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Merge branch 'parisc-5.2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux 

Pull more parisc updates from Helge Deller:
 "Two small enhancements, which I didn't included in the last pull
  request because I wanted to keep them a few more days in for-next
  before sending upstream:

   - Replace the ldcw barrier instruction by a nop instruction in the
     CAS code on uniprocessor machines.

   - Map variables read-only after init (enable ro_after_init feature)"

* 'parisc-5.2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc: Use __ro_after_init in init.c
  parisc: Use __ro_after_init in unwind.c
  parisc: Use __ro_after_init in time.c
  parisc: Use __ro_after_init in processor.c
  parisc: Use __ro_after_init in process.c
  parisc: Use __ro_after_init in perf_images.h
  parisc: Use __ro_after_init in pci.c
  parisc: Use __ro_after_init in inventory.c
  parisc: Use __ro_after_init in head.S
  parisc: Use __ro_after_init in firmware.c
  parisc: Use __ro_after_init in drivers.c
  parisc: Use __ro_after_init in cache.c
  parisc: Enable the ro_after_init feature
  parisc: Drop LDCW barrier in CAS code when running UP
This commit is contained in:
Linus Torvalds 2019-05-14 13:17:19 -07:00
parent ca4b40629f 4e617c86ba
commit b2c9112821
15 changed files with 72 additions and 71 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/parisc/include/asm/cache.h
View File

@ -24,9 +24,6 @@
#define __read_mostly __attribute__((__section__(".data..read_mostly")))
/* Read-only memory is marked before mark_rodata_ro() is called. */
#define __ro_after_init __read_mostly
void parisc_cache_init(void); /* initializes cache-flushing */
void disable_sr_hashing_asm(int); /* low level support for above */
void disable_sr_hashing(void); /* turns off space register hashing */

16
arch/parisc/kernel/cache.c
View File

@ -29,9 +29,9 @@
#include <asm/sections.h>
#include <asm/shmparam.h>
int split_tlb __read_mostly;
int dcache_stride __read_mostly;
int icache_stride __read_mostly;
int split_tlb __ro_after_init;
int dcache_stride __ro_after_init;
int icache_stride __ro_after_init;
EXPORT_SYMBOL(dcache_stride);
void flush_dcache_page_asm(unsigned long phys_addr, unsigned long vaddr);
@ -51,12 +51,12 @@ DEFINE_SPINLOCK(pa_tlb_flush_lock);
DEFINE_SPINLOCK(pa_swapper_pg_lock);
#if defined(CONFIG_64BIT) && defined(CONFIG_SMP)
int pa_serialize_tlb_flushes __read_mostly;
int pa_serialize_tlb_flushes __ro_after_init;
#endif
struct pdc_cache_info cache_info __read_mostly;
struct pdc_cache_info cache_info __ro_after_init;
#ifndef CONFIG_PA20
static struct pdc_btlb_info btlb_info __read_mostly;
static struct pdc_btlb_info btlb_info __ro_after_init;
#endif
#ifdef CONFIG_SMP
@ -381,10 +381,10 @@ EXPORT_SYMBOL(flush_data_cache_local);
EXPORT_SYMBOL(flush_kernel_icache_range_asm);
#define FLUSH_THRESHOLD 0x80000 /* 0.5MB */
static unsigned long parisc_cache_flush_threshold __read_mostly = FLUSH_THRESHOLD;
static unsigned long parisc_cache_flush_threshold __ro_after_init = FLUSH_THRESHOLD;
#define FLUSH_TLB_THRESHOLD (16*1024) /* 16 KiB minimum TLB threshold */
static unsigned long parisc_tlb_flush_threshold __read_mostly = FLUSH_TLB_THRESHOLD;
static unsigned long parisc_tlb_flush_threshold __ro_after_init = FLUSH_TLB_THRESHOLD;
void __init parisc_setup_cache_timing(void)
{

2
arch/parisc/kernel/drivers.c
View File

@ -41,7 +41,7 @@
#include <asm/ropes.h>
/* See comments in include/asm-parisc/pci.h */
const struct dma_map_ops *hppa_dma_ops __read_mostly;
const struct dma_map_ops *hppa_dma_ops __ro_after_init;
EXPORT_SYMBOL(hppa_dma_ops);
static struct device root = {

