kernel/lib/raid6/mktables.c, branch linux-5.1.y

lib/raid6: Add log-of-2 table for RAID6 HW requiring disk position

2017-05-16T04:31:57Z

The raid6_gfexp table represents {2}^n values for 0 <= n < 256. The Linux async_tx framework pass values from raid6_gfexp as coefficients for each source to prep_dma_pq() callback of DMA channel with PQ capability. This creates problem for RAID6 offload engines (such as Broadcom SBA) which take disk position (i.e. log of {2}) instead of multiplicative cofficients from raid6_gfexp table. This patch adds raid6_gflog table having log-of-2 value for any given x such that 0 <= x < 256. For any given disk coefficient x, the corresponding disk position is given by raid6_gflog[x]. The RAID6 offload engine driver can use this newly added raid6_gflog table to get disk position from multiplicative coefficient. Signed-off-by: Anup Patel Reviewed-by: Scott Branden Reviewed-by: Ray Jui Acked-by: Shaohua Li Signed-off-by: Vinod Koul

lib/raid6: Add SSSE3 optimized recovery functions

2012-05-22T03:54:18Z

Add SSSE3 optimized recovery functions, as well as a system for selecting the most appropriate recovery functions to use. Originally-by: H. Peter Anvin Signed-off-by: Jim Kukunas Signed-off-by: NeilBrown

md: Add in export.h for files using EXPORT_SYMBOL

2011-10-31T23:31:19Z

These files were getting the defines for EXPORT_SYMBOL because device.h was including module.h. But we are going to put an end to that. So add the proper export.h include now. Signed-off-by: Paul Gortmaker

md: Factor out RAID6 algorithms into lib/

2009-10-29T14:38:47Z

We'll want to use these in btrfs too. Signed-off-by: David Woodhouse