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Commit 6536c5f2 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'powerpc-5.1-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux 

Pull powerpc fixes from Michael Ellerman:
 "Three non-regression fixes.

   - Our optimised memcmp could read past the end of one of the buffers
     and potentially trigger a page fault leading to an oops.

   - Some of our code to read energy management data on PowerVM had an
     endian bug leading to bogus results.

   - When reporting a machine check exception we incorrectly reported
     TLB multihits as D-Cache multhits due to a missing entry in the
     array of causes.

  Thanks to: Chandan Rajendra, Gautham R. Shenoy, Mahesh Salgaonkar,
  Segher Boessenkool, Vaidyanathan Srinivasan"

* tag 'powerpc-5.1-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/pseries/mce: Fix misleading print for TLB mutlihit
  powerpc/pseries/energy: Use OF accessor functions to read ibm,drc-indexes
  powerpc/64: Fix memcmp reading past the end of src/dest
parents c877b3df 6f845ebe

arch/powerpc/lib/memcmp_64.S

+13 −4
Original line number Diff line number Diff line
@@ -215,11 +215,20 @@ _GLOBAL_TOC(memcmp) 
	beq	.Lzero



.Lcmp_rest_lt8bytes:

	/* Here we have only less than 8 bytes to compare with. at least s1

	 * Address is aligned with 8 bytes.

	 * The next double words are load and shift right with appropriate

	 * bits.

	/*

	 * Here we have less than 8 bytes to compare. At least s1 is aligned to

	 * 8 bytes, but s2 may not be. We must make sure s2 + 7 doesn't cross a

	 * page boundary, otherwise we might read past the end of the buffer and

	 * trigger a page fault. We use 4K as the conservative minimum page

	 * size. If we detect that case we go to the byte-by-byte loop.

	 *

	 * Otherwise the next double word is loaded from s1 and s2, and shifted

	 * right to compare the appropriate bits.

	 */

	clrldi	r6,r4,(64-12)	// r6 = r4 & 0xfff

	cmpdi	r6,0xff8

	bgt	.Lshort



	subfic  r6,r5,8

	slwi	r6,r6,3

	LD	rA,0,r3

arch/powerpc/platforms/pseries/pseries_energy.c

+18 −9
Original line number Diff line number Diff line
@@ -77,18 +77,27 @@ static u32 cpu_to_drc_index(int cpu) 


		ret = drc.drc_index_start + (thread_index * drc.sequential_inc);

	} else {

		const __be32 *indexes;



		indexes = of_get_property(dn, "ibm,drc-indexes", NULL);

		if (indexes == NULL)

			goto err_of_node_put;

		u32 nr_drc_indexes, thread_drc_index;



		/*

		 * The first element indexes[0] is the number of drc_indexes

		 * returned in the list.  Hence thread_index+1 will get the

		 * drc_index corresponding to core number thread_index.

		 * The first element of ibm,drc-indexes array is the

		 * number of drc_indexes returned in the list.  Hence

		 * thread_index+1 will get the drc_index corresponding

		 * to core number thread_index.

		 */

		ret = indexes[thread_index + 1];

		rc = of_property_read_u32_index(dn, "ibm,drc-indexes",

						0, &nr_drc_indexes);

		if (rc)

			goto err_of_node_put;



		WARN_ON_ONCE(thread_index > nr_drc_indexes);

		rc = of_property_read_u32_index(dn, "ibm,drc-indexes",

						thread_index + 1,

						&thread_drc_index);

		if (rc)

			goto err_of_node_put;



		ret = thread_drc_index;

	}



	rc = 0;

arch/powerpc/platforms/pseries/ras.c

+1 −0
Original line number Diff line number Diff line
@@ -550,6 +550,7 @@ static void pseries_print_mce_info(struct pt_regs *regs, 
		"UE",

		"SLB",

		"ERAT",

		"Unknown",

		"TLB",

		"D-Cache",

		"Unknown",