litmus-rt.git - The LITMUS^RT kernel.

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author	Stephen Boyd <sboyd@codeaurora.org>	2012-05-24 03:45:21 -0400
committer	Ingo Molnar <mingo@kernel.org>	2012-06-08 05:59:46 -0400
commit	eab309494ae2b9e15f85520f00de3893162c2e43 (patch)
tree	dd0b7ae9b455e9b999665dc8dbcd51679fdade70 /lib/mpi/mpi-scan.c
parent	8a173b1476d126674104c7c5c6cef0bcd824b001 (diff)

memblock: Document memblock_is_region_{memory,reserved}()

At first glance one would think that memblock_is_region_memory() and memblock_is_region_reserved() would be implemented in the same way. Unfortunately they aren't and the former returns whether the region specified is a subset of a memory bank while the latter returns whether the region specified intersects with reserved memory. Document the two functions so that users aren't tempted to make the implementation the same between them and to clarify the purpose of the functions. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Cc: Tejun Heo <tj@kernel.org> Link: http://lkml.kernel.org/r/1337845521-32755-1-git-send-email-sboyd@codeaurora.org Signed-off-by: Ingo Molnar <mingo@kernel.org>

Diffstat (limited to 'lib/mpi/mpi-scan.c')

0 files changed, 0 insertions, 0 deletions

/* * Copyright (c) 2009 Atheros Communications Inc. * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include <linux/kernel.h> #include <linux/module.h> #include "ath.h" MODULE_AUTHOR("Atheros Communications"); MODULE_DESCRIPTION("Shared library for Atheros wireless LAN cards."); MODULE_LICENSE("Dual BSD/GPL"); struct sk_buff *ath_rxbuf_alloc(struct ath_common *common, u32 len, gfp_t gfp_mask) { struct sk_buff *skb; u32 off; /* * Cache-line-align. This is important (for the * 5210 at least) as not doing so causes bogus data * in rx'd frames. */ /* Note: the kernel can allocate a value greater than * what we ask it to give us. We really only need 4 KB as that * is this hardware supports and in fact we need at least 3849 * as that is the MAX AMSDU size this hardware supports. * Unfortunately this means we may get 8 KB here from the * kernel... and that is actually what is observed on some * systems :( */ skb = __dev_alloc_skb(len + common->cachelsz - 1, gfp_mask); if (skb != NULL) { off = ((unsigned long) skb->data) % common->cachelsz; if (off != 0) skb_reserve(skb, common->cachelsz - off); } else { printk(KERN_ERR "skbuff alloc of size %u failed\n", len); return NULL; } return skb; } EXPORT_SYMBOL(ath_rxbuf_alloc);


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