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scst/scripts/kernel/specialize-patch
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Gleb Chesnokov a7f1f95a70 scripts: Preserve kernel patch conditions across whitespace changes 
In-tree CI builds report compatibility errors after whitespace cleanup:

  Linux 7.3:
    conflicting types for 'wr'; have 'struct ib_rdma_wr'
    'sgv_shrinker' is a pointer; did you mean to use '->'?

  Linux 6.18.57, dev_handlers/scst_vdisk_main.c:330:
    too many arguments to function 'blkdev_issue_flush'

Two assumptions in specialize-patch change branch selection when only
whitespace changes in otherwise equivalent preprocessor expressions.

The dispatch expression accepts only spaces before '#'. A tab-indented
opening directive is copied as ordinary text, while its closing directive
still changes the conditional nesting state. Accept all horizontal
whitespace as the expression evaluator already does, including when an
indented #elif becomes #if after discarding its original opening branch.

The evaluator also substitutes an empty string for absent RHEL_MAJOR,
RHEL_RELEASE_CODE and MOFED version macros. Thus 'RHEL_MAJOR - 0' becomes
'- 0', which its signed-number patterns cannot reduce correctly. This
leaves the two-argument blkdev_issue_flush() call in a modern upstream
patch. Substitute zero for these absent numeric macros, matching C
preprocessor semantics and the existing RHEL_MINOR handling. Keep their
defined() results false and preserve supplied vendor version values.

Add isolated regressions for spaces and tabs around '#', nested unknown
guards, promoted #elif branches and absent vendor versions. Cover all
three flush signatures at the upstream 5.8/5.12 and RHEL 8.4/8.6 boundaries,
plus EL7, RHEL 9, upstream 6.18.57 and 7.3, with both '-0' and '- 0'. Apply
each resulting patch in a temporary directory in removal and blank-
preserving modes, checking selected branches, surviving guards and hunk
lengths without compiling or loading SCST.

Install patch in the CI build stage used by these generator tests. Without
this dependency, all 98 specialization subcases abort before applying the
patches, with the following error in the minimal Fedora build image:

  FileNotFoundError: [Errno 2] No such file or directory: 'patch'
2026-10-22 14:30:26 +03:00

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#!/usr/bin/gawk -f
############################################################################
#
# Script that removes preprocessor checks on the kernel version. Somewhat
# related to the v4l-scripts-gentree.pl script.
#
# Copyright (C) 2008-2009 Bart Van Assche <bvanassche@acm.org>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation, version 2
# of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
############################################################################
# Usage:
# * Specify the kernel version code and optionally the RHEL version as follows:
# -v kernel_version=... -vRHEL_MAJOR=... -vRHEL_MINOR=...
# * Provide the patch to be processed to stdin.
#
# The output of this script will be a patch that is specialized for the
# specified kernel version.
# Convert a kernel version in the x.y.z format into numeric form, just like
# the KERNEL_VERSION() macro.
function version_number(a, b, c) {
return a * 65536 + b * 256 + (c > 255 ? 255 : c);
}
function version_code(kver, array) {
if (!match(kver, "^([0-9]+)\\.([0-9]+)\\.([0-9]+)$", array))
match(kver, "^([0-9]+)\\.([0-9]+)$", array)
return version_number(array[1], array[2], array[3]);
}
# Evaluate a preprocessor statement via repeated substitutions.
# Mathematicians call this algorithm 'term rewriting'.
# Note: the order in which the substitutions appear below is important --
# it is the same order as the order of operators in C.
function evaluate(stmnt, pattern, arg, op, result) {
if (debug)
printf "/* debug specialize-patch: (a) %s */\n", stmnt
# Remove C-style comments.
gsub("[[:blank:]]*\\/\\*[^*]*\\*\\/[[:blank:]]*", "", stmnt)
# Remove the spaces before the #-sign.
gsub("^\\+[[:blank:]]*#[[:blank:]]*", "+#", stmnt)
if (match(stmnt, "^\\+#ifdef (.*)$", arg))
{
stmnt = "+#if defined(" arg[1] ")"
}
if (match(stmnt, "^\\+#ifndef (.*)$", arg))
{
stmnt = "+#if !defined(" arg[1] ")"
