linux-kernel - [PATCH v4 01/10] crash_dump: Make elfcorehdr

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Date:   Wed, 14 Jul 2021 14:50:11 +0200
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Rob Herring <robh+dt@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Nicolas Pitre <nico@...xnic.net>,
        Ard Biesheuvel <ardb@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Nick Kossifidis <mick@....forth.gr>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Frank Rowand <frowand.list@...il.com>,
        Dave Young <dyoung@...hat.com>, Mike Rapoport <rppt@...nel.org>
Cc:     Baoquan He <bhe@...hat.com>, Vivek Goyal <vgoyal@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, kexec@...ts.infradead.org,
        linux-mm@...ck.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH v4 01/10] crash_dump: Make elfcorehdr_{addr,size} always visible

Make the forward declarations of elfcorehdr_addr and elfcorehdr_size
always available, like is done for phys_initrd_start and
phys_initrd_size.  Code referring to these symbols can then just check
for IS_ENABLED(CONFIG_CRASH_DUMP), instead of requiring conditional
compilation using an #ifdef, thus preparing to increase compile
coverage.

Suggested-by: Rob Herring <robh+dt@...nel.org>
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
v4:
  - New.
---
 include/linux/crash_dump.h | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/include/linux/crash_dump.h b/include/linux/crash_dump.h
index a5192b718dbe4f9a..ad31893d13d634de 100644
--- a/include/linux/crash_dump.h
+++ b/include/linux/crash_dump.h
@@ -10,13 +10,14 @@
 
 #include <linux/pgtable.h> /* for pgprot_t */
 
+/* For IS_ENABLED(CONFIG_CRASH_DUMP) */
+extern unsigned long long elfcorehdr_addr;
+extern unsigned long long elfcorehdr_size;
+
 #ifdef CONFIG_CRASH_DUMP
 #define ELFCORE_ADDR_MAX	(-1ULL)
 #define ELFCORE_ADDR_ERR	(-2ULL)
 
-extern unsigned long long elfcorehdr_addr;
-extern unsigned long long elfcorehdr_size;
-
 extern int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size);
 extern void elfcorehdr_free(unsigned long long addr);
 extern ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos);
-- 
2.25.1