linux-kernel - [PATCH 4/7] x86: kexec_file: remove X86_64 dependency from prepare_elf64

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Date:   Tue, 27 Feb 2018 13:48:11 +0900
From:   AKASHI Takahiro <takahiro.akashi@...aro.org>
To:     dyoung@...hat.com, vgoyal@...hat.com, bhe@...hat.com,
        mpe@...erman.id.au, bauerman@...ux.vnet.ibm.com,
        prudo@...ux.vnet.ibm.com
Cc:     kexec@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        AKASHI Takahiro <takahiro.akashi@...aro.org>
Subject: [PATCH 4/7] x86: kexec_file: remove X86_64 dependency from prepare_elf64_headers()

The code guarded by CONFIG_X86_64 is necessary on some architectures
which have a dedicated kernel mapping outside of linear memory mapping.
(arm64 is among those.)

In this patch, an additional argument, kernel_map, is added to enable/
disable the code removing #ifdef.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
Cc: Dave Young <dyoung@...hat.com>
Cc: Vivek Goyal <vgoyal@...hat.com>
Cc: Baoquan He <bhe@...hat.com>
---
 arch/x86/kernel/crash.c | 25 +++++++++++++------------
 1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
index 2123fa0efc17..913fd8021f8a 100644
--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -347,7 +347,7 @@ static int prepare_elf64_ram_headers_callback(struct resource *res, void *arg)
 	return 0;
 }
 
-static int prepare_elf64_headers(struct crash_elf_data *ced,
+static int prepare_elf64_headers(struct crash_elf_data *ced, int kernel_map,
 		void **addr, unsigned long *sz)
 {
 	Elf64_Ehdr *ehdr;
@@ -414,17 +414,17 @@ static int prepare_elf64_headers(struct crash_elf_data *ced,
 	phdr->p_filesz = phdr->p_memsz = VMCOREINFO_NOTE_SIZE;
 	(ehdr->e_phnum)++;
 
-#ifdef CONFIG_X86_64
 	/* Prepare PT_LOAD type program header for kernel text region */
-	phdr = (Elf64_Phdr *)bufp;
-	bufp += sizeof(Elf64_Phdr);
-	phdr->p_type = PT_LOAD;
-	phdr->p_flags = PF_R|PF_W|PF_X;
-	phdr->p_vaddr = (Elf64_Addr)_text;
-	phdr->p_filesz = phdr->p_memsz = _end - _text;
-	phdr->p_offset = phdr->p_paddr = __pa_symbol(_text);
-	(ehdr->e_phnum)++;
-#endif
+	if (kernel_map) {
+		phdr = (Elf64_Phdr *)bufp;
+		bufp += sizeof(Elf64_Phdr);
+		phdr->p_type = PT_LOAD;
+		phdr->p_flags = PF_R|PF_W|PF_X;
+		phdr->p_vaddr = (Elf64_Addr)_text;
+		phdr->p_filesz = phdr->p_memsz = _end - _text;
+		phdr->p_offset = phdr->p_paddr = __pa_symbol(_text);
+		(ehdr->e_phnum)++;
+	}
 
 	/* Go through all the ranges in cmem->ranges[] and prepare phdr */
 	for (i = 0; i < cmem->nr_ranges; i++) {
@@ -477,7 +477,8 @@ static int prepare_elf_headers(struct kimage *image, void **addr,
 		goto out;
 
 	/* By default prepare 64bit headers */
-	ret =  prepare_elf64_headers(ced, addr, sz);
+	ret =  prepare_elf64_headers(ced,
+				(int)IS_ENABLED(CONFIG_X86_64), addr, sz);
 	if (ret)
 		goto out;
 
-- 
2.16.2