}
# See also commit c9c9762d4d44 ("block: return the correct bvec when checking
# for gaps"; v5.14-rc1).
gsub("defined\\(bio_multiple_segments\\)",
"(LINUX_VERSION_CODE >= KERNEL_VERSION(5, 13, 0))", stmnt)
gsub("defined\\(REGISTER_MAD_AGENT_HAS_FLAGS_ARG\\)",
"(LINUX_VERSION_CODE >= KERNEL_VERSION(3, 17, 0) || " \
"RHEL_RELEASE_CODE -0 >= 7 * 256)", stmnt)
gsub("SOCK_RECVMSG_HAS_FOUR_ARGS",
"(LINUX_VERSION_CODE < KERNEL_VERSION(4, 7, 0) \\&\\& " \
"!defined(UEK_KABI_RENAME))", stmnt)
gsub("defined\\(USE_PRE_440_WR_STRUCTURE\\)",
"(LINUX_VERSION_CODE < KERNEL_VERSION(4, 4, 0) \\&\\& " \
"RHEL_RELEASE_CODE -0 < 7 * 256 + 5)", stmnt)
gsub("defined\\(IB_CREATE_CQ_HAS_INIT_ATTR\\)",
"(LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0) || " \
"RHEL_RELEASE_CODE -0 >= 7 * 256 + 5)", stmnt)
gsub("defined\\(CREATE_SEND_MAD_HAS_AH_ARG\\)", "0", stmnt)
gsub("defined\\(CREATE_SEND_MAD_HAS_BASE_ARG\\)",
"(LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0) || " \
"RHEL_RELEASE_CODE -0 >= 7 * 256 + 5)", stmnt)
gsub("defined\\(IB_CM_LISTEN_TAKES_FOURTH_ARG\\)",
"(LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0) \\&\\& " \
"RHEL_RELEASE_CODE -0 < 7 * 256 + 5)", stmnt)
gsub("defined\\(IB_CM_LISTEN_TAKES_THIRD_ARG\\)",
"(LINUX_VERSION_CODE < KERNEL_VERSION(6, 1, 0) \\&\\& " \
"!(RHEL_MAJOR -0 == 8 \\&\\& RHEL_MINOR -0 >= 9 || " \
"RHEL_MAJOR -0 == 9 \\&\\& RHEL_MINOR -0 >= 3))", stmnt)
gsub("IB_CLIENT_ADD_ONE_RETURNS_INT",
"(LINUX_VERSION_CODE >= KERNEL_VERSION(5, 8, 0) || " \
"RHEL_RELEASE_CODE -0 >= 8 * 256 + 4)", stmnt)
gsub("defined\\(IB_CLIENT_REMOVE_TAKES_TWO_ARGS\\)",
"(LINUX_VERSION_CODE >= KERNEL_VERSION(4, 3, 0) || " \
"RHEL_RELEASE_CODE -0 >= 7 * 256 + 5)", stmnt)
gsub("defined\\(IB_QUERY_GID_HAS_ATTR_ARG\\)",
"(LINUX_VERSION_CODE >= KERNEL_VERSION(4, 4, 0) || " \
"RHEL_RELEASE_CODE -0 >= 7 * 256 + 5)", stmnt)
gsub("RDMA_CREATE_ID_TAKES_NET_ARG",
"(LINUX_VERSION_CODE >= KERNEL_VERSION(4, 4, 0) || " \
"RHEL_RELEASE_CODE -0 >= 7 * 256 + 5)", stmnt)
gsub("defined\\(HAVE_DEV_ATTR_MAX_RECV_SGE\\)",
"(LINUX_VERSION_CODE >= KERNEL_VERSION(4, 19, 0) || " \
"RHEL_RELEASE_CODE -0 >= 7 * 256 + 7)", stmnt)
gsub("HAVE_DEV_ATTR_MAX_SEND_SGE",
"(LINUX_VERSION_CODE >= KERNEL_VERSION(4, 19, 0) || " \
"RHEL_RELEASE_CODE -0 >= 7 * 256 + 7)", stmnt)
gsub("HAVE_RDMA_DESTROY_AH_WITH_FLAGS",
"(LINUX_VERSION_CODE >= KERNEL_VERSION(4, 21, 0) || " \
"RHEL_RELEASE_CODE -0 >= 8 * 256 + 1)", stmnt)
gsub("HAVE_RDMA_DESTROY_AH",
"(LINUX_VERSION_CODE >= KERNEL_VERSION(4, 12, 0) || " \
"RHEL_RELEASE_CODE -0 >= 7 * 256 + 5)", stmnt)
gsub("HAVE_RDMA_QUERY_GID",
