From dea7d0054594089ee107fadd597ad3674c398aff Mon Sep 17 00:00:00 2001
From: Masamichi Takagi <masamichi.takagi@riken.jp>
Date: Fri, 12 Jun 2020 11:58:46 +0900
Subject: [PATCH] force allow_oversubscribe (workaround for Fugaku)

Change-Id: I5288f5ccbd967004fabbe71bca267feed3b9c2f8
---
 kernel/syscall.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/syscall.c b/kernel/syscall.c
index f8f5225a..424ee9ea 100644
--- a/kernel/syscall.c
+++ b/kernel/syscall.c
@@ -1751,6 +1751,7 @@ do_mmap(const uintptr_t addr0, const size_t len0, const int prot,
 		populated_mapping = 1;
 	}
 
+#if 0
 	/* XXX: Intel MPI 128MB mapping.. */
 	if (len == 134217728) {
 		dkprintf("%s: %ld bytes mapping -> no prefault\n",
@@ -1758,6 +1759,7 @@ do_mmap(const uintptr_t addr0, const size_t len0, const int prot,
 		vrflags |= VR_DEMAND_PAGING;
 		populated_mapping = 0;
 	}
+#endif
 
 	if ((flags & MAP_ANONYMOUS) && !(prot & PROT_WRITE)) {
 		error = set_host_vma(addr, len, PROT_READ | PROT_EXEC, 1/* holding memory_range_lock */);
@@ -2751,7 +2753,9 @@ unsigned long do_fork(int clone_flags, unsigned long newsp,
 	struct syscall_request request1 IHK_DMA_ALIGN;
 	int ptrace_event = 0;
 	int termsig = clone_flags & 0x000000ff;
+#if 0
 	const struct ihk_mc_cpu_info *cpu_info = ihk_mc_get_cpu_info();
+#endif
 	int err = 0;
 
 	dkprintf("%s,flags=%08x,newsp=%lx,ptidptr=%lx,"
@@ -2794,10 +2798,12 @@ unsigned long do_fork(int clone_flags, unsigned long newsp,
 		return -EINVAL;
 	}
 
+#if 0
 	if (!allow_oversubscribe && rusage.num_threads >= cpu_info->ncpus) {
 		kprintf("%s: ERROR: CPU oversubscription is not allowed. Specify -O option in mcreboot.sh to allow it.\n", __FUNCTION__);
 		return -EINVAL;
 	}
+#endif
 
 	if (oldproc->coredump_barrier_count) {
 		return -EINVAL;