Thank you Herbert for your reply. Will look around this. > -----Original Message----- > From: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> > Sent: 18 February 2025 14:07 > To: Meenakshi Aggarwal <meenakshi.aggarwal@xxxxxxx> > Cc: Giovanni Cabiddu <giovanni.cabiddu@xxxxxxxxx>; Eric Biggers > <ebiggers@xxxxxxxxxx>; agk@xxxxxxxxxx; snitzer@xxxxxxxxxx; linux- > crypto@xxxxxxxxxxxxxxx; dm-devel@xxxxxxxxxx; linux- > kernel@xxxxxxxxxxxxxxx; qat-linux@xxxxxxxxx; heinzm@xxxxxxxxxx; Horia > Geanta <horia.geanta@xxxxxxx>; Varun Sethi <V.Sethi@xxxxxxx>; Pankaj > Gupta <pankaj.gupta@xxxxxxx>; Gaurav Jain <gaurav.jain@xxxxxxx>; > davem@xxxxxxxxxxxxx; Iuliana Prodan <iuliana.prodan@xxxxxxx>; Fiona > Trahe <fiona.trahe@xxxxxxxxx> > Subject: Re: [PATCH 1/3] dm integrity: do not filter algos with > CRYPTO_ALG_ALLOCATES_MEMORY > > On Wed, Feb 07, 2024 at 06:22:06AM +0000, Meenakshi Aggarwal wrote: > > > > What are your plans for this change? > > I finally have a solution for you. > > The answer is to use a software fallback. As software fallbacks do not need to > allocate memory, they can be used in an OOM situation and you fail to > allocate memory in the driver with GFP_ATOMIC. > > This can either be done using the existing shash interface through > SHASH_DESC_ON_STACK, or with my new hash interface where you can use > HASH_REQUEST_ON_STACK. > > Once you have implemented this fallback strategy you may remove the > CRYPTO_ALG_ALLOCATES_MEMORY flag from your driver. > > Cheers, > -- > Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: > https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fgondor. > apana.org.au%2F~herbert%2F&data=05%7C02%7Cmeenakshi.aggarwal%40n > xp.com%7Cf6d4a8e6289b4a9dc1af08dd4ff783d3%7C686ea1d3bc2b4c6fa92c > d99c5c301635%7C0%7C0%7C638754646705133902%7CUnknown%7CTWFpb > GZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zM > iIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=%2BfhgGBR > wm7gYcwhIu5%2FIqM9H%2BypKSqy4zOG0wOwNiOw%3D&reserved=0 > PGP Key: > https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fgondor. > apana.org.au%2F~herbert%2Fpubkey.txt&data=05%7C02%7Cmeenakshi.agga > rwal%40nxp.com%7Cf6d4a8e6289b4a9dc1af08dd4ff783d3%7C686ea1d3bc2b > 4c6fa92cd99c5c301635%7C0%7C0%7C638754646705157205%7CUnknown%7 > CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJ > XaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=%2 > BRonzL%2F8MSMEfp2DotM%2FkRx1bIWDStLckhzmH8nVcjc%3D&reserved=0