"(LINUX_VERSION_CODE >= KERNEL_VERSION(4, 19, 0) || " \
"RHEL_RELEASE_CODE -0 >= 8 * 256 + 1)", stmnt)
gsub("HAVE_SRP_DATA_DESC_IMM",
"(LINUX_VERSION_CODE >= KERNEL_VERSION(4, 21, 0) || " \
"RHEL_RELEASE_CODE -0 >= 8 * 256 + 1)", stmnt)
gsub("HAVE_STRUCT_SRP_LOGIN_REQ_RDMA",
"(LINUX_VERSION_CODE >= KERNEL_VERSION(4, 16, 0))", stmnt)
gsub("defined\\(HAVE_IB_QUERY_DEVICE\\)",
"(LINUX_VERSION_CODE < KERNEL_VERSION(4, 5, 0) \\&\\& " \
"RHEL_RELEASE_CODE -0 < 7 * 256 + 5)", stmnt)
gsub("defined\\(MAD_HANDLER_TAKES_SEND_BUF\\)",
"(LINUX_VERSION_CODE >= KERNEL_VERSION(4, 5, 0) || " \
"RHEL_RELEASE_CODE -0 >= 7 * 256 + 5)", stmnt)
gsub("defined\\(HAVE_IB_SET_CPI_RESP_TIME\\)",
"(LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0) || " \
"RHEL_RELEASE_CODE -0 >= 7 * 256 + 5)", stmnt)
gsub("defined\\(IB_PD_HAS_LOCAL_DMA_LKEY\\)",
"(LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0) || " \
"RHEL_RELEASE_CODE -0 >= 7 * 256 + 5)", stmnt)
gsub("defined\\(HAVE_IB_DMA_MAP_OPS\\)", "1", stmnt)
gsub("HAVE_IB_SG_DMA_LEN",
"(LINUX_VERSION_CODE < KERNEL_VERSION(5, 1, 0) \\&\\& " \
"RHEL_RELEASE_CODE -0 < 8 * 256 + 2)", stmnt)
gsub("RDMA_REJECT_HAS_FOUR_ARGS",
"(LINUX_VERSION_CODE >= KERNEL_VERSION(5, 8, 0) || " \
"RHEL_RELEASE_CODE -0 >= 8 * 256 + 4)", stmnt)
gsub("defined(ENABLE_NPIV)", 0, stmnt)
gsub("defined(FC_VPORT_CREATE_DEFINED)", 0, stmnt)
gsub("LINUX_VERSION_CODE", LINUX_VERSION_CODE, stmnt)
pattern="KERNEL_VERSION\\([[:blank:]]*([0-9]+)[[:blank:]]*,[[:blank:]]*([0-9]+)[[:blank:]]*,[[:blank:]]*([0-9]+)[[:blank:]]*\\)"
while (match(stmnt, pattern, op) != 0)
{
sub(pattern, version_number(op[1], op[2], op[3]), stmnt)
}
gsub("defined\\(INSIDE_KERNEL_TREE\\)", "1", stmnt)
gsub("defined\\(CONFIG_SUSE_KERNEL\\)", "0", stmnt)
gsub("defined\\(CONFIG_SCST_STRICT_SERIALIZING\\)", "0", stmnt)
# Undefined vendor version macros evaluate to zero in #if expressions.
# Keep an operand so that subtraction works with both "-0" and "- 0".
if (RHEL_MAJOR == "")
{
gsub("defined\\(RHEL_MAJOR\\)", "0", stmnt)
gsub("RHEL_MAJOR", "0", stmnt)
}
else
{
gsub("defined\\(RHEL_MAJOR\\)", "1", stmnt)
gsub("RHEL_MAJOR", RHEL_MAJOR, stmnt)
}
if (RHEL_MINOR == "")
{
gsub("defined\\(RHEL_MINOR\\)", "0", stmnt)
gsub("RHEL_MINOR", "0", stmnt)
}
else
{
gsub("defined\\(RHEL_MINOR\\)", "1", stmnt)
gsub("RHEL_MINOR", RHEL_MINOR, stmnt)
}
gsub("defined\\(RHEL_RELEASE_VERSION\\)", "1", stmnt)
if (RHEL_MAJOR == "" || RHEL_MINOR == "")
{
gsub("defined\\(RHEL_RELEASE_CODE\\)", "0", stmnt)
gsub("RHEL_RELEASE_CODE", "0", stmnt)
gsub("RHEL_RELEASE_VERSION\\([^,)]*,[ ]*[^,)]*\\)", "0", stmnt)
}
else
{
gsub("defined\\(RHEL_RELEASE_CODE\\)", "1", stmnt)