2
arch/parisc/kernel/firmware.c
View File

@ -87,7 +87,7 @@ extern unsigned long pdc_result2[NUM_PDC_RESULT];
/* Firmware needs to be initially set to narrow to determine the
* actual firmware width. */
int parisc_narrow_firmware __read_mostly = 1;
int parisc_narrow_firmware __ro_after_init = 1;
#endif
/* On most currently-supported platforms, IODC I/O calls are 32-bit calls

2
arch/parisc/kernel/head.S
View File

@ -376,7 +376,7 @@ smp_slave_stext:
ENDPROC(parisc_kernel_start)
#ifndef CONFIG_64BIT
.section .data..read_mostly
.section .data..ro_after_init
.align 4
.export $global$,data

8
arch/parisc/kernel/inventory.c
View File

@ -39,12 +39,12 @@
*/
#undef DEBUG_PAT
int pdc_type __read_mostly = PDC_TYPE_ILLEGAL;
int pdc_type __ro_after_init = PDC_TYPE_ILLEGAL;
/* cell number and location (PAT firmware only) */
unsigned long parisc_cell_num __read_mostly;
unsigned long parisc_cell_loc __read_mostly;
unsigned long parisc_pat_pdc_cap __read_mostly;
unsigned long parisc_cell_num __ro_after_init;
unsigned long parisc_cell_loc __ro_after_init;
unsigned long parisc_pat_pdc_cap __ro_after_init;
void __init setup_pdc(void)

8
arch/parisc/kernel/pci.c
View File

@ -45,14 +45,14 @@
* #define pci_post_reset_delay 50
*/
struct pci_port_ops *pci_port __read_mostly;
struct pci_bios_ops *pci_bios __read_mostly;
struct pci_port_ops *pci_port __ro_after_init;
struct pci_bios_ops *pci_bios __ro_after_init;
static int pci_hba_count __read_mostly;
static int pci_hba_count __ro_after_init;
/* parisc_pci_hba used by pci_port->in/out() ops to lookup bus data. */
#define PCI_HBA_MAX 32
static struct pci_hba_data *parisc_pci_hba[PCI_HBA_MAX] __read_mostly;
static struct pci_hba_data *parisc_pci_hba[PCI_HBA_MAX] __ro_after_init;
/********************************************************************

4
arch/parisc/kernel/perf_images.h
View File

@ -25,7 +25,7 @@
#define PCXU_IMAGE_SIZE 584
static uint32_t onyx_images[][PCXU_IMAGE_SIZE/sizeof(uint32_t)] __read_mostly = {
static uint32_t onyx_images[][PCXU_IMAGE_SIZE/sizeof(uint32_t)] __ro_after_init = {
/*
* CPI:
*
@ -2093,7 +2093,7 @@ static uint32_t onyx_images[][PCXU_IMAGE_SIZE/sizeof(uint32_t)] __read_mostly =
};
#define PCXW_IMAGE_SIZE 576
static uint32_t cuda_images[][PCXW_IMAGE_SIZE/sizeof(uint32_t)] __read_mostly = {
static uint32_t cuda_images[][PCXW_IMAGE_SIZE/sizeof(uint32_t)] __ro_after_init = {
/*
* CPI: FROM CPI.IDF (Image 0)
*

2
arch/parisc/kernel/process.c
View File

@ -192,7 +192,7 @@ int dump_task_fpu (struct task_struct *tsk, elf_fpregset_t *r)
* QEMU idle the host too.
*/
int running_on_qemu __read_mostly;
int running_on_qemu __ro_after_init;
EXPORT_SYMBOL(running_on_qemu);
void __cpuidle arch_cpu_idle_dead(void)

4
arch/parisc/kernel/processor.c
View File

@ -43,10 +43,10 @@
#include <asm/irq.h> /* for struct irq_region */
#include <asm/parisc-device.h>
struct system_cpuinfo_parisc boot_cpu_data __read_mostly;
struct system_cpuinfo_parisc boot_cpu_data __ro_after_init;
EXPORT_SYMBOL(boot_cpu_data);
#ifdef CONFIG_PA8X00
int _parisc_requires_coherency __read_mostly;
int _parisc_requires_coherency __ro_after_init;
EXPORT_SYMBOL(_parisc_requires_coherency);
#endif

