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page-pipe: fix limiting a pipe size

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But actually, 5a92f100b8 probably has to be reverted as a whole.
PIPE_MAX_SIZE is the hard limit to avoid PAGE_ALLOC_COSTLY_ORDER
allocations in the kernel. But F_SETPIPE_SZ rounds up a requested pipe
size to a power-of-2 pages. It means that when we request PIPE_MAX_SIZE
that isn't a power-of-2 number, we actually request a pipe size greater
than PIPE_MAX_SIZE.

Fixes: 5a92f100b8 ("page-pipe: Resize up to PIPE_MAX_SIZE")

Signed-off-by: Andrei Vagin <avagin@gmail.com>
This commit is contained in:
Andrei Vagin 2022-04-27 06:51:47 +03:00
parent ff92731690
commit 51533d98ac
1 changed files with 1 additions and 1 deletions
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criu/page-pipe.c
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@ -56,7 +56,7 @@ static inline int ppb_resize_pipe(struct page_pipe_buf *ppb)
if (new_size > PIPE_MAX_SIZE) {
if (ppb->pipe_size < PIPE_MAX_SIZE)
ppb->pipe_size = PIPE_MAX_SIZE;
new_size = PIPE_MAX_SIZE;
else
return 1;
}