gsub("RHEL_RELEASE_CODE", RHEL_MAJOR * 256 + RHEL_MINOR, stmnt)
stmnt = gensub("RHEL_RELEASE_VERSION\\(([^,)]*),[ ]*([^,)]*)\\)",
"(\\1) * 256 + (\\2)", "g", stmnt)
}
if (MOFED_MAJOR == "") {
gsub("defined\\(MOFED_MAJOR\\)", "0", stmnt)
gsub("MOFED_MAJOR", "0", stmnt)
} else {
gsub("defined\\(MOFED_MAJOR\\)", "1", stmnt)
gsub("MOFED_MAJOR", MOFED_MAJOR, stmnt)
}
if (MOFED_MINOR == "") {
gsub("defined\\(MOFED_MINOR\\)", "0", stmnt)
gsub("MOFED_MINOR", "0", stmnt)
} else {
gsub("defined\\(MOFED_MINOR\\)", "1", stmnt)
gsub("MOFED_MINOR", MOFED_MINOR, stmnt)
}
gsub("defined\\(_COMPAT_LINUX_MM_H\\)", "0", stmnt)
gsub("defined\\(UEK_KABI_RENAME\\)", UEK_KABI_RENAME ? "1" : "0", stmnt)
if (SCST_IO_CONTEXT != "")
{
gsub("defined[[:blank:]]+SCST_IO_CONTEXT", SCST_IO_CONTEXT, stmnt)
gsub("defined[[:blank:]]*\\([[:blank:]]*SCST_IO_CONTEXT[[:blank:]]*\\)", SCST_IO_CONTEXT, stmnt)
}
if (generating_upstream_patch_defined)
{
gsub("defined[[:blank:]]+GENERATING_UPSTREAM_PATCH", 1, stmnt)
gsub("defined[[:blank:]]*\\([[:blank:]]*GENERATING_UPSTREAM_PATCH[[:blank:]]*\\)", 1, stmnt)
}
if (config_tcp_zero_copy_transfer_completion_notification_undefined)
{
gsub("defined[[:blank:]]+CONFIG_TCP_ZERO_COPY_TRANSFER_COMPLETION_NOTIFICATION", 0, stmnt)
gsub("defined[[:blank:]]*\\([[:blank:]]*CONFIG_TCP_ZERO_COPY_TRANSFER_COMPLETION_NOTIFICATION[[:blank:]]*\\)", 0, stmnt)
}
if (debug)
printf "/* debug specialize-patch: (b) %s */\n", stmnt
do
{
last_stmnt = stmnt
pattern = "![[:blank:]]*(-*[0-9]+)"
while (match(stmnt, pattern, op) != 0)
{
sub(pattern, op[1] == 0, stmnt)
}
pattern = "![[:blank:]]*\\([[:blank:]]*(-*[0-9]+)[[:blank:]]*\\)"
while (match(stmnt, pattern, op) != 0)
{
sub(pattern, op[1] == 0, stmnt)
}
pattern = "\\([[:blank:]]*(-*[0-9]+)[[:blank:]]*\\)"
while (match(stmnt, pattern, op) != 0)
{
sub(pattern, op[1], stmnt)
}
pattern="(-*[0-9]+)[[:blank:]]*(\\*|/)[[:blank:]]*(-*[0-9]+)"
while (match(stmnt, pattern, op) != 0)
{
result="error"
if (op[2] == "*") result = op[1] * op[3]
else if (op[2] == "/" && op[3] != 0) result = op[1] / op[3]
sub(pattern, result, stmnt)
}
pattern="(-*[0-9]+)[[:blank:]]*(\\+|-)[[:blank:]]*(-*[0-9]+)"
while (match(stmnt, pattern, op) != 0)
{
result="error"
if (op[2] == "+") result = op[1] + op[3]
else if (op[2] == "-") result = op[1] - op[3]
sub(pattern, result, stmnt)
}
pattern="(-*[0-9]+)[[:blank:]]*(<<|>>)[[:blank:]]*(-*[0-9]+)"
while (match(stmnt, pattern, op) != 0)
{
result="error"
if (op[2] == "<<") result = int(op[1] * (2**op[3]))
else if (op[2] == ">>") result = int(op[1] / (2**op[3]))
sub(pattern, result, stmnt)
}
