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Commite2782f560c("Revert "dm raid: remove unnecessary discard limits for raid10"") exposed compiler warnings introduced by commite0910c8e4f("dm raid: fix discard limits for raid1 and raid10"): In file included from ./include/linux/kernel.h:14, from ./include/asm-generic/bug.h:20, from ./arch/x86/include/asm/bug.h:93, from ./include/linux/bug.h:5, from ./include/linux/mmdebug.h:5, from ./include/linux/gfp.h:5, from ./include/linux/slab.h:15, from drivers/md/dm-raid.c:8: drivers/md/dm-raid.c: In function ‘raid_io_hints’: ./include/linux/minmax.h:18:28: warning: comparison of distinct pointer types lacks a cast (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1))) ^~ ./include/linux/minmax.h:32:4: note: in expansion of macro ‘__typecheck’ (__typecheck(x, y) && __no_side_effects(x, y)) ^~~~~~~~~~~ ./include/linux/minmax.h:42:24: note: in expansion of macro ‘__safe_cmp’ __builtin_choose_expr(__safe_cmp(x, y), \ ^~~~~~~~~~ ./include/linux/minmax.h:51:19: note: in expansion of macro ‘__careful_cmp’ #define min(x, y) __careful_cmp(x, y, <) ^~~~~~~~~~~~~ ./include/linux/minmax.h:84:39: note: in expansion of macro ‘min’ __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); }) ^~~ drivers/md/dm-raid.c:3739:33: note: in expansion of macro ‘min_not_zero’ limits->max_discard_sectors = min_not_zero(rs->md.chunk_sectors, ^~~~~~~~~~~~ Fix this by changing the chunk_sectors member of 'struct mddev' from int to 'unsigned int' to match the type used for the 'chunk_sectors' member of 'struct queue_limits'. Various MD code still uses 'int' but none of it appears to ever make use of signed int; and storing positive signed int in unsigned is perfectly safe. Reported-by: Song Liu <songliubraving@fb.com> Fixes:e2782f560c("Revert "dm raid: remove unnecessary discard limits for raid10"") Fixes:e0910c8e4f("dm raid: fix discard limits for raid1 and raid10") Cc: stable@vger,kernel.org #e0910c8e4fwas marked for stable@ Signed-off-by: Mike Snitzer <snitzer@redhat.com> Reviewed-by: Song Liu <song@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.