Commit 23721c8e authored by Mike Rapoport's avatar Mike Rapoport Committed by Borislav Petkov
Browse files

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: default avatarMike Rapoport <rppt@linux.ibm.com>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210601075354.5149-4-rppt@kernel.org
parent 1a6a9044

arch/x86/include/asm/crash.h

+0 −6
Original line number Diff line number Diff line
@@ -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 */

arch/x86/kernel/crash.c

+0 −13
Original line number Diff line number Diff line
@@ -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)