diff options
| author | Yosry Ahmed <yosryahmed@google.com> | 2024-07-02 15:21:39 +0200 |
|---|---|---|
| committer | Dave Hansen <dave.hansen@linux.intel.com> | 2024-07-02 20:33:44 +0200 |
| commit | b7c35279e0da414e7d90eba76f58a16223a734cb (patch) | |
| tree | 5e8fb9ddb04b7b1c349b3d41f5881cbbd0b001d6 /arch/x86/kernel | |
| parent | x86/mm: Fix LAM inconsistency during context switch (diff) | |
| download | linux-b7c35279e0da414e7d90eba76f58a16223a734cb.tar.xz linux-b7c35279e0da414e7d90eba76f58a16223a734cb.zip | |
x86/mm: Cleanup prctl_enable_tagged_addr() nr_bits error checking
There are two separate checks in prctl_enable_tagged_addr() that nr_bits
is in the correct range. The checks are arranged such the correct case
is sandwiched between both error cases, which do exactly the same thing.
Simplify the if condition and pull the correct case outside with the
rest of the success code path.
Signed-off-by: Yosry Ahmed <yosryahmed@google.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Link: https://lore.kernel.org/all/20240702132139.3332013-4-yosryahmed%40google.com
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/process_64.c | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index e9f7cfdb9420..226472332a70 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -812,6 +812,9 @@ static void enable_lam_func(void *__mm) static void mm_enable_lam(struct mm_struct *mm) { + mm->context.lam_cr3_mask = X86_CR3_LAM_U57; + mm->context.untag_mask = ~GENMASK(62, 57); + /* * Even though the process must still be single-threaded at this * point, kernel threads may be using the mm. IPI those kernel @@ -846,13 +849,7 @@ static int prctl_enable_tagged_addr(struct mm_struct *mm, unsigned long nr_bits) return -EBUSY; } - if (!nr_bits) { - mmap_write_unlock(mm); - return -EINVAL; - } else if (nr_bits <= LAM_U57_BITS) { - mm->context.lam_cr3_mask = X86_CR3_LAM_U57; - mm->context.untag_mask = ~GENMASK(62, 57); - } else { + if (!nr_bits || nr_bits > LAM_U57_BITS) { mmap_write_unlock(mm); return -EINVAL; } |