crash: split vmcoreinfo exporting code out from crash_core.c

Now move the relevant codes into separate files:
kernel/crash_reserve.c, include/linux/crash_reserve.h.

And add config item CRASH_RESERVE to control its enabling.

And also update the old ifdeffery of CONFIG_CRASH_CORE, including of
<linux/crash_core.h> and config item dependency on CRASH_CORE
accordingly.

And also do renaming as follows:
 - arch/xxx/kernel/{crash_core.c => vmcore_info.c}
because they are only related to vmcoreinfo exporting on x86, arm64,
riscv.

And also Remove config item CRASH_CORE, and rely on CONFIG_KEXEC_CORE to
decide if build in crash_core.c.

[yang.lee@linux.alibaba.com: remove duplicated include in vmcore_info.c]
  Link: https://lkml.kernel.org/r/20240126005744.16561-1-yang.lee@linux.alibaba.com
Link: https://lkml.kernel.org/r/20240124051254.67105-3-bhe@redhat.com
Signed-off-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Acked-by: Hari Bathini <hbathini@linux.ibm.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Pingfan Liu <piliu@redhat.com>
Cc: Klara Modin <klarasmodin@gmail.com>
Cc: Michael Kelley <mhklinux@outlook.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 0 insertions, 39 deletions

diff --git a/arch/arm64/kernel/crash_core.c b/arch/arm64/kernel/crash_core.c
deleted file mode 100644
index 2a24199a9b81..000000000000
--- a/arch/arm64/kernel/crash_core.c
+++ /dev/null
@@ -1,39 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (C) Linaro.
- * Copyright (C) Huawei Futurewei Technologies.
- */
-
-#include <linux/crash_core.h>
-#include <asm/cpufeature.h>
-#include <asm/memory.h>
-#include <asm/pgtable-hwdef.h>
-#include <asm/pointer_auth.h>
-
-static inline u64 get_tcr_el1_t1sz(void);
-
-static inline u64 get_tcr_el1_t1sz(void)
-{
-	return (read_sysreg(tcr_el1) & TCR_T1SZ_MASK) >> TCR_T1SZ_OFFSET;
-}
-
-void arch_crash_save_vmcoreinfo(void)
-{
-	VMCOREINFO_NUMBER(VA_BITS);
-	/* Please note VMCOREINFO_NUMBER() uses "%d", not "%x" */
-	vmcoreinfo_append_str("NUMBER(MODULES_VADDR)=0x%lx\n", MODULES_VADDR);
-	vmcoreinfo_append_str("NUMBER(MODULES_END)=0x%lx\n", MODULES_END);
-	vmcoreinfo_append_str("NUMBER(VMALLOC_END)=0x%lx\n", VMALLOC_END);
-	vmcoreinfo_append_str("NUMBER(VMEMMAP_START)=0x%lx\n", VMEMMAP_START);
-	vmcoreinfo_append_str("NUMBER(VMEMMAP_END)=0x%lx\n", VMEMMAP_END);
-	vmcoreinfo_append_str("NUMBER(kimage_voffset)=0x%llx\n",
-						kimage_voffset);
-	vmcoreinfo_append_str("NUMBER(PHYS_OFFSET)=0x%llx\n",
-						PHYS_OFFSET);
-	vmcoreinfo_append_str("NUMBER(TCR_EL1_T1SZ)=0x%llx\n",
-						get_tcr_el1_t1sz());
-	vmcoreinfo_append_str("KERNELOFFSET=%lx\n", kaslr_offset());
-	vmcoreinfo_append_str("NUMBER(KERNELPACMASK)=0x%llx\n",
-						system_supports_address_auth() ?
-						ptrauth_kernel_pac_mask() : 0);
-}