12
arch/parisc/kernel/syscall.S
View File

@ -641,7 +641,8 @@ cas_action:
2: stw %r24, 0(%r26)
/* Free lock */
#ifdef CONFIG_SMP
LDCW 0(%sr2,%r20), %r1 /* Barrier */
98: LDCW 0(%sr2,%r20), %r1 /* Barrier */
99: ALTERNATIVE(98b, 99b, ALT_COND_NO_SMP, INSN_NOP)
#endif
stw %r20, 0(%sr2,%r20)
#if ENABLE_LWS_DEBUG
@ -658,7 +659,8 @@ cas_action:
/* Error occurred on load or store */
/* Free lock */
#ifdef CONFIG_SMP
LDCW 0(%sr2,%r20), %r1 /* Barrier */
98: LDCW 0(%sr2,%r20), %r1 /* Barrier */
99: ALTERNATIVE(98b, 99b, ALT_COND_NO_SMP, INSN_NOP)
#endif
stw %r20, 0(%sr2,%r20)
#if ENABLE_LWS_DEBUG
@ -862,7 +864,8 @@ cas2_action:
cas2_end:
/* Free lock */
#ifdef CONFIG_SMP
LDCW 0(%sr2,%r20), %r1 /* Barrier */
98: LDCW 0(%sr2,%r20), %r1 /* Barrier */
99: ALTERNATIVE(98b, 99b, ALT_COND_NO_SMP, INSN_NOP)
#endif
stw %r20, 0(%sr2,%r20)
/* Enable interrupts */
@ -875,7 +878,8 @@ cas2_end:
/* Error occurred on load or store */
/* Free lock */
#ifdef CONFIG_SMP
LDCW 0(%sr2,%r20), %r1 /* Barrier */
98: LDCW 0(%sr2,%r20), %r1 /* Barrier */
99: ALTERNATIVE(98b, 99b, ALT_COND_NO_SMP, INSN_NOP)
#endif
stw %r20, 0(%sr2,%r20)
ssm PSW_SM_I, %r0

2
arch/parisc/kernel/time.c
View File

@ -40,7 +40,7 @@
#include <linux/timex.h>
static unsigned long clocktick __read_mostly; /* timer cycles per tick */
static unsigned long clocktick __ro_after_init; /* timer cycles per tick */
/*
* We keep time on PA-RISC Linux by using the Interval Timer which is

2
arch/parisc/kernel/unwind.c
View File

@ -40,7 +40,7 @@ static DEFINE_SPINLOCK(unwind_lock);
* we can call unwind_init as early in the bootup process as
* possible (before the slab allocator is initialized)
*/
static struct unwind_table kernel_unwind_table __read_mostly;
static struct unwind_table kernel_unwind_table __ro_after_init;
static LIST_HEAD(unwind_tables);
static inline const struct unwind_table_entry *

3
arch/parisc/kernel/vmlinux.lds.S
View File

@ -18,9 +18,6 @@
*(.data..vm0.pgd) \
*(.data..vm0.pte)
/* No __ro_after_init data in the .rodata section - which will always be ro */
#define RO_AFTER_INIT_DATA
#include <asm-generic/vmlinux.lds.h>
/* needed for the processor specific cache alignment size */

