Commit 449fbd71 authored by Heiko Carstens's avatar Heiko Carstens
Browse files

s390/hwcaps: use consistent coding style / remove comments 



Use a consistent coding style within setup_hwcaps() and remove obvious
and outdated comments.

Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
parent 251527c9

arch/s390/kernel/processor.c

+13 −54
Original line number Diff line number Diff line
@@ -177,30 +177,8 @@ static void show_cpu_summary(struct seq_file *m, void *v) 
	}

}



/*

 * Setup hardware capabilities.

 */

static int __init setup_hwcaps(void)

{

	/*

	 * The store facility list bits numbers as found in the principles

	 * of operation are numbered with bit 1UL<<31 as number 0 to

	 * bit 1UL<<0 as number 31.

	 *   Bit 0: instructions named N3, "backported" to esa-mode

	 *   Bit 2: z/Architecture mode is active

	 *   Bit 7: the store-facility-list-extended facility is installed

	 *   Bit 17: the message-security assist is installed

	 *   Bit 19: the long-displacement facility is installed

	 *   Bit 21: the extended-immediate facility is installed

	 *   Bit 22: extended-translation facility 3 is installed

	 *   Bit 30: extended-translation facility 3 enhancement facility

	 * These get translated to:

	 *   HWCAP_ESAN3 bit 0, HWCAP_ZARCH bit 1,

	 *   HWCAP_STFLE bit 2, HWCAP_MSA bit 3,

	 *   HWCAP_LDISP bit 4, HWCAP_EIMM bit 5 and

	 *   HWCAP_ETF3EH bit 8 (22 && 30).

	 */



	/* instructions named N3, "backported" to esa-mode */

	if (test_facility(0))

		elf_hwcap |= HWCAP_ESAN3;
@@ -225,47 +203,28 @@ static int __init setup_hwcaps(void) 
	if (test_facility(21))

		elf_hwcap |= HWCAP_EIMM;



	/* extended-translation facility 3 enhancement */

	if (test_facility(22) && test_facility(30))

		elf_hwcap |= HWCAP_ETF3EH;



	/*

	 * Check for additional facilities with store-facility-list-extended.

	 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0

	 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information

	 * as stored by stfl, bits 32-xxx contain additional facilities.

	 * How many facility words are stored depends on the number of

	 * doublewords passed to the instruction. The additional facilities

	 * are:

	 *   Bit 42: decimal floating point facility is installed

	 *   Bit 44: perform floating point operation facility is installed

	 * translated to:

	 *   HWCAP_DFP bit 6 (42 && 44).

	 */

	/* decimal floating point & perform floating point operation */

	if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))

		elf_hwcap |= HWCAP_DFP;



	/*

	 * Huge page support HWCAP_HPAGE is bit 7.

	 */

	/* huge page support */

	if (MACHINE_HAS_EDAT1)

		elf_hwcap |= HWCAP_HPAGE;



	/*

	 * 64-bit register support for 31-bit processes

	 * HWCAP_HIGH_GPRS is bit 9.

	 */

	/* 64-bit register support for 31-bit processes */

	elf_hwcap |= HWCAP_HIGH_GPRS;



	/*

	 * Transactional execution support HWCAP_TE is bit 10.

	 */

	/* transactional execution */

	if (MACHINE_HAS_TE)

		elf_hwcap |= HWCAP_TE;



	/*

	 * Vector extension HWCAP_VXRS is bit 11. The Vector extension

	 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX

	 * instead of facility bit 129.

	 * Vector extension can be disabled with the "novx" parameter.

	 * Use MACHINE_HAS_VX instead of facility bit 129.

	 */

	if (MACHINE_HAS_VX) {

		elf_hwcap |= HWCAP_VXRS;
@@ -280,24 +239,24 @@ static int __init setup_hwcaps(void) 
		if (test_facility(192))

			elf_hwcap |= HWCAP_VXRS_PDE2;

	}



	if (test_facility(150))

		elf_hwcap |= HWCAP_SORT;



	if (test_facility(151))

		elf_hwcap |= HWCAP_DFLT;



	if (test_facility(165))

		elf_hwcap |= HWCAP_NNPA;



	/*

	 * Guarded storage support HWCAP_GS is bit 12.

	 */

	/* guarded storage */

	if (MACHINE_HAS_GS)

		elf_hwcap |= HWCAP_GS;



	if (MACHINE_HAS_PCI_MIO)

		elf_hwcap |= HWCAP_PCI_MIO;



	/*

	 * Virtualization support HWCAP_INT_SIE is bit 0.

	 */

	/* virtualization support */

	if (sclp.has_sief2)

		int_hwcap |= HWCAP_INT_SIE;