enable ide's etc. to work on bpf.c files (sched-ext#668)

* enable ide's etc. to work on the bpf.c files
this makes it so that clangd and ide tools which use clangd
can work on the bpf.c code.

nothing should actually be changed outside of that ide/editor
environment, all the changes are ifdef'ed on LSP which is set
in the added .clangd file.

* move intf include out of both sides of ifdef toggle

.clangd

@@ -0,0 +1,2 @@
+CompileFlags:
+  Add: [-DLSP, -Wno-missing-declarations, -Wno-typedef-redefinition, -Wno-ignored-attributes, -xc]

rust/scx_rustland_core/assets/bpf/main.bpf.c

@@ -27,7 +27,13 @@
  * This software may be used and distributed according to the terms of the
  * GNU General Public License version 2.
  */
+#ifdef LSP
+#define __bpf__
+#include "../../../../scheds/include/scx/common.bpf.h"
+#else
 #include <scx/common.bpf.h>
+#endif
+
 #include "intf.h"
 
 char _license[] SEC("license") = "GPL";

scheds/include/scx/common.bpf.h

@@ -7,7 +7,13 @@
 #ifndef __SCX_COMMON_BPF_H
 #define __SCX_COMMON_BPF_H
 
+#ifdef LSP
+#define __bpf__
+#include "../vmlinux/vmlinux.h"
+#else
 #include "vmlinux.h"
+#endif
+
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
 #include <asm-generic/errno.h>

scheds/include/scx/user_exit_info.h

@@ -25,7 +25,11 @@ struct user_exit_info {
 
 #ifdef __bpf__
 
+#ifdef LSP
+#include "../vmlinux/vmlinux.h"
+#else
 #include "vmlinux.h"
+#endif
 #include <bpf/bpf_core_read.h>
 
 #define UEI_DEFINE(__name)							\

scheds/rust/scx_layered/src/bpf/intf.h

@@ -20,7 +20,12 @@ typedef unsigned u32;
 typedef unsigned long long u64;
 #endif
 
+#ifdef LSP
+#define __bpf__
+#include "../../../../include/scx/ravg.bpf.h"
+#else
 #include <scx/ravg.bpf.h>
+#endif
 
 enum consts {
 	MAX_CPUS_SHIFT		= 9,

scheds/rust/scx_layered/src/bpf/main.bpf.c

@@ -1,6 +1,13 @@
 /* Copyright (c) Meta Platforms, Inc. and affiliates. */
+#ifdef LSP
+#define __bpf__
+#include "../../../../include/scx/common.bpf.h"
+#include "../../../../include/scx/ravg_impl.bpf.h"
+#else
 #include <scx/common.bpf.h>
 #include <scx/ravg_impl.bpf.h>
+#endif
+
 #include "intf.h"
 
 #include <errno.h>

scheds/rust/scx_mitosis/src/bpf/intf.h

@@ -11,7 +11,12 @@ typedef unsigned int u32;
 typedef _Bool bool;
 #endif
 
+#ifdef LSP
+#define __bpf__
+#include "../../../../include/scx/ravg.bpf.h"
+#else
 #include <scx/ravg.bpf.h>
+#endif
 
 enum consts {
 	MAX_CPUS_SHIFT = 9,

scheds/rust/scx_mitosis/src/bpf/mitosis.bpf.c

@@ -11,9 +11,18 @@
  * Each cell has an associated DSQ which it uses for vtime scheduling of the
  * cgroups belonging to the cell.
  */
+
 #include "intf.h"
+
+#ifdef LSP
+#define __bpf__ 
+#include "../../../../include/scx/common.bpf.h"
+#include "../../../../include/scx/ravg_impl.bpf.h"
+#else
 #include <scx/common.bpf.h>
 #include <scx/ravg_impl.bpf.h>
+#endif
+
 
 char _license[] SEC("license") = "GPL";
 

scheds/rust/scx_rusty/src/bpf/intf.h

@@ -19,7 +19,12 @@ typedef unsigned int u32;
 typedef unsigned long long u64;
 #endif
 
+#ifdef LSP
+#define __bpf__
+#include "../../../../include/scx/ravg.bpf.h"
+#else
 #include <scx/ravg.bpf.h>
+#endif
 
 enum consts {
 	MAX_CPUS		= 512,

scheds/rust/scx_rusty/src/bpf/main.bpf.c

@@ -35,8 +35,16 @@
  * task weight, dom mask and current dom in the task_data map and executes the
  * load balance based on userspace populating the lb_data map.
  */
+
+#ifdef LSP
+#define __bpf__
+#include "../../../../include/scx/common.bpf.h"
+#include "../../../../include/scx/ravg_impl.bpf.h"
+#else
 #include <scx/common.bpf.h>
 #include <scx/ravg_impl.bpf.h>
+#endif
+
 #include "intf.h"
 
 #include <errno.h>