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configure framework: detect make_req_fn type

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Signed-off-by: Michal Mielewczyk <michal.mielewczyk@huawei.com>
This commit is contained in:
Michal Mielewczyk
2024-09-25 08:14:15 +02:00
parent f44b3d8867
commit 8fbbf31734
2 changed files with 91 additions and 25 deletions
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87
configure.d/1_make_req_type.conf Normal file
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@@ -0,0 +1,87 @@
#!/bin/bash
#
# Copyright(c) 2024 Huawei Technologies
# SPDX-License-Identifier: BSD-3-Clause
#
. $(dirname $3)/conf_framework.sh
check() {
cur_name=$(basename $2)
config_file_path=$1
# The commit c62b37d96b6eb3ec5 in the kernel repo introduces `submit_bio`
# and removes make_request_fn
if compile_module $cur_name "struct block_device_operations x; x.submit_bio;" "linux/blkdev.h";
then
# If it's impossible to cast the return value of submit_bio()
# to an int we're assuming the function is of type void.
# It's not a generic solution because the check would pass if
# the return type would be a struct, but it can't happend in this
# specific scenario
# Mind the negation in the condition
if ! compile_module $cur_name \
"struct block_device_operations x; int y = (int)x.submit_bio(NULL);" "linux/blkdev.h";
then
# submit_bio is of type void
echo $cur_name "1" >> $config_file_path
elif compile_module $cur_name \
"struct block_device_operations x; blk_qc_t y = x.submit_bio(NULL);" "linux/blkdev.h" ;
then
# submit_bio is of type blk_qc_t
echo $cur_name "2" >> $config_file_path
else
echo $cur_name "X" >> $config_file_path
fi
else
# If it's impossible to cast the return value of make_request_fn()
# to an int we're assuming the function is of type void.
# It's not a generic solution because the check would pass if
# the return type would be a struct, but it can't happend in this
# specific scenario
# Mind the negation in the condition
if ! compile_module $cur_name \
"struct request_queue *q; int y = (int)q->make_request_fn(NULL);" "linux/blkdev.h";
then
# make_request_fn is of type void
echo $cur_name "3" >> $config_file_path
elif ! compile_module $cur_name \
"struct request_queue *q; blk_qc_t y = q->make_request_fn(NULL);" "linux/blkdev.h";
then
# make_request_fn is of type blk_qc_t
echo $cur_name "4" >> $config_file_path
elif ! compile_module $cur_name \
"struct request_queue *q; int y = q->make_request_fn(NULL);" "linux/blkdev.h";
then
# make_request_fn is of type int
echo $cur_name "5" >> $config_file_path
else
echo $cur_name "X" >> $config_file_path
fi
fi
}
apply() {
case "$1" in
"1")
add_define "CAS_KRETURN(_x) return "
add_define "CAS_MAKE_REQ_RET_TYPE void " ;;
"2")
add_define "CAS_KRETURN(_x) ({ return (_x); }) "
add_define "CAS_MAKE_REQ_RET_TYPE blk_qc_t " ;;
"3")
add_define "CAS_KRETURN(_x) return "
add_define "CAS_MAKE_REQ_RET_TYPE void " ;;
"4")
add_define "CAS_KRETURN(_x) ({ return (_x); }) "
add_define "CAS_MAKE_REQ_RET_TYPE blk_qc_t " ;;
"5")
add_define "CAS_KRETURN(_x) ({ return (_x); }) "
add_define "CAS_MAKE_REQ_RET_TYPE int " ;;
*)
exit 1
esac
}
conf_run $@