Commit d574ffa1 authored by WANG Chao's avatar WANG Chao Committed by Thomas Gleixner
Browse files

x86, e820: Clean up sanitize_e820_map() users 



The argument 3 of sanitize_e820_map() will only be updated upon a
successful sanitization. Some of the callers have extra conditionals
for the same purpose. Clean them up.

default_machine_specific_memory_setup() must keep the extra
conditional because boot_params.e820_entries is an u8 and not an u32,
so the direct update would overwrite other fields in boot_params.

[ tglx: Massaged changelog ]

Signed-off-by: default avatarWANG Chao <chaowang@redhat.com>
Acked-by: default avatarDavid Rientjes <rientjes@google.com>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Lee Chun-Yi <joeyli.kernel@gmail.com>
Cc: Xishi Qiu <qiuxishi@huawei.com>
Link: http://lkml.kernel.org/r/1420601859-18439-1-git-send-email-chaowang@redhat.com


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 7389882c

arch/x86/kernel/e820.c

+8 −18
Original line number Diff line number Diff line
@@ -184,9 +184,9 @@ void __init e820_print_map(char *who) 
 * overwritten in the same location, starting at biosmap.

 *

 * The integer pointed to by pnr_map must be valid on entry (the

 * current number of valid entries located at biosmap) and will

 * be updated on return, with the new number of valid entries

 * (something no more than max_nr_map.)

 * current number of valid entries located at biosmap). If the

 * sanitizing succeeds the *pnr_map will be updated with the new

 * number of valid entries (something no more than max_nr_map).

 *

 * The return value from sanitize_e820_map() is zero if it

 * successfully 'sanitized' the map entries passed in, and is -1
@@ -561,23 +561,15 @@ u64 __init e820_remove_range(u64 start, u64 size, unsigned old_type, 


void __init update_e820(void)

{

	u32 nr_map;



	nr_map = e820.nr_map;

	if (sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &nr_map))

	if (sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map))

		return;

	e820.nr_map = nr_map;

	printk(KERN_INFO "e820: modified physical RAM map:\n");

	e820_print_map("modified");

}

static void __init update_e820_saved(void)

{

	u32 nr_map;



	nr_map = e820_saved.nr_map;

	if (sanitize_e820_map(e820_saved.map, ARRAY_SIZE(e820_saved.map), &nr_map))

		return;

	e820_saved.nr_map = nr_map;

	sanitize_e820_map(e820_saved.map, ARRAY_SIZE(e820_saved.map),

				&e820_saved.nr_map);

}

#define MAX_GAP_END 0x100000000ull

/*
@@ -898,11 +890,9 @@ early_param("memmap", parse_memmap_opt); 
void __init finish_e820_parsing(void)

{

	if (userdef) {

		u32 nr = e820.nr_map;



		if (sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &nr) < 0)

		if (sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map),

					&e820.nr_map) < 0)

			early_panic("Invalid user supplied memory map");

		e820.nr_map = nr;



		printk(KERN_INFO "e820: user-defined physical RAM map:\n");

		e820_print_map("user");

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