diff options
| author | Michael Ellerman <mpe@ellerman.id.au> | 2023-10-25 04:24:52 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2023-11-27 14:01:14 +0300 |
| commit | 98eb30fe4c69a9b602f29e406317c49b5580352a (patch) | |
| tree | f0329c322c988c7f6d8432404fb821d72d7382ce /arch/powerpc/kernel | |
| parent | 183bc0c640c785a710885a10b614193f114fe760 (diff) | |
| download | linux-98eb30fe4c69a9b602f29e406317c49b5580352a.tar.xz | |
powerpc: Make cpu_spec __ro_after_init
The cpu_spec is a struct holding various information about the CPU the
kernel is executing on. It's populated early in boot and must not change
after that.
In particular the cpu_features and mmu_features hold the set of
discovered CPU/MMU features and are used to set static keys for each
feature, and do binary patching of assembly. So any change to the
cpu_features/mmu_features later in boot will not be reflected in
the state of the static keys or patched code.
There is already logic to check that cpu_features/mmu_features don't
change, see check_features() in feature-fixups.c.
But as another layer of protection the entire cpu_spec should be read
only after init, annotate it as such.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231025012452.1985680-1-mpe@ellerman.id.au
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/cputable.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/cputable.c b/arch/powerpc/kernel/cputable.c index e97a0fd0ae90..6f6801da9dc1 100644 --- a/arch/powerpc/kernel/cputable.c +++ b/arch/powerpc/kernel/cputable.c @@ -20,9 +20,9 @@ #include <asm/setup.h> #include <asm/cpu_setup.h> -static struct cpu_spec the_cpu_spec __read_mostly; +static struct cpu_spec the_cpu_spec __ro_after_init; -struct cpu_spec* cur_cpu_spec __read_mostly = NULL; +struct cpu_spec *cur_cpu_spec __ro_after_init = NULL; EXPORT_SYMBOL(cur_cpu_spec); /* The platform string corresponding to the real PVR */ |