73
arch/parisc/mm/init.c
View File

@ -66,7 +66,7 @@ static struct resource pdcdata_resource = {
.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
};
static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __read_mostly;
static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __ro_after_init;
/* The following array is initialized from the firmware specific
* information retrieved in kernel/inventory.c.
@ -345,16 +345,7 @@ static void __init setup_bootmem(void)
memblock_dump_all();
}
static int __init parisc_text_address(unsigned long vaddr)
{
static unsigned long head_ptr __initdata;
if (!head_ptr)
head_ptr = PAGE_MASK & (unsigned long)
dereference_function_descriptor(&parisc_kernel_start);
return core_kernel_text(vaddr) || vaddr == head_ptr;
}
static bool kernel_set_to_readonly;
static void __init map_pages(unsigned long start_vaddr,
unsigned long start_paddr, unsigned long size,
@ -372,10 +363,11 @@ static void __init map_pages(unsigned long start_vaddr,
unsigned long vaddr;
unsigned long ro_start;
unsigned long ro_end;
unsigned long kernel_end;
unsigned long kernel_start, kernel_end;
ro_start = __pa((unsigned long)_text);
ro_end = __pa((unsigned long)&data_start);
kernel_start = __pa((unsigned long)&__init_begin);
kernel_end = __pa((unsigned long)&_end);
end_paddr = start_paddr + size;
@ -438,26 +430,30 @@ static void __init map_pages(unsigned long start_vaddr,
pg_table = (pte_t *) __va(pg_table) + start_pte;
for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++, pg_table++) {
pte_t pte;
pgprot_t prot;
bool huge = false;
if (force)
pte = __mk_pte(address, pgprot);
else if (parisc_text_address(vaddr)) {
pte = __mk_pte(address, PAGE_KERNEL_EXEC);
if (address >= ro_start && address < kernel_end)
pte = pte_mkhuge(pte);
if (force) {
prot = pgprot;
} else if (address < kernel_start || address >= kernel_end) {
/* outside kernel memory */
prot = PAGE_KERNEL;
} else if (!kernel_set_to_readonly) {
/* still initializing, allow writing to RO memory */
prot = PAGE_KERNEL_RWX;
huge = true;
} else if (address >= ro_start) {
/* Code (ro) and Data areas */
prot = (address < ro_end) ?
PAGE_KERNEL_EXEC : PAGE_KERNEL;
huge = true;
} else {
prot = PAGE_KERNEL;
}
else
#if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
if (address >= ro_start && address < ro_end) {
pte = __mk_pte(address, PAGE_KERNEL_EXEC);
pte = __mk_pte(address, prot);
if (huge)
pte = pte_mkhuge(pte);
} else
#endif
{
pte = __mk_pte(address, pgprot);
if (address >= ro_start && address < kernel_end)
pte = pte_mkhuge(pte);
}
if (address >= end_paddr)
break;
@ -493,6 +489,12 @@ void __ref free_initmem(void)
{
unsigned long init_begin = (unsigned long)__init_begin;
unsigned long init_end = (unsigned long)__init_end;
unsigned long kernel_end = (unsigned long)&_end;
/* Remap kernel text and data, but do not touch init section yet. */
kernel_set_to_readonly = true;
map_pages(init_end, __pa(init_end), kernel_end - init_end,
PAGE_KERNEL, 0);
/* The init text pages are marked R-X. We have to
* flush the icache and mark them RW-
@ -509,7 +511,7 @@ void __ref free_initmem(void)
PAGE_KERNEL, 1);
/* force the kernel to see the new TLB entries */
__flush_tlb_range(0, init_begin, init_end);
__flush_tlb_range(0, init_begin, kernel_end);
/* finally dump all the instructions which were cached, since the
* pages are no-longer executable */
@ -527,8 +529,9 @@ void mark_rodata_ro(void)
{
/* rodata memory was already mapped with KERNEL_RO access rights by
pagetable_init() and map_pages(). No need to do additional stuff here */
printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n",
(unsigned long)(__end_rodata - __start_rodata) >> 10);
unsigned long roai_size = __end_ro_after_init - __start_ro_after_init;
pr_info("Write protected read-only-after-init data: %luk\n", roai_size >> 10);
}
#endif
@ -554,11 +557,11 @@ void mark_rodata_ro(void)
#define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
& ~(VM_MAP_OFFSET-1)))
void *parisc_vmalloc_start __read_mostly;
void *parisc_vmalloc_start __ro_after_init;
EXPORT_SYMBOL(parisc_vmalloc_start);
#ifdef CONFIG_PA11
unsigned long pcxl_dma_start __read_mostly;
unsigned long pcxl_dma_start __ro_after_init;
#endif
void __init mem_init(void)
@ -632,7 +635,7 @@ void __init mem_init(void)
#endif
}
unsigned long *empty_zero_page __read_mostly;
unsigned long *empty_zero_page __ro_after_init;
EXPORT_SYMBOL(empty_zero_page);
/*