pattern="(-*[0-9]+)[[:blank:]]*(<|<=|>|>=|==|!=)[[:blank:]]*(-*[0-9]+)"
while (match(stmnt, pattern, op) != 0)
{
result="error"
if (op[2] == "<" ) result = op[1] < op[3]
else if (op[2] == "<=") result = op[1] <= op[3]
else if (op[2] == ">" ) result = op[1] > op[3]
else if (op[2] == ">=") result = op[1] >= op[3]
else if (op[2] == "==") result = op[1] == op[3]
else if (op[2] == "!=") result = op[1] != op[3]
sub(pattern, result, stmnt)
}
pattern="(-*[0-9]+)[[:blank:]]*&&[[:blank:]]*\\([[:blank:]]*(-*[0-9]+)[[:blank:]]*\\)"
while (match(stmnt, pattern, op) != 0)
{
sub(pattern, (op[1] != 0) && (op[2] != 0), stmnt)
}
pattern="(-*[0-9]+)[[:blank:]]*&&[[:blank:]]*(-*[0-9]+)"
while (match(stmnt, pattern, op) != 0)
{
sub(pattern, (op[1] != 0) && (op[2] != 0), stmnt)
}
pattern="0[[:blank:]]*&&[[:blank:]]*defined\\([A-Za-z0-9_]*\\)"
while (match(stmnt, pattern, op) != 0)
{
sub(pattern, 0, stmnt)
}
pattern="^\\+#(if|elif)[[:blank:]]*([01])[[:blank:]]*&&[[:blank:]]*(!*[[:blank:]]*defined[[:blank:]]*\\([[:blank:]]*[A-Za-z0-9_]*[[:blank:]]*\\))$"
while (match(stmnt, pattern, op) != 0)
{
stmnt = "+#" op[1] " " (op[2] != 0 ? op[3] : op[2])
}
pattern="^\\+#(if|elif)[[:blank:]]*(!*[[:blank:]]*defined[[:blank:]]*\\([[:blank:]]*[A-Za-z0-9_]*[[:blank:]]*\\))&&[[:blank:]]*([01])[[:blank:]]*$"
while (match(stmnt, pattern, op) != 0)
{
stmnt = "+#" op[1] " " (op[3] != 0 ? op[2] : op[3])
}
pattern="^\\+#(if|elif)[[:blank:]]*(!*[[:blank:]]*[A-Za-z0-9_]*)[[:blank:]]*&&[[:blank:]]*([01])[[:blank:]]*$"
while (match(stmnt, pattern, op) != 0)
{
stmnt = "+#" op[1] " " (op[3] != 0 ? op[2] : op[3])
}
pattern="(-*[0-9]+)[[:blank:]]*\\|\\|[[:blank:]]*(-*[0-9]+)"
while (match(stmnt, pattern, op) != 0)
{
sub(pattern, (op[1] != 0) || (op[2] != 0), stmnt)
}
pattern="^\\+#(if|elif)[[:blank:]]*([01])[[:blank:]]*\\|\\|[[:blank:]]*(!*[[:blank:]]*defined[[:blank:]]*\\([[:blank:]]*[A-Za-z0-9_]*[[:blank:]]*\\))$"
while (match(stmnt, pattern, op) != 0)
{
stmnt = "+#" op[1] " " (op[2] == 0 ? op[3] : op[2])
}
pattern="\\(([01])[[:blank:]]*\\|\\|[[:blank:]]*(!*[[:blank:]]*defined[[:blank:]]*\\([[:blank:]]*[A-Za-z0-9_]*[[:blank:]]*\\))\\)"
while (match(stmnt, pattern, op) != 0)
{
sub(pattern, op[1] == 0 ? op[2] : op[1], stmnt)
}
pattern="\\([[:blank:]]*(-*[0-9]+)[[:blank:]]*\\)"
while (match(stmnt, pattern, op) != 0)
{
sub(pattern, op[1], stmnt)
}
if (debug)
printf "/* debug specialize-patch: (c) %s -> %s */\n", last_stmnt, stmnt
} while (stmnt != last_stmnt)
return stmnt
}
# Evaluate !stmnt
function invert(stmnt) {
return evaluate(gensub("^\\+#if (.*)$", "+#if !(\\1)", "g", stmnt))
}
# Handle #if or #elif
function handle_if(evaluated)
