License cleanup: add SPDX GPL-2.0 license identifier to files with no license
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.
By default all files without license information are under the default
license of the kernel, which is GPL version 2.
Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.
How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,
Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.
The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.
The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.
Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if <5
lines).
All documentation files were explicitly excluded.
The following heuristics were used to determine which SPDX license
identifiers to apply.
- when both scanners couldn't find any license traces, file was
considered to have no license information in it, and the top level
COPYING file license applied.
For non */uapi/* files that summary was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 11139
and resulted in the first patch in this series.
If that file was a */uapi/* path one, it was "GPL-2.0 WITH
Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 WITH Linux-syscall-note 930
and resulted in the second patch in this series.
- if a file had some form of licensing information in it, and was one
of the */uapi/* ones, it was denoted with the Linux-syscall-note if
any GPL family license was found in the file or had no licensing in
it (per prior point). Results summary:
SPDX license identifier # files
---------------------------------------------------|------
GPL-2.0 WITH Linux-syscall-note 270
GPL-2.0+ WITH Linux-syscall-note 169
((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21
((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17
LGPL-2.1+ WITH Linux-syscall-note 15
GPL-1.0+ WITH Linux-syscall-note 14
((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5
LGPL-2.0+ WITH Linux-syscall-note 4
LGPL-2.1 WITH Linux-syscall-note 3
((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3
((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1
and that resulted in the third patch in this series.
- when the two scanners agreed on the detected license(s), that became
the concluded license(s).
- when there was disagreement between the two scanners (one detected a
license but the other didn't, or they both detected different
licenses) a manual inspection of the file occurred.
- In most cases a manual inspection of the information in the file
resulted in a clear resolution of the license that should apply (and
which scanner probably needed to revisit its heuristics).
- When it was not immediately clear, the license identifier was
confirmed with lawyers working with the Linux Foundation.
- If there was any question as to the appropriate license identifier,
the file was flagged for further research and to be revisited later
in time.
In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.
Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights. The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.
Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.
In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.
Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
- a full scancode scan run, collecting the matched texts, detected
license ids and scores
- reviewing anything where there was a license detected (about 500+
files) to ensure that the applied SPDX license was correct
- reviewing anything where there was no detection but the patch license
was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
SPDX license was correct
This produced a worksheet with 20 files needing minor correction. This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.
These .csv files were then reviewed by Greg. Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected. This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.) Finally Greg ran the script using the .csv files to
generate the patches.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-01 22:07:57 +08:00
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/* SPDX-License-Identifier: GPL-2.0 */
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2017-01-09 23:55:19 +08:00
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/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* Work Requests exploiting Infiniband API
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*
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* Copyright IBM Corp. 2016
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*
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* Author(s): Steffen Maier <maier@linux.vnet.ibm.com>
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*/
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#ifndef SMC_WR_H
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#define SMC_WR_H
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#include <linux/atomic.h>
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#include <rdma/ib_verbs.h>
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#include <asm/div64.h>
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#include "smc.h"
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#include "smc_core.h"
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#define SMC_WR_BUF_CNT 16 /* # of ctrl buffers per link */
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#define SMC_WR_TX_WAIT_FREE_SLOT_TIME (10 * HZ)
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#define SMC_WR_TX_SIZE 44 /* actual size of wr_send data (<=SMC_WR_BUF_SIZE) */
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#define SMC_WR_TX_PEND_PRIV_SIZE 32
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struct smc_wr_tx_pend_priv {
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u8 priv[SMC_WR_TX_PEND_PRIV_SIZE];
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};
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typedef void (*smc_wr_tx_handler)(struct smc_wr_tx_pend_priv *,
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struct smc_link *,
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enum ib_wc_status);
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2017-01-09 23:55:22 +08:00
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typedef bool (*smc_wr_tx_filter)(struct smc_wr_tx_pend_priv *,
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unsigned long);
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typedef void (*smc_wr_tx_dismisser)(struct smc_wr_tx_pend_priv *);
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2017-01-09 23:55:19 +08:00
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struct smc_wr_rx_handler {
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struct hlist_node list; /* hash table collision resolution */
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void (*handler)(struct ib_wc *, void *);
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u8 type;
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};
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/* Only used by RDMA write WRs.
