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arm64 fixes:

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- Do not return false if !preemptible() in current_in_efi(). EFI
    runtime services can now run with preemption enabled
 
  - Fix uninitialised variable in the arm MPAM driver, reported by sparse
 
  - Fix partial kasan_reset_tag() use in change_memory_common() when
    calculating page indices or comparing ranges
 
  - Save/restore TCR2_EL1 during suspend/resume, otherwise the E0POE bit
    is lost
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fixes from Catalin Marinas:

 - Do not return false if !preemptible() in current_in_efi(). EFI
   runtime services can now run with preemption enabled

 - Fix uninitialised variable in the arm MPAM driver, reported by sparse

 - Fix partial kasan_reset_tag() use in change_memory_common() when
   calculating page indices or comparing ranges

 - Save/restore TCR2_EL1 during suspend/resume, otherwise the E0POE bit
   is lost

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: Fix cleared E0POE bit after cpu_suspend()/resume()
  arm64: mm: Fix incomplete tag reset in change_memory_common()
  arm_mpam: Stop using uninitialized variables in __ris_msmon_read()
  arm64/efi: Don't fail check current_in_efi() if preemptible
This commit is contained in:
Linus Torvalds 2026-01-09 15:17:48 -10:00
commit e28ddd0b7a
5 changed files with 18 additions and 7 deletions
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2
arch/arm64/include/asm/efi.h
View File

@ -45,7 +45,7 @@ void arch_efi_call_virt_teardown(void);
* switching to the EFI runtime stack.
*/
#define current_in_efi() \
(!preemptible() && efi_rt_stack_top != NULL && \
(efi_rt_stack_top != NULL && \
on_task_stack(current, READ_ONCE(efi_rt_stack_top[-1]), 1))
#define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT)

2
arch/arm64/include/asm/suspend.h
View File

@ -2,7 +2,7 @@
#ifndef __ASM_SUSPEND_H
#define __ASM_SUSPEND_H
#define NR_CTX_REGS 13
#define NR_CTX_REGS 14
#define NR_CALLEE_SAVED_REGS 12
/*

6
arch/arm64/mm/pageattr.c
View File

@ -171,7 +171,8 @@ static int change_memory_common(unsigned long addr, int numpages,
*/
area = find_vm_area((void *)addr);
if (!area ||
end > (unsigned long)kasan_reset_tag(area->addr) + area->size ||
((unsigned long)kasan_reset_tag((void *)end) >
(unsigned long)kasan_reset_tag(area->addr) + area->size) ||
((area->flags & (VM_ALLOC | VM_ALLOW_HUGE_VMAP)) != VM_ALLOC))
return -EINVAL;
@ -184,7 +185,8 @@ static int change_memory_common(unsigned long addr, int numpages,
*/
if (rodata_full && (pgprot_val(set_mask) == PTE_RDONLY ||
pgprot_val(clear_mask) == PTE_RDONLY)) {
unsigned long idx = (start - (unsigned long)kasan_reset_tag(area->addr))
unsigned long idx = ((unsigned long)kasan_reset_tag((void *)start) -
(unsigned long)kasan_reset_tag(area->addr))
>> PAGE_SHIFT;
for (; numpages; idx++, numpages--) {
ret = __change_memory_common((u64)page_address(area->pages[idx]),

8
arch/arm64/mm/proc.S
View File

@ -110,6 +110,10 @@ SYM_FUNC_START(cpu_do_suspend)
* call stack.
*/
str x18, [x0, #96]
alternative_if ARM64_HAS_TCR2
mrs x2, REG_TCR2_EL1
str x2, [x0, #104]
alternative_else_nop_endif
ret
SYM_FUNC_END(cpu_do_suspend)
@ -144,6 +148,10 @@ SYM_FUNC_START(cpu_do_resume)
msr tcr_el1, x8
msr vbar_el1, x9
msr mdscr_el1, x10
alternative_if ARM64_HAS_TCR2
ldr x2, [x0, #104]
msr REG_TCR2_EL1, x2
alternative_else_nop_endif
msr sctlr_el1, x12
set_this_cpu_offset x13

7
drivers/resctrl/mpam_devices.c
View File

@ -1072,7 +1072,7 @@ static void __ris_msmon_read(void *arg)
u64 now;
bool nrdy = false;
bool config_mismatch;
bool overflow;
bool overflow = false;
struct mon_read *m = arg;
struct mon_cfg *ctx = m->ctx;
bool reset_on_next_read = false;
@ -1176,10 +1176,11 @@ static void __ris_msmon_read(void *arg)
}
mpam_mon_sel_unlock(msc);
if (nrdy) {
if (nrdy)
m->err = -EBUSY;
if (m->err)
return;
}
*m->val += now;
}