{
# Only act on preprocessor conditional expressions with regard to the Linux
# kernel version, and do not interpret other expressions.
if ($0 ~ "LINUX_VERSION_CODE" \
|| $0 ~ "CONFIG_SCST_STRICT_SERIALIZING" \
|| $0 ~ "CREATE_SEND_MAD_HAS_AH_ARG" \
|| $0 ~ "CREATE_SEND_MAD_HAS_BASE_ARG" \
|| $0 ~ "ENABLE_NPIV" \
|| $0 ~ "FC_VPORT_CREATE_DEFINED" \
|| $0 ~ "HAVE_DEV_ATTR_MAX_RECV_SGE" \
|| $0 ~ "HAVE_DEV_ATTR_MAX_SEND_SGE" \
|| $0 ~ "HAVE_IB_DMA_MAP_OPS" \
|| $0 ~ "HAVE_IB_QUERY_DEVICE" \
|| $0 ~ "HAVE_IB_SET_CPI_RESP_TIME" \
|| $0 ~ "HAVE_IB_SG_DMA_LEN" \
|| $0 ~ "HAVE_RDMA_DESTROY_AH" \
|| $0 ~ "HAVE_RDMA_DESTROY_AH_WITH_FLAGS" \
|| $0 ~ "HAVE_RDMA_QUERY_GID" \
|| $0 ~ "HAVE_SRP_DATA_DESC_IMM" \
|| $0 ~ "HAVE_STRUCT_SRP_LOGIN_REQ_RDMA" \
|| $0 ~ "IB_CLIENT_ADD_ONE_RETURNS_INT" \
|| $0 ~ "IB_CLIENT_REMOVE_TAKES_TWO_ARGS" \
|| $0 ~ "IB_CM_LISTEN_TAKES_FOURTH_ARG" \
|| $0 ~ "IB_CM_LISTEN_TAKES_THIRD_ARG" \
|| $0 ~ "IB_CREATE_CQ_HAS_INIT_ATTR" \
|| $0 ~ "IB_PD_HAS_LOCAL_DMA_LKEY" \
|| $0 ~ "IB_QUERY_GID_HAS_ATTR_ARG" \
|| $0 ~ "INSIDE_KERNEL_TREE" \
|| $0 ~ "MAD_HANDLER_TAKES_SEND_BUF" \
|| $0 ~ "MOFED_MAJOR" \
|| $0 ~ "MOFED_MINOR" \
|| $0 ~ "RDMA_CREATE_ID_TAKES_NET_ARG" \
|| $0 ~ "RDMA_REJECT_HAS_FOUR_ARGS" \
|| $0 ~ "REGISTER_MAD_AGENT_HAS_FLAGS_ARG" \
|| $0 ~ "RHEL_MAJOR" \
|| $0 ~ "RHEL_MINOR" \
|| $0 ~ "RHEL_RELEASE_CODE" \
|| $0 ~ "SOCK_RECVMSG_HAS_FOUR_ARGS" \
|| $0 ~ "UEK_KABI_RENAME" \
|| $0 ~ "USE_PRE_440_WR_STRUCTURE" \
|| $0 ~ "_COMPAT_LINUX_MM_H" \
|| $0 ~ "bio_multiple_segments" \
|| generating_upstream_patch_defined \
&& $0 ~ "GENERATING_UPSTREAM_PATCH" \
|| $0 ~ "CONFIG_TCP_ZERO_COPY_TRANSFER_COMPLETION_NOTIFICATION" \
|| ($0 ~ "SCST_IO_CONTEXT" && SCST_IO_CONTEXT != ""))
{
}
else
{
evaluated = "+#if undecided"
}
if (debug)
printf "/* debug specialize-patch: (d) %s -> %s */\n", $0, evaluated
if (evaluated ~ "^\\+#if")
{
if_stmnt[if_nesting_level] = evaluated
any_section_output[if_nesting_level] = 0
decision[if_nesting_level] = evaluated
inv_decision[if_nesting_level] = evaluate(sprintf("+#if !%s", substr(evaluated, 6)))
if (debug)
printf "/* debug specialize-patch: (f) %s / %s */\n", \
decision[if_nesting_level], inv_decision[if_nesting_level]
}
else
{
sub("^\\+#elif ",
sprintf("+#if %s \\&\\& ", substr(inv_decision[if_nesting_level], 6)),
evaluated)
if (debug)
printf "/* debug specialize-patch: (e) %s */\n", evaluated
evaluated = evaluate(evaluated)
sub("^\\+#if", "+#elif", evaluated);
decision[if_nesting_level] = evaluated
inv_decision[if_nesting_level] \
= evaluate(sprintf("+#if %s && !%s", \
substr(inv_decision[if_nesting_level], 6), \
substr(evaluated, 8)))
if (debug)
printf "/* debug specialize-patch: (f) %s / %s */\n", \
decision[if_nesting_level], inv_decision[if_nesting_level]
