2: > + sparse_buffer_fini(); > + memblock_free_early(__pa(usage), map_count * mem_section_usage_size()); > +failed1: > /* We failed to allocate, mark all the following pnums as not present */ > for_each_present_section_nr(pnum_begin, pnum) { > struct mem_section *ms; > > Regards > Aisheng > > > goto failed; > > > } > > > check_usemap_section_nr(nid, usage); > > > sparse_init_one_section(__nr_to_section(pnum), pnum, map, usage, > > > SECTION_IS_EARLY); > > > usage = (void *) usage + mem_section_usage_size(); > > > + map_count--; > > > } > > > sparse_buffer_fini(); > > > return; > > > -- > > > 2.25.1 > > > > > > > > > > -- > > Sincerely yours, > > Mike. -- Sincerely yours, Mike.