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* All other WRs (CDC/LLC) use smc_wr_tx_send handling WR_ID implicitly
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*/
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static inline long smc_wr_tx_get_next_wr_id(struct smc_link *link)
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{
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return atomic_long_inc_return(&link->wr_tx_id);
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}
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static inline void smc_wr_tx_set_wr_id(atomic_long_t *wr_tx_id, long val)
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{
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atomic_long_set(wr_tx_id, val);
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2021-10-07 22:14:40 +08:00
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}
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static inline bool smc_wr_tx_link_hold(struct smc_link *link)
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{
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2021-12-28 17:03:24 +08:00
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if (!smc_link_sendable(link))
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2021-10-07 22:14:40 +08:00
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return false;
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atomic_inc(&link->wr_tx_refcnt);
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return true;
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}
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static inline void smc_wr_tx_link_put(struct smc_link *link)
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{
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if (atomic_dec_and_test(&link->wr_tx_refcnt))
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wake_up_all(&link->wr_tx_wait);
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2017-01-09 23:55:19 +08:00
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}
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2022-09-06 21:01:39 +08:00
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static inline void smc_wr_drain_cq(struct smc_link *lnk)
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{
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wait_event(lnk->wr_rx_empty_wait, lnk->wr_rx_id_compl == lnk->wr_rx_id);
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}
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2019-11-14 20:02:44 +08:00
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static inline void smc_wr_wakeup_tx_wait(struct smc_link *lnk)
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{
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wake_up_all(&lnk->wr_tx_wait);
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}
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static inline void smc_wr_wakeup_reg_wait(struct smc_link *lnk)
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{
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wake_up(&lnk->wr_reg_wait);
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}
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2017-01-09 23:55:19 +08:00
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/* post a new receive work request to fill a completed old work request entry */
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static inline int smc_wr_rx_post(struct smc_link *link)
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{
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int rc;
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u64 wr_id, temp_wr_id;
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u32 index;
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wr_id = ++link->wr_rx_id; /* tasklet context, thus not atomic */
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temp_wr_id = wr_id;
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index = do_div(temp_wr_id, link->wr_rx_cnt);
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link->wr_rx_ibs[index].wr_id = wr_id;
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2018-07-19 00:25:30 +08:00
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rc = ib_post_recv(link->roce_qp, &link->wr_rx_ibs[index], NULL);
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2017-01-09 23:55:19 +08:00
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return rc;
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}
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int smc_wr_create_link(struct smc_link *lnk);
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int smc_wr_alloc_link_mem(struct smc_link *lnk);
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2021-10-16 17:37:49 +08:00
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int smc_wr_alloc_lgr_mem(struct smc_link_group *lgr);
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2017-01-09 23:55:19 +08:00
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void smc_wr_free_link(struct smc_link *lnk);
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void smc_wr_free_link_mem(struct smc_link *lnk);
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2021-10-16 17:37:49 +08:00
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void smc_wr_free_lgr_mem(struct smc_link_group *lgr);
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2017-01-09 23:55:19 +08:00
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void smc_wr_remember_qp_attr(struct smc_link *lnk);
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void smc_wr_remove_dev(struct smc_ib_device *smcibdev);
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void smc_wr_add_dev(struct smc_ib_device *smcibdev);
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int smc_wr_tx_get_free_slot(struct smc_link *link, smc_wr_tx_handler handler,
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struct smc_wr_buf **wr_buf,
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2019-02-04 20:44:44 +08:00
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struct smc_rdma_wr **wrs,
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2017-01-09 23:55:19 +08:00
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struct smc_wr_tx_pend_priv **wr_pend_priv);
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2021-10-16 17:37:50 +08:00
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int smc_wr_tx_get_v2_slot(struct smc_link *link,
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smc_wr_tx_handler handler,
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struct smc_wr_v2_buf **wr_buf,
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struct smc_wr_tx_pend_priv **wr_pend_priv);
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2017-01-09 23:55:19 +08:00
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int smc_wr_tx_put_slot(struct smc_link *link,
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struct smc_wr_tx_pend_priv *wr_pend_priv);
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int smc_wr_tx_send(struct smc_link *link,
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struct smc_wr_tx_pend_priv *wr_pend_priv);
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2021-10-16 17:37:50 +08:00
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int smc_wr_tx_v2_send(struct smc_link *link,
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struct smc_wr_tx_pend_priv *priv, int len);
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2020-05-04 20:18:41 +08:00
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int smc_wr_tx_send_wait(struct smc_link *link, struct smc_wr_tx_pend_priv *priv,
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unsigned long timeout);
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2017-01-09 23:55:19 +08:00
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void smc_wr_tx_cq_handler(struct ib_cq *ib_cq, void *cq_context);
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net/smc: fix kernel panic caused by race of smc_sock
A crash occurs when smc_cdc_tx_handler() tries to access smc_sock
but smc_release() has already freed it.
