[tip: x86/cleanups] x86/crash: Remove crash_reserve_low_1M()

[tip-bot2 for Mike Rapoport]

The following commit has been merged into the x86/cleanups branch of tip:

Commit-ID:     23721c8e92f73f9f89e7362c50c2996a5c9ad483
Gitweb:        https://git.kernel.org/tip/23721c8e92f73f9f89e7362c50c2996a5c9ad483
Author:        Mike Rapoport <rppt@xxxxxxxxxxxxx>
AuthorDate:    Tue, 01 Jun 2021 10:53:54 +03:00
Committer:     Borislav Petkov <bp@xxxxxxx>
CommitterDate: Mon, 07 Jun 2021 12:14:45 +02:00

x86/crash: Remove crash_reserve_low_1M()

The entire memory range under 1M is unconditionally reserved in
setup_arch(), so there is no need for crash_reserve_low_1M() anymore.

Remove this function.

Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Link: https://lkml.kernel.org/r/20210601075354.5149-4-rppt@xxxxxxxxxx
---
 arch/x86/include/asm/crash.h |  6 ------
 arch/x86/kernel/crash.c      | 13 -------------
 2 files changed, 19 deletions(-)

diff --git a/arch/x86/include/asm/crash.h b/arch/x86/include/asm/crash.h
index f58de66..8b6bd63 100644
--- a/arch/x86/include/asm/crash.h
+++ b/arch/x86/include/asm/crash.h
@@ -9,10 +9,4 @@ int crash_setup_memmap_entries(struct kimage *image,
 		struct boot_params *params);
 void crash_smp_send_stop(void);
 
-#ifdef CONFIG_KEXEC_CORE
-void __init crash_reserve_low_1M(void);
-#else
-static inline void __init crash_reserve_low_1M(void) { }
-#endif
-
 #endif /* _ASM_X86_CRASH_H */
diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
index 54ce999..e8326a8 100644
--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -70,19 +70,6 @@ static inline void cpu_crash_vmclear_loaded_vmcss(void)
 	rcu_read_unlock();
 }
 
-/*
- * When the crashkernel option is specified, only use the low
- * 1M for the real mode trampoline.
- */
-void __init crash_reserve_low_1M(void)
-{
-	if (cmdline_find_option(boot_command_line, "crashkernel", NULL, 0) < 0)
-		return;
-
-	memblock_reserve(0, 1<<20);
-	pr_info("Reserving the low 1M of memory for crashkernel\n");
-}
-
 #if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC)
 
 static void kdump_nmi_callback(int cpu, struct pt_regs *regs)