Re: [PATCH] crypto: allow to assign gfp_t for __crypto_alloc_tfm
From: Herbert Xu <herbert@gondor.apana.org.au>
Date: 2015-05-19 05:50:05
Also in:
linux-arm-kernel, linux-ext4, linux-f2fs-devel, lkml
On Mon, May 18, 2015 at 10:46:56PM -0700, Jaegeuk Kim wrote:
This patch adds a parameter, gfp_t, for __crypto_alloc_tfm. Now EXT4 and F2FS use the crypto engine to encrypt a page when writing it to the disk. That happens during ->writepage and it needs to allocate memory with GFP_NOFS. Otherwise, in the f2fs case, kernel reports such the following warning.
Normally crypto structures should only be allocated on control paths where sleeping or swapping is not an issue. Why is ext4 doing crypto allocations on the data path? Cheers, -- Email: Herbert Xu [off-list ref] Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt