Commit 10b82d51 authored Sep 17, 2020 by Linus Torvalds

percpu

Pull percpu fix from Dennis Zhou:
 "This is a fix for the first chunk size calculation where the variable
  length array incorrectly used the number of longs instead of bytes of
  longs.

  This came in as a code fix and not a bug report, so I don't think it
  was widely problematic. I believe it worked out due to it being
  memblock memory and alignment requirements working in our favor"

* 'for-5.9-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu:
  percpu: fix first chunk size calculation for populated bitmap

parents 4c0449c9 b3b33d3c

mm/percpu.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1316,7 +1316,7 @@ static struct pcpu_chunk * __init pcpu_alloc_first_chunk(unsigned long tmp_addr,

		/* allocate chunk */
		alloc_size = sizeof(struct pcpu_chunk) +
		BITS_TO_LONGS(region_size >> PAGE_SHIFT);
		BITS_TO_LONGS(region_size >> PAGE_SHIFT) * sizeof(unsigned long);
		chunk = memblock_alloc(alloc_size, SMP_CACHE_BYTES);
		if (!chunk)
		panic("%s: Failed to allocate %zu bytes\n", __func__,

Admin message