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author | Cody P Schafer <cody@linux.vnet.ibm.com> | 2013-07-03 15:04:44 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-03 16:07:40 -0700 |
commit | 55878e88c59221c3187e1c24ec3b15eb79c374c0 (patch) | |
tree | f0c9a994d63b3fb64dffe6477317db53453b2b61 /Documentation/filesystems/xfs-delayed-logging-design.txt | |
parent | b26a3dfd4c0b888303a5909ef37febeb582e190e (diff) |
sparsemem: add BUILD_BUG_ON when sizeof mem_section is non-power-of-2
Instead of leaving a hidden trap for the next person who comes along and
wants to add something to mem_section, add a big fat warning about it
needing to be a power-of-2, and insert a BUILD_BUG_ON() in sparse_init()
to catch mistakes.
Right now non-power-of-2 mem_sections cause a number of WARNs at boot
(which don't clearly point to the size of mem_section as an issue), but
the system limps on (temporarily, at least).
This is based upon Dave Hansen's earlier RFC where he ran into the same
issue:
"sparsemem: fix boot when SECTIONS_PER_ROOT is not power-of-2"
http://lkml.indiana.edu/hypermail/linux/kernel/1205.2/03077.html
Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Jiang Liu <liuj97@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/filesystems/xfs-delayed-logging-design.txt')
0 files changed, 0 insertions, 0 deletions