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-rw-r--r--mm/percpu.c31
1 files changed, 28 insertions, 3 deletions
diff --git a/mm/percpu.c b/mm/percpu.c
index 46485e1b26fc..6470e7710231 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -229,8 +229,8 @@ static int __maybe_unused pcpu_page_idx(unsigned int cpu, int page_idx)
return pcpu_unit_map[cpu] * pcpu_unit_pages + page_idx;
}
-static unsigned long __maybe_unused pcpu_chunk_addr(struct pcpu_chunk *chunk,
- unsigned int cpu, int page_idx)
+static unsigned long pcpu_chunk_addr(struct pcpu_chunk *chunk,
+ unsigned int cpu, int page_idx)
{
return (unsigned long)chunk->base_addr + pcpu_unit_offsets[cpu] +
(page_idx << PAGE_SHIFT);
@@ -978,7 +978,32 @@ bool is_kernel_percpu_address(unsigned long addr)
*/
phys_addr_t per_cpu_ptr_to_phys(void *addr)
{
- if (pcpu_addr_in_first_chunk(addr)) {
+ void __percpu *base = __addr_to_pcpu_ptr(pcpu_base_addr);
+ bool in_first_chunk = false;
+ unsigned long first_start, first_end;
+ unsigned int cpu;
+
+ /*
+ * The following test on first_start/end isn't strictly
+ * necessary but will speed up lookups of addresses which
+ * aren't in the first chunk.
+ */
+ first_start = pcpu_chunk_addr(pcpu_first_chunk, pcpu_first_unit_cpu, 0);
+ first_end = pcpu_chunk_addr(pcpu_first_chunk, pcpu_last_unit_cpu,
+ pcpu_unit_pages);
+ if ((unsigned long)addr >= first_start &&
+ (unsigned long)addr < first_end) {
+ for_each_possible_cpu(cpu) {
+ void *start = per_cpu_ptr(base, cpu);
+
+ if (addr >= start && addr < start + pcpu_unit_size) {
+ in_first_chunk = true;
+ break;
+ }
+ }
+ }
+
+ if (in_first_chunk) {
if ((unsigned long)addr < VMALLOC_START ||
(unsigned long)addr >= VMALLOC_END)
return __pa(addr);