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Commit 505569d2 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull x86 fixes from Ingo Molnar:
 "Misc fixes: two vdso fixes, two kbuild fixes and a boot failure fix
  with certain odd memory mappings"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86, vdso: Use asm volatile in __getcpu
  x86/build: Clean auto-generated processor feature files
  x86: Fix mkcapflags.sh bash-ism
  x86: Fix step size adjustment during initial memory mapping
  x86_64, vdso: Fix the vdso address randomization algorithm
parents 5ab551d6 2aba73a6

arch/x86/boot/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -51,6 +51,7 @@ targets += cpustr.h 
$(obj)/cpustr.h: $(obj)/mkcpustr FORCE

	$(call if_changed,cpustr)

endif

clean-files += cpustr.h



# ---------------------------------------------------------------------------

arch/x86/include/asm/vgtod.h

+4 −2
Original line number Diff line number Diff line
@@ -80,9 +80,11 @@ static inline unsigned int __getcpu(void) 


	/*

	 * Load per CPU data from GDT.  LSL is faster than RDTSCP and

	 * works on all CPUs.

	 * works on all CPUs.  This is volatile so that it orders

	 * correctly wrt barrier() and to keep gcc from cleverly

	 * hoisting it out of the calling function.

	 */

	asm("lsl %1,%0" : "=r" (p) : "r" (__PER_CPU_SEG));

	asm volatile ("lsl %1,%0" : "=r" (p) : "r" (__PER_CPU_SEG));



	return p;

}

arch/x86/kernel/cpu/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -66,3 +66,4 @@ targets += capflags.c 
$(obj)/capflags.c: $(cpufeature) $(src)/mkcapflags.sh FORCE

	$(call if_changed,mkcapflags)

endif

clean-files += capflags.c

arch/x86/kernel/cpu/mkcapflags.sh

+1 −1
Original line number Diff line number Diff line
@@ -28,7 +28,7 @@ function dump_array() 
		# If the /* comment */ starts with a quote string, grab that.

		VALUE="$(echo "$i" | sed -n 's@.*/\* *\("[^"]*"\).*\*/@\1@p')"

		[ -z "$VALUE" ] && VALUE="\"$NAME\""

		[ "$VALUE" == '""' ] && continue

		[ "$VALUE" = '""' ] && continue



		# Name is uppercase, VALUE is all lowercase

		VALUE="$(echo "$VALUE" | tr A-Z a-z)"

arch/x86/mm/init.c

+17 −20
Original line number Diff line number Diff line
@@ -438,20 +438,20 @@ static unsigned long __init init_range_memory_mapping( 
static unsigned long __init get_new_step_size(unsigned long step_size)

{

	/*

	 * Explain why we shift by 5 and why we don't have to worry about

	 * 'step_size << 5' overflowing:

	 *

	 * initial mapped size is PMD_SIZE (2M).

	 * Initial mapped size is PMD_SIZE (2M).

	 * We can not set step_size to be PUD_SIZE (1G) yet.

	 * In worse case, when we cross the 1G boundary, and

	 * PG_LEVEL_2M is not set, we will need 1+1+512 pages (2M + 8k)

	 * to map 1G range with PTE. Use 5 as shift for now.

	 * to map 1G range with PTE. Hence we use one less than the

	 * difference of page table level shifts.

	 *

	 * Don't need to worry about overflow, on 32bit, when step_size

	 * is 0, round_down() returns 0 for start, and that turns it

	 * into 0x100000000ULL.

	 * Don't need to worry about overflow in the top-down case, on 32bit,

	 * when step_size is 0, round_down() returns 0 for start, and that

	 * turns it into 0x100000000ULL.

	 * In the bottom-up case, round_up(x, 0) returns 0 though too, which

	 * needs to be taken into consideration by the code below.

	 */

	return step_size << 5;

	return step_size << (PMD_SHIFT - PAGE_SHIFT - 1);

}



/**
@@ -471,7 +471,6 @@ static void __init memory_map_top_down(unsigned long map_start, 
	unsigned long step_size;

	unsigned long addr;

	unsigned long mapped_ram_size = 0;

	unsigned long new_mapped_ram_size;



	/* xen has big range in reserved near end of ram, skip it at first.*/

	addr = memblock_find_in_range(map_start, map_end, PMD_SIZE, PMD_SIZE);
@@ -496,14 +495,12 @@ static void __init memory_map_top_down(unsigned long map_start, 
				start = map_start;

		} else

			start = map_start;

		new_mapped_ram_size = init_range_memory_mapping(start,

		mapped_ram_size += init_range_memory_mapping(start,

							last_start);

		last_start = start;

		min_pfn_mapped = last_start >> PAGE_SHIFT;

		/* only increase step_size after big range get mapped */

		if (new_mapped_ram_size > mapped_ram_size)

		if (mapped_ram_size >= step_size)

			step_size = get_new_step_size(step_size);

		mapped_ram_size += new_mapped_ram_size;

	}



	if (real_end < map_end)
@@ -524,7 +521,7 @@ static void __init memory_map_top_down(unsigned long map_start, 
static void __init memory_map_bottom_up(unsigned long map_start,

					unsigned long map_end)

{

	unsigned long next, new_mapped_ram_size, start;

	unsigned long next, start;

	unsigned long mapped_ram_size = 0;

	/* step_size need to be small so pgt_buf from BRK could cover it */

	unsigned long step_size = PMD_SIZE;
@@ -539,19 +536,19 @@ static void __init memory_map_bottom_up(unsigned long map_start, 
	 * for page table.

	 */

	while (start < map_end) {

		if (map_end - start > step_size) {

		if (step_size && map_end - start > step_size) {

			next = round_up(start + 1, step_size);

			if (next > map_end)

				next = map_end;

		} else

		} else {

			next = map_end;

		}



		new_mapped_ram_size = init_range_memory_mapping(start, next);

		mapped_ram_size += init_range_memory_mapping(start, next);

		start = next;



		if (new_mapped_ram_size > mapped_ram_size)

		if (mapped_ram_size >= step_size)

			step_size = get_new_step_size(step_size);

		mapped_ram_size += new_mapped_ram_size;

	}

}