| Message ID | 20230929211155.3910949-5-samitolvanen@google.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | riscv: Increase mmap_rnd_bits_max on Sv48/57 | expand |
On Fri, Sep 29, 2023 at 09:11:57PM +0000, Sami Tolvanen wrote: > Allow mmap_rnd_bits_max to be updated on architectures that > determine virtual address space size at runtime instead of relying > on Kconfig options by changing it from const to __ro_after_init. > > Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Just the kind of thing __ro_after_init was made for. :) Reviewed-by: Kees Cook <keescook@chromium.org>
diff --git a/include/linux/mm.h b/include/linux/mm.h index bf5d0b1b16f4..72a98b2afaf9 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -86,7 +86,7 @@ extern int sysctl_legacy_va_layout; #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS extern const int mmap_rnd_bits_min; -extern const int mmap_rnd_bits_max; +extern int mmap_rnd_bits_max __ro_after_init; extern int mmap_rnd_bits __read_mostly; #endif #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS diff --git a/mm/mmap.c b/mm/mmap.c index b56a7f0c9f85..ed1b178b223a 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -64,7 +64,7 @@ #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS const int mmap_rnd_bits_min = CONFIG_ARCH_MMAP_RND_BITS_MIN; -const int mmap_rnd_bits_max = CONFIG_ARCH_MMAP_RND_BITS_MAX; +int mmap_rnd_bits_max __ro_after_init = CONFIG_ARCH_MMAP_RND_BITS_MAX; int mmap_rnd_bits __read_mostly = CONFIG_ARCH_MMAP_RND_BITS; #endif #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
Allow mmap_rnd_bits_max to be updated on architectures that determine virtual address space size at runtime instead of relying on Kconfig options by changing it from const to __ro_after_init. Signed-off-by: Sami Tolvanen <samitolvanen@google.com> --- include/linux/mm.h | 2 +- mm/mmap.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)