There is no room to adjust 'atom_size' now when a generic percpu area
is used. It would be redundant to write down an architecture-specific
setup_per_cpu_areas() in order to only change the 'atom_size'. Thus,
this patch adds a new definition, PERCPU_ATOM_SIZE, which is PAGE_SIZE
by default. The value could be updated if needed by architecture.
Signed-off-by: Jungseok Lee <jungseoklee85@xxxxxxxxx>
---
include/linux/percpu.h | 4 ++++
mm/percpu.c | 6 +++---
2 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index 4bc6daf..57a2f16 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -18,6 +18,10 @@
#define PERCPU_MODULE_RESERVE 0
#endif
+#ifndef PERCPU_ATOM_SIZE
+#define PERCPU_ATOM_SIZE PAGE_SIZE
+#endif
+
/* minimum unit size, also is the maximum supported allocation size */
#define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10)
diff --git a/mm/percpu.c b/mm/percpu.c
index a63b4d8..cd1e0ec 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -2201,8 +2201,8 @@ void __init setup_per_cpu_areas(void)
* what the legacy allocator did.
*/
rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
- PERCPU_DYNAMIC_RESERVE, PAGE_SIZE, NULL,
- pcpu_dfl_fc_alloc, pcpu_dfl_fc_free);
+ PERCPU_DYNAMIC_RESERVE, PERCPU_ATOM_SIZE,
+ NULL, pcpu_dfl_fc_alloc, pcpu_dfl_fc_free);
if (rc < 0)
panic("Failed to initialize percpu areas.");
@@ -2231,7 +2231,7 @@ void __init setup_per_cpu_areas(void)
ai = pcpu_alloc_alloc_info(1, 1);
fc = memblock_virt_alloc_from_nopanic(unit_size,
- PAGE_SIZE,
+ PERCPU_ATOM_SIZE,
__pa(MAX_DMA_ADDRESS));
if (!ai || !fc)
panic("Failed to allocate memory for percpu areas.");
--
2.5.0
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