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Unverified Commit 8ce355cf authored by Paul Burton's avatar Paul Burton Committed by James Hogan
Browse files

MIPS: Setup boot_command_line before plat_mem_setup 



Platforms using DT will typically call __dt_setup_arch from
plat_mem_setup. This in turn calls early_init_dt_scan. When
CONFIG_CMDLINE is set, this leads to its value being copied into
boot_command_line by early_init_dt_scan_chosen. If this happens before
the code setting up boot_command_line in arch_mem_init runs, that code
will go on to append CONFIG_CMDLINE (via builtin_cmdline) to
boot_command_line again, duplicating it. For some command line
parameters (eg. earlycon) this can be a problem. Set up
boot_command_line before early_init_dt_scan_chosen gets called such that
it will not write CONFIG_CMDLINE in this scenario & the arguments aren't
duplicated.

Signed-off-by: default avatarPaul Burton <paul.burton@mips.com>
Acked-by: default avatarMathieu Malaterre <malat@debian.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Maarten ter Huurne <maarten@treewalker.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/18483/


Signed-off-by: default avatarJames Hogan <jhogan@kernel.org>
parent 7a01c190

arch/mips/kernel/setup.c

+20 −19
Original line number Diff line number Diff line
@@ -826,25 +826,6 @@ static void __init arch_mem_init(char **cmdline_p) 
	struct memblock_region *reg;

	extern void plat_mem_setup(void);



	/* call board setup routine */

	plat_mem_setup();



	/*

	 * Make sure all kernel memory is in the maps.  The "UP" and

	 * "DOWN" are opposite for initdata since if it crosses over

	 * into another memory section you don't want that to be

	 * freed when the initdata is freed.

	 */

	arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,

			 PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,

			 BOOT_MEM_RAM);

	arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,

			 PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,

			 BOOT_MEM_INIT_RAM);



	pr_info("Determined physical RAM map:\n");

	print_memory_map();



#if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)

	strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);

#else
@@ -872,6 +853,26 @@ static void __init arch_mem_init(char **cmdline_p) 
	}

#endif

#endif



	/* call board setup routine */

	plat_mem_setup();



	/*

	 * Make sure all kernel memory is in the maps.  The "UP" and

	 * "DOWN" are opposite for initdata since if it crosses over

	 * into another memory section you don't want that to be

	 * freed when the initdata is freed.

	 */

	arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,

			 PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,

			 BOOT_MEM_RAM);

	arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,

			 PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,

			 BOOT_MEM_INIT_RAM);



	pr_info("Determined physical RAM map:\n");

	print_memory_map();



	strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);



	*cmdline_p = command_line;