}
return evaluated
}
# Decide whether or not to print the preprocessor statement $0.
function process_preprocessor_statement(evaluated, condition) {
evaluated = evaluate($0)
condition = 1
ei = evaluated_if_stmnt[if_nesting_level];
if (evaluated ~ "^\\+#if")
{
if_nesting_level++
evaluated_if_stmnt[if_nesting_level] = evaluated
evaluated = handle_if(evaluated)
}
else if (evaluated ~ "^\\+#elif")
{
if (if_discarded[if_nesting_level]) {
sub("^\\+[[:blank:]]*#[[:blank:]]*elif", "+#if", input_line[0])
if (debug)
printf "/* debug specialize-patch: (g0) -> %s */\n", evaluated
}
evaluated = handle_if(evaluated)
}
else if (evaluated ~ "^\\+#else")
{
decision[if_nesting_level] = inv_decision[if_nesting_level]
}
else if (evaluated ~ "^\\+#endif")
{
if_nesting_level--
}
else
{
condition = 0
}
if (condition)
{
output = 1
if (debug)
printf "/* debug specialize-patch: (g1a) if_nesting_level = %d */\n", \
if_nesting_level
for (i = if_nesting_level; i >= 0; i--) {
if (debug)
printf "/* debug specialize-patch: (g1b) %s: decision[%d] = %s */\n", \
evaluated, i, decision[i]
output = output && decision[i] !~ "^\\+#(if|elif) 0($| &&)"
}
if (output)
any_section_output[if_nesting_level] = 1
if (debug)
printf "/* debug specialize-patch: (g2) %s: output = %d */\n", \
evaluated, output
}
if (output && (!condition || \
decision[if_nesting_level + (evaluated ~ "^\\+#endif$")] \
!~ "^\\+#(el|)if [01]"))
{
if (evaluated == "+#if undecided" \
|| (evaluated !~ "^\\+#if" \
&& evaluated !~ "^\\+#elif" \
&& evaluated !~ "^\\+#endif"))
{
for (i = 0; i < input_line_count; i++)
line[lines++] = input_line[i]
} else {
# If the statement being processed is an #else or #endif that is not a
# header file include guard and if that statement has a trailing comment,
# replace that comment by the partially evaluated matching #if expression.
if (evaluated ~ "^\\+#else" || evaluated ~ "^\\+#endif") {
if ($0 ~ "\\*/") {
if ($0 ~ "_H_* \\*/$") {
evaluated = $0
} else {
if (ei ~ "^\\+#if ")
ei = substr(ei, 6)
else if (ei ~ "^\\+#ifdef")
ei = substr(ei, 9)
match($0, "([^/ ]*)[[:blank:]]*/\\*[^*]*\\*/[[:blank:]]*", arg)
evaluated = sprintf("%s /* %s */", arg[1], ei);
if (match(evaluated, "([^/ ]*) */\\* defined\\(([^()]*)\\) \\*/",
arg))
{
evaluated = sprintf("%s /* %s */", arg[1], arg[2])
}
}
} else {
evaluated = $0
}
if (debug)
printf "/* debug specialize-patch: (h) %s */\n", evaluated
}
line[lines++] = evaluated
lines_less_added += input_line_count - 1
}
}
else
{
discard = 1
if (lines >= 1 && line[lines - 1] == "+")
delete_next_blank_line = 1
}
if (evaluated ~ "^\\+#if")
if_discarded[if_nesting_level] = discard
}
function reset_hunk_state_variables() {
lines = 0
lines_less_added = 0
lines_less_deleted = 0
output = 1
if_nesting_level = -1
delete_next_blank_line = 0
h[0] = ""
}
function dump_lines() {
# Detect empty hunks
first_modif = -1
last_modif = -1
for (i = 0; i < lines; i++)
{
if (line[i] ~ "^[+-]")
{
if (first_modif < 0)
first_modif = i
last_modif = i
}
}
# Dump line[] as a hunk, but only if the hunk is not empty.
if (first_modif >= 0)
{
# Restore standard unified diff context after discarding added lines.
first_line = first_modif > context_lines ? first_modif - context_lines : 0
last_line = last_modif + context_lines < lines ? \
last_modif + context_lines : lines - 1
if (h[0] != "") {
old_start = h[1]
new_start = h[3] + new_line_adjustment
for (i = 0; i < first_line; i++) {
if (line[i] !~ "^\\+" && line[i] !~ "^\\\\")
old_start++
if (line[i] !~ "^-" && line[i] !~ "^\\\\")
new_start++
}
old_count = 0
new_count = 0
for (i = first_line; i <= last_line; i++) {
if (line[i] !~ "^\\+" && line[i] !~ "^\\\\")
old_count++
if (line[i] !~ "^-" && line[i] !~ "^\\\\")
new_count++
}
printf "@@ -%d,%d +%d,%d @@%s\n", old_start, old_count, \
new_start, new_count, h[5]
}
for (i = first_line; i <= last_line; i++) {
modifier = (LINUX_VERSION_CODE < version_code("4.19.0") &&
(RHEL_MAJOR == "" ||
RHEL_MAJOR * 256 + RHEL_MINOR < 7 * 256 + 7 ||
RHEL_MAJOR * 256 + RHEL_MINOR == 8 * 256 + 0) ?
