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From: Jarkko Lavinen on 20 Jan 2010 10:30
Swapon wastes one page of swap space to no effect.

Mkswap stores the value 'pages - 1' into last_page field, where pages is the
partition size in pages. When nr_good_pages is calculated, last_page + 1
should be used for the number of all the pages header included.

Signed-off-by: Jarkko Lavinen <jarkko.lavinen(a)nokia.com>
---
mm/swapfile.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 6c0585b..50d90ca 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1961,7 +1961,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
if (error)
goto bad_swap;

- nr_good_pages = swap_header->info.last_page -
+ nr_good_pages = swap_header->info.last_page + 1 -
swap_header->info.nr_badpages -
1 /* header page */;

--
1.6.5

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Prev: [PATCH] Obsolete config in kernel source (USB_HCD_DMA)
Next: : bug fix, remove partial zero out