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Merge branch 'fixes' of git://git.armlinux.org.uk/~rmk/linux-arm 

Pull ARM fixes from Russell King:
 "A couple of small fixes this time around from Steven for an
  interaction between ftrace and kernel read-only protection, and
  Vladimir for nommu"

* 'fixes' of git://git.armlinux.org.uk/~rmk/linux-arm:
  ARM: 8780/1: ftrace: Only set kernel memory back to read-only after boot
  ARM: 8775/1: NOMMU: Use instr_sync instead of plain isb in common code
This commit is contained in:
Linus Torvalds 2018-07-13 11:44:12 -07:00
parent 35a84f34cf b4c7e2bd2e
commit e6ef760731
2 changed files with 10 additions and 1 deletions
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2
arch/arm/kernel/head-nommu.S
View File

@ -177,7 +177,7 @@ M_CLASS(streq r3, [r12, #PMSAv8_MAIR1])
bic r0, r0, #CR_I
#endif
mcr p15, 0, r0, c1, c0, 0 @ write control reg
isb
instr_sync
#elif defined (CONFIG_CPU_V7M)
#ifdef CONFIG_ARM_MPU
ldreq r3, [r12, MPU_CTRL]

9
arch/arm/mm/init.c
View File

@ -736,20 +736,29 @@ static int __mark_rodata_ro(void *unused)
return 0;
}
static int kernel_set_to_readonly __read_mostly;
void mark_rodata_ro(void)
{
kernel_set_to_readonly = 1;
stop_machine(__mark_rodata_ro, NULL, NULL);
debug_checkwx();
}
void set_kernel_text_rw(void)
{
if (!kernel_set_to_readonly)
return;
set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), false,
current->active_mm);
}
void set_kernel_text_ro(void)
{
if (!kernel_set_to_readonly)
return;
set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), true,
current->active_mm);
}