"" : "const");
gsub("BAD_WR_MODIFIER", modifier, line[i])
gsub("CM_HANDLER_EVENT_MODIFIER", modifier, line[i])
print line[i]
}
}
if (h[0] != "")
new_line_adjustment += lines_less_deleted - lines_less_added
}
BEGIN {
# Verify arguments.
if (kernel_version == "")
{
printf "Error: kernel_version was not specified.\n"
exit 1
}
LINUX_VERSION_CODE = version_code(kernel_version)
if (LINUX_VERSION_CODE < version_number(3, 10, 0))
{
printf "Error: kernel version (%s) is not supported.\n", kernel_version
exit 1
}
if (blank_deleted_code != 0 && blank_deleted_code != 1)
blank_deleted_code = 0
if (generating_upstream_patch_defined != 0 && generating_upstream_patch_defined != 1)
generating_upstream_patch_defined = 0
if (config_tcp_zero_copy_transfer_completion_notification_undefined != 0 && config_tcp_zero_copy_transfer_completion_notification_undefined != 1)
config_tcp_zero_copy_transfer_completion_notification_undefined = 0
# Variable initialization.
context_lines = 3
process_file = 0
reset_hunk_state_variables()
}
{
if (match($0, "^diff[ \t]+[^ \t]+[ \t]+[^ \t]+[ \t]+([^ \t]+)$", filename) \
|| match($0, "^---[ \t]+([^ \t]+)[ \t]+", filename) \
|| match($0, "^\\+\\+\\+[ \t]+([^ \t]+)[ \t]+", filename))
{
# Start of new file.
dump_lines()
reset_hunk_state_variables()
new_line_adjustment = 0
process_file = match(filename[1], "\\.[ch]$") != 0 &&
match(filename[1], "drivers/scsi/qla2xxx/") == 0
}
if (!process_file)
{
sub("^\\+#ifdef INSIDE_KERNEL_TREE$", "+#if 1")
print
next
}
input_line[0] = $0
input_line_count = 1
# Join continued lines before processing these.
while (match($0, "\\\\$"))
{
previous_line = $0
sub("[ \t]*\\\\$", "", previous_line)
getline
input_line[input_line_count++] = $0
sub("^\\+[ \t]*", "", $0)
$0 = previous_line " " $0
}
discard = 0
# If the line currently being processed is a hunk header, print all lines
# that were stored in the array line[] since the last hunk header was read.
if (match($0, "^@@ -([0-9]*),([0-9]*) \\+([0-9]*),([0-9]*) @@(.*)$"))
{
# print h[1], h[2], h[3], h[4], h[5]
dump_lines()
reset_hunk_state_variables()
match($0, "^@@ -([0-9]*),([0-9]*) \\+([0-9]*),([0-9]*) @@(.*)$", h)
}
else if (delete_next_blank_line && $0 == "+")
{
discard = 1
delete_next_blank_line = 0
}
else if (lines >= 2 && !match(line[lines-2], ":$") &&
line[lines-1] == "+\x9return;" && $0 == "+}")
{
# Delete "return;" statements at the end of a function that are not
# preceded by a label.
line[lines-1] = $0
lines_less_added++
}
else
{
delete_next_blank_line = 0
if (match($0, "^\\+[[:blank:]]*#"))
{
if (debug)
printf "/* debug specialize-patch: line %d: %s*/\n", NR, $0
process_preprocessor_statement()
}
else if (output)
{
# Store the lines that were just read.
for (i = 0; i < input_line_count; i++)
line[lines++] = input_line[i]
# Convert double blank lines into a single blank line.
if (line[lines-1] == "+")
delete_next_blank_line = 1
}
else
{
discard = 1
if (lines >= 1 && line[lines-1] == "+")
delete_next_blank_line = 1
}
}
if (discard)
{
for (i = 0; i < input_line_count; i++)
{
if (blank_deleted_code)
{
if (input_line[i] ~ "^\\+")
line[lines++] = "+"
else
line[lines++] = input_line[i]
}
else
{
if (input_line[i] ~ "^\\+")
lines_less_added++
else if (input_line[i] ~ "^-")
lines_less_deleted++
}
}
}
}
END {
# Dump processed contents of the last read hunk.
dump_lines()
}
# Local variables:
# indent-tabs-mode: nil
# c-basic-offset: 2
# End:
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