From: xiongxin xiongxin@kylinos.cn
The actual calculation formula in the code below is:
max_size = (count - (size + PAGES_FOR_IO)) / 2 - 2 * DIV_ROUND_UP(reserved_size, PAGE_SIZE);
But function comments are written differently, the comment is wrong?
By the way, what exactly do the "/ 2" and "2 *" mean?
Cc: stable@vger.kernel.org Signed-off-by: xiongxin xiongxin@kylinos.cn --- kernel/power/snapshot.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c index 2a406753af90..c20ca5fb9adc 100644 --- a/kernel/power/snapshot.c +++ b/kernel/power/snapshot.c @@ -1723,8 +1723,8 @@ static unsigned long minimum_image_size(unsigned long saveable) * /sys/power/reserved_size, respectively). To make this happen, we compute the * total number of available page frames and allocate at least * - * ([page frames total] + PAGES_FOR_IO + [metadata pages]) / 2 - * + 2 * DIV_ROUND_UP(reserved_size, PAGE_SIZE) + * ([page frames total] - PAGES_FOR_IO - [metadata pages]) / 2 + * - 2 * DIV_ROUND_UP(reserved_size, PAGE_SIZE) * * of them, which corresponds to the maximum size of a hibernation image. *