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arm64 fixes for -rc7

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- Fix false positive "sleeping while atomic" warning resulting from
   the kPTI rework taking a mutex too early.
 
 - Fix possible overflow in AMU frequency calculation
 
 - Fix incorrect shift in CMN PMU driver which causes problems with
   newer versions of the IP
 
 - Reduce alignment of the CFI jump table to avoid huge kernel images
   and link errors with !4KiB page size configurations
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fixes from Will Deacon:
 "These are all very simple and self-contained, although the CFI
  jump-table fix touches the generic linker script as that's where the
  problematic macro lives.

   - Fix false positive "sleeping while atomic" warning resulting from
     the kPTI rework taking a mutex too early.

   - Fix possible overflow in AMU frequency calculation

   - Fix incorrect shift in CMN PMU driver which causes problems with
     newer versions of the IP

   - Reduce alignment of the CFI jump table to avoid huge kernel images
     and link errors with !4KiB page size configurations"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  vmlinux.lds.h: CFI: Reduce alignment of jump-table to function alignment
  perf/arm-cmn: Add more bits to child node address offset field
  arm64: topology: fix possible overflow in amu_fie_setup()
  arm64: mm: don't acquire mutex when rewriting swapper
This commit is contained in:
Linus Torvalds 2022-09-23 15:28:51 -07:00
commit a63f2e7cb1
4 changed files with 21 additions and 18 deletions
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2
arch/arm64/kernel/topology.c
View File

@ -237,7 +237,7 @@ static void amu_fie_setup(const struct cpumask *cpus)
for_each_cpu(cpu, cpus) {
if (!freq_counters_valid(cpu) ||
freq_inv_set_max_ratio(cpu,
cpufreq_get_hw_max_freq(cpu) * 1000,
cpufreq_get_hw_max_freq(cpu) * 1000ULL,
arch_timer_get_rate()))
return;
}

32
arch/arm64/mm/mmu.c
View File

@ -331,12 +331,6 @@ static void alloc_init_pud(pgd_t *pgdp, unsigned long addr, unsigned long end,
}
BUG_ON(p4d_bad(p4d));
/*
* No need for locking during early boot. And it doesn't work as
* expected with KASLR enabled.
*/
if (system_state != SYSTEM_BOOTING)
mutex_lock(&fixmap_lock);
pudp = pud_set_fixmap_offset(p4dp, addr);
do {
pud_t old_pud = READ_ONCE(*pudp);
@ -368,15 +362,13 @@ static void alloc_init_pud(pgd_t *pgdp, unsigned long addr, unsigned long end,
} while (pudp++, addr = next, addr != end);
pud_clear_fixmap();
if (system_state != SYSTEM_BOOTING)
mutex_unlock(&fixmap_lock);
}
static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys,
unsigned long virt, phys_addr_t size,
pgprot_t prot,
phys_addr_t (*pgtable_alloc)(int),
int flags)
static void __create_pgd_mapping_locked(pgd_t *pgdir, phys_addr_t phys,
unsigned long virt, phys_addr_t size,
pgprot_t prot,
phys_addr_t (*pgtable_alloc)(int),
int flags)
{
unsigned long addr, end, next;
pgd_t *pgdp = pgd_offset_pgd(pgdir, virt);
@ -400,8 +392,20 @@ static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys,
} while (pgdp++, addr = next, addr != end);
}
static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys,
unsigned long virt, phys_addr_t size,
pgprot_t prot,
phys_addr_t (*pgtable_alloc)(int),
int flags)
{
mutex_lock(&fixmap_lock);
__create_pgd_mapping_locked(pgdir, phys, virt, size, prot,
pgtable_alloc, flags);
mutex_unlock(&fixmap_lock);
}
#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
extern __alias(__create_pgd_mapping)
extern __alias(__create_pgd_mapping_locked)
void create_kpti_ng_temp_pgd(pgd_t *pgdir, phys_addr_t phys, unsigned long virt,
phys_addr_t size, pgprot_t prot,
phys_addr_t (*pgtable_alloc)(int), int flags);

2
drivers/perf/arm-cmn.c
View File

@ -36,7 +36,7 @@
#define CMN_CI_CHILD_COUNT GENMASK_ULL(15, 0)
#define CMN_CI_CHILD_PTR_OFFSET GENMASK_ULL(31, 16)
#define CMN_CHILD_NODE_ADDR GENMASK(27, 0)
#define CMN_CHILD_NODE_ADDR GENMASK(29, 0)
#define CMN_CHILD_NODE_EXTERNAL BIT(31)
#define CMN_MAX_DIMENSION 12

3
include/asm-generic/vmlinux.lds.h
View File

@ -543,10 +543,9 @@
*/
#ifdef CONFIG_CFI_CLANG
#define TEXT_CFI_JT \
. = ALIGN(PMD_SIZE); \
ALIGN_FUNCTION(); \
__cfi_jt_start = .; \
*(.text..L.cfi.jumptable .text..L.cfi.jumptable.*) \
. = ALIGN(PMD_SIZE); \
__cfi_jt_end = .;
#else
#define TEXT_CFI_JT