[ 4570.695099] BUG: unable to handle page fault for address: 000000002eae9e88
[ 4570.696048] #PF: supervisor write access in kernel mode
[ 4570.696728] #PF: error_code(0x0002) - not-present page
[ 4570.697401] PGD 0 P4D 0
[ 4570.697716] Oops: 0002 [#1] PREEMPT SMP NOPTI
[ 4570.698228] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.16.0-rc4+ #111
[ 4570.699013] Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 8c24b4c 04/0
[ 4570.699933] RIP: 0010:_raw_spin_lock+0x1a/0x30
<...>
[ 4570.711446] Call Trace:
[ 4570.711746] <IRQ>
[ 4570.711992] smc_cdc_tx_handler+0x41/0xc0
[ 4570.712470] smc_wr_tx_tasklet_fn+0x213/0x560
[ 4570.712981] ? smc_cdc_tx_dismisser+0x10/0x10
[ 4570.713489] tasklet_action_common.isra.17+0x66/0x140
[ 4570.714083] __do_softirq+0x123/0x2f4
[ 4570.714521] irq_exit_rcu+0xc4/0xf0
[ 4570.714934] common_interrupt+0xba/0xe0
Though smc_cdc_tx_handler() checked the existence of smc connection,
smc_release() may have already dismissed and released the smc socket
before smc_cdc_tx_handler() further visits it.
smc_cdc_tx_handler() |smc_release()
if (!conn) |
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|smc_cdc_tx_dismiss_slots()
| smc_cdc_tx_dismisser()
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|sock_put(&smc->sk) <- last sock_put,
| smc_sock freed
bh_lock_sock(&smc->sk) (panic) |
To make sure we won't receive any CDC messages after we free the
smc_sock, add a refcount on the smc_connection for inflight CDC
message(posted to the QP but haven't received related CQE), and
don't release the smc_connection until all the inflight CDC messages
haven been done, for both success or failed ones.
Using refcount on CDC messages brings another problem: when the link
is going to be destroyed, smcr_link_clear() will reset the QP, which
then remove all the pending CQEs related to the QP in the CQ. To make
sure all the CQEs will always come back so the refcount on the
smc_connection can always reach 0, smc_ib_modify_qp_reset() was replaced
by smc_ib_modify_qp_error().
And remove the timeout in smc_wr_tx_wait_no_pending_sends() since we
need to wait for all pending WQEs done, or we may encounter use-after-
free when handling CQEs.
For IB device removal routine, we need to wait for all the QPs on that
device been destroyed before we can destroy CQs on the device, or
the refcount on smc_connection won't reach 0 and smc_sock cannot be
released.
Fixes: 5f08318f617b ("smc: connection data control (CDC)")
Reported-by: Wen Gu <guwen@linux.alibaba.com>
Signed-off-by: Dust Li <dust.li@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2021-12-28 17:03:25 +08:00
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void smc_wr_tx_wait_no_pending_sends(struct smc_link *link);
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2017-01-09 23:55:19 +08:00
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int smc_wr_rx_register_handler(struct smc_wr_rx_handler *handler);
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int smc_wr_rx_post_init(struct smc_link *link);
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void smc_wr_rx_cq_handler(struct ib_cq *ib_cq, void *cq_context);
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2017-07-28 19:56:17 +08:00
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int smc_wr_reg_send(struct smc_link *link, struct ib_mr *mr);
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2017-01-09 23:55:19 +08:00
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#endif /* SMC_WR_H */
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