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authorMiles Chen <miles.chen@mediatek.com>2021-09-02 14:57:13 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-09-03 09:58:14 -0700
commitbdbda735508ca83341899a77f143e4d5c58007b3 (patch)
tree57128ca5fe6b698348ab0383d2ff25aa5a5a0a05 /mm/sparse.c
parente0dbb2bccf19ce5e870afb420a3d0480c582bb7b (diff)
mm/sparse: clarify pgdat_to_phys
Clarify pgdat_to_phys() by testing if pgdat == &contig_page_data when CONFIG_NUMA=n. We only expect contig_page_data in such case, so we use &contig_page_data directly instead of pgdat. No functional change intended when CONFIG_BUG_VM=n. Comment from Mark [1]: " ... and I reckon it'd be clearer and more robust to define pgdat_to_phys() in the same ifdefs as contig_page_data so that these, stay in-sync. e.g. have: | #ifdef CONFIG_NUMA | #define pgdat_to_phys(x) virt_to_phys(x) | #else /* CONFIG_NUMA */ | | extern struct pglist_data contig_page_data; | ... | #define pgdat_to_phys(x) __pa_symbol(&contig_page_data) | | #endif /* CONIFIG_NUMA */ " [1] https://lore.kernel.org/linux-arm-kernel/20210615131902.GB47121@C02TD0UTHF1T.local/ Link: https://lkml.kernel.org/r/20210723123342.26406-1-miles.chen@mediatek.com Signed-off-by: Miles Chen <miles.chen@mediatek.com> Reviewed-by: David Hildenbrand <david@redhat.com> Acked-by: Mike Rapoport <rppt@linux.ibm.com> Cc: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/sparse.c')
-rw-r--r--mm/sparse.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/sparse.c b/mm/sparse.c
index be7936e65b6a..fd29b3abffa0 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -321,7 +321,8 @@ size_t mem_section_usage_size(void)
static inline phys_addr_t pgdat_to_phys(struct pglist_data *pgdat)
{
#ifndef CONFIG_NUMA
- return __pa_symbol(pgdat);
+ VM_BUG_ON(pgdat != &contig_page_data);
+ return __pa_symbol(&contig_page_data);
#else
return __pa(pgdat);
#endif