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io_uring/kbuf: get rid of bl->is_ready

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commit 3b80cff5a4d117c53d38ce805823084eaeffbde6 upstream.

Now that xarray is being exclusively used for the buffer_list lookup,
this check is no longer needed. Get rid of it and the is_ready member.

Cc: stable@vger.kernel.org # v6.4+
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jens Axboe 2024-03-14 10:46:40 -06:00 committed by Greg Kroah-Hartman
parent d6e03f6d8b
commit 4c0a5da0e7
2 changed files with 0 additions and 10 deletions
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8
io_uring/kbuf.c
View File

@ -59,7 +59,6 @@ static int io_buffer_add_list(struct io_ring_ctx *ctx,
* always under the ->uring_lock, but the RCU lookup from mmap does.
*/
bl->bgid = bgid;
smp_store_release(&bl->is_ready, 1);
return xa_err(xa_store(&ctx->io_bl_xa, bgid, bl, GFP_KERNEL));
}
@ -691,13 +690,6 @@ void *io_pbuf_get_address(struct io_ring_ctx *ctx, unsigned long bgid)
if (!bl || !bl->is_mmap)
return NULL;
/*
* Ensure the list is fully setup. Only strictly needed for RCU lookup
* via mmap, and in that case only for the array indexed groups. For
* the xarray lookups, it's either visible and ready, or not at all.
*/
if (!smp_load_acquire(&bl->is_ready))
return NULL;
return bl->buf_ring;
}

2
io_uring/kbuf.h
View File

@ -29,8 +29,6 @@ struct io_buffer_list {
__u8 is_mapped;
/* ring mapped provided buffers, but mmap'ed by application */
__u8 is_mmap;
/* bl is visible from an RCU point of view for lookup */
__u8 is_ready;
};